Abstract

We demonstrate experimentally the delay of squeezed light and entanglement using Electromagnetically Induced Transparency (EIT) in a rubidium vapour cell. We perform quadrature amplitude measurements of the probe field and find no appreciable excess noise from the EIT process. From input squeezing of 3.2±0.5 dB at low sideband frequencies, we observed the survival of 2.0±0.5 dB of squeezing at the EIT output. By splitting the squeezed light on a beam-splitter, we generated biased entanglement between two beams. We transmit one of the entangled beams through the EIT cell and correlate the quantum statistics of this beam with its entangled counterpart. We experimentally observed a 2.2±0.5µs delay of the biased entanglement and obtained a preserved degree of wavefunction inseparability of 0.71±0.01, below the unity value for separable states.

© 2008 Optical Society of America

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    [CrossRef] [PubMed]

2008 (3)

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

2007 (4)

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

2006 (4)

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

E. Figueroa, F. Vewinger, J. Appel, and A. I. Lvovsky, "Decoherence of electromagnetically induced transparency in atomic vapor," Opt. Lett. 31, 2625 (2006).
[CrossRef] [PubMed]

T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
[CrossRef] [PubMed]

2005 (3)

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

M. D. Eisaman, A. Andr�??e, F. Massou, M. Fleischhauer, A. S. Zibrov, and M. D. Lukin, "Electromagnetically induced transparency with tunable single-photon pulses," Nature 438, 837 (2005).
[CrossRef] [PubMed]

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

2004 (5)

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

2003 (2)

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

W. P. Bowen, P. K. Lam, and T. C. Ralph, "Biased EPR entanglement and its application to teleportation," J. Mod. Opt. 50, 801 (2003).

2002 (1)

C. Schori, J. Sørensen, and E. S. Polzik, "Narrow-band frequency tunable light source of continuous quadrature entanglement," Phys. Rev. A 66, 033802 (2002).
[CrossRef]

2001 (4)

C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
[CrossRef] [PubMed]

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

E. Knill, R. Laflamme, and G. J. Milburn,"A scheme for efficient quantum computation with linear optics," Nature 409, 46 (2001).
[CrossRef] [PubMed]

2000 (3)

M. Fleischhauer and M. D. Lukin, "Dark-State Polaritons in electromagnetically induced transparency," Phys. Rev. Lett. 84, 5094 (2000).
[CrossRef] [PubMed]

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

R. Simon, "Peres-Horodecki separability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2726 (2000).
[CrossRef] [PubMed]

1999 (1)

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
[CrossRef]

1992 (1)

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

1988 (1)

M. D. Reid and P. D. Drummond, "Quantum correlations of phase in nondegenerate parametric oscillation," Phys. Rev. Lett. 60, 2731-2733 (1988).
[CrossRef] [PubMed]

Afzelius, M.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

Akamatsu, D.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
[CrossRef] [PubMed]

Akiba, K.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

Appel, J.

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

E. Figueroa, F. Vewinger, J. Appel, and A. I. Lvovsky, "Decoherence of electromagnetically induced transparency in atomic vapor," Opt. Lett. 31, 2625 (2006).
[CrossRef] [PubMed]

Arikawa, M.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

Bachor, H.-A.

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

Bachor,, H.-A.

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Behroozi, C. H.

C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
[CrossRef] [PubMed]

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
[CrossRef]

Bowen, W. P.

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

W. P. Bowen, P. K. Lam, and T. C. Ralph, "Biased EPR entanglement and its application to teleportation," J. Mod. Opt. 50, 801 (2003).

Buchler, B. C

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

Buchler,, B. C.

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Chaneliere, T.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Chelkowski, S.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

Cirac, J. I.

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

Coudreau, T.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

Danzmann, K.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

de Riedmatten, H.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
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Drummond, P. D.

M. D. Reid and P. D. Drummond, "Quantum correlations of phase in nondegenerate parametric oscillation," Phys. Rev. Lett. 60, 2731-2733 (1988).
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Duan, L. M.

L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

Dutton, Z.

C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
[CrossRef] [PubMed]

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
[CrossRef]

Eisaman, M. D.

M. D. Eisaman, A. Andr�??e, F. Massou, M. Fleischhauer, A. S. Zibrov, and M. D. Lukin, "Electromagnetically induced transparency with tunable single-photon pulses," Nature 438, 837 (2005).
[CrossRef] [PubMed]

Fabre, C.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

Figueroa, E.

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

E. Figueroa, F. Vewinger, J. Appel, and A. I. Lvovsky, "Decoherence of electromagnetically induced transparency in atomic vapor," Opt. Lett. 31, 2625 (2006).
[CrossRef] [PubMed]

Fiurasek, J.

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

Fleischhauer, A.

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

Fleischhauer, M.

M. Fleischhauer and M. D. Lukin, "Dark-State Polaritons in electromagnetically induced transparency," Phys. Rev. Lett. 84, 5094 (2000).
[CrossRef] [PubMed]

Franzen, A.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

Furusawa, A.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
[CrossRef] [PubMed]

Giedke, G.

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

Gisin, N.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

Gl¨ockl, O.

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Goda, K.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

Gray, M. B.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Grosse, N.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

H???etet, G.

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Hage, B.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

Harb, , C. C.

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

Harris, S. E.

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
[CrossRef]

Hau, L. V.

C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
[CrossRef] [PubMed]

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
[CrossRef]

Honda, K.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

Hope, J. J

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

Hope, J. J.

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

Hsu, M. T. L.

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Jenkins, S. D.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Johnsson, M.

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

Johnsson, M. T.

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

Julsgaard, B.

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

Keller, G.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

Kennedy, T. A. B.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Kimble, H. J.

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

Knill, E.

E. Knill, R. Laflamme, and G. J. Milburn,"A scheme for efficient quantum computation with linear optics," Nature 409, 46 (2001).
[CrossRef] [PubMed]

Korystov, D.

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

Kozuma, M.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
[CrossRef] [PubMed]

Kuzmich, A.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Laflamme, R.

E. Knill, R. Laflamme, and G. J. Milburn,"A scheme for efficient quantum computation with linear optics," Nature 409, 46 (2001).
[CrossRef] [PubMed]

Lam, K

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

Lam, P. K

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

Lam, P. K.

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

W. P. Bowen, P. K. Lam, and T. C. Ralph, "Biased EPR entanglement and its application to teleportation," J. Mod. Opt. 50, 801 (2003).

Lan, S.-Y.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Laurat, J.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

Liu, C.

C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
[CrossRef] [PubMed]

Lobino, M.

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

Longdell, J. J.

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

Lukin, M. D.

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

M. Fleischhauer and M. D. Lukin, "Dark-State Polaritons in electromagnetically induced transparency," Phys. Rev. Lett. 84, 5094 (2000).
[CrossRef] [PubMed]

Lvovsky, A. I.

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

E. Figueroa, F. Vewinger, J. Appel, and A. I. Lvovsky, "Decoherence of electromagnetically induced transparency in atomic vapor," Opt. Lett. 31, 2625 (2006).
[CrossRef] [PubMed]

Mair, A.

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

Matsukevich, D. N.

T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Mavalvala, N.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

McClelland, D. E

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

McClelland, D. E.

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

McKenzie, K.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Mikhailov, E. E.

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

Milburn, G. J.

E. Knill, R. Laflamme, and G. J. Milburn,"A scheme for efficient quantum computation with linear optics," Nature 409, 46 (2001).
[CrossRef] [PubMed]

Nagatsuka, S.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
[CrossRef] [PubMed]

Ou, Z. Y.

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

Peng, A

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

Peng, A.

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

Peng, K. C.

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

Pereira, S. F.

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

Phillips, D. F.

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

Pilypas, , K. A

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

Polzik, E. S.

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

C. Schori, J. Sørensen, and E. S. Polzik, "Narrow-band frequency tunable light source of continuous quadrature entanglement," Phys. Rev. A 66, 033802 (2002).
[CrossRef]

Ralph, T. C.

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

W. P. Bowen, P. K. Lam, and T. C. Ralph, "Biased EPR entanglement and its application to teleportation," J. Mod. Opt. 50, 801 (2003).

Reid, M. D.

M. D. Reid and P. D. Drummond, "Quantum correlations of phase in nondegenerate parametric oscillation," Phys. Rev. Lett. 60, 2731-2733 (1988).
[CrossRef] [PubMed]

Sangouard, N.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

Schnabel, R.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

Schori, C.

C. Schori, J. Sørensen, and E. S. Polzik, "Narrow-band frequency tunable light source of continuous quadrature entanglement," Phys. Rev. A 66, 033802 (2002).
[CrossRef]

Sherson, J.

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

Simon, C.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

Simon, R.

R. Simon, "Peres-Horodecki separability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2726 (2000).
[CrossRef] [PubMed]

Sørensen, J.

C. Schori, J. Sørensen, and E. S. Polzik, "Narrow-band frequency tunable light source of continuous quadrature entanglement," Phys. Rev. A 66, 033802 (2002).
[CrossRef]

Tanimura, T.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
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Treps, N.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

Vahlbruch, H.

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

Vewinger, F.

Walsworth, R. L.

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

Whitcomb, S. E.

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Yokoi, Y.

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

M. Arikawa, K. Honda, D. Akamatsu, Y. Yokoi, K. Akiba, S. Nagatsuka, A. Furusawa, and M. Kozuma, "Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method," Opt. Express 15, 11849 (2007).
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T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, "Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4," Opt. Lett. 31, 2344, (2006)
[CrossRef] [PubMed]

Zbinden, H.

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

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L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

J. Mod. Opt. (1)

W. P. Bowen, P. K. Lam, and T. C. Ralph, "Biased EPR entanglement and its application to teleportation," J. Mod. Opt. 50, 801 (2003).

J. Opt. B: Quantum Semiclass. Opt. (1)

K. McKenzie, E. E. Mikhailov, K. Goda, P. K. Lam, N. Grosse, M. B. Gray, N. Mavalvala, and D. E McClelland, "Quantum noise locking," J. Opt. B: Quantum Semiclass. Opt. 7, S421(2005).
[CrossRef]

Mol. Opt. Phys. (1)

G. Hetet, O. Glockl, K. A . Pilypas, C. C. Harb, B. C . Buchler, H.-A. Bachor, and P. K . Lam, "Squeezed light for bandwidth limited atom optics experiments at the Rubidium D1 line," J. Phys. B At. Mol. Opt. Phys. 40, 221 (2007).
[CrossRef]

Nature (7)

B. Julsgaard, J. Sherson, J. I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature 432, 482 (2004).
[CrossRef] [PubMed]

L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, "Long-distance quantum communication with atomic ensembles and linear optics," Nature 414, 413 (2001).
[CrossRef] [PubMed]

E. Knill, R. Laflamme, and G. J. Milburn,"A scheme for efficient quantum computation with linear optics," Nature 409, 46 (2001).
[CrossRef] [PubMed]

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
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C. Liu, Z. Dutton, C. H. Behroozi, and L. V. Hau, "Observation of coherent optical information storage in an atomic medium using halted light pulses," Nature 409, 490 (2001).
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M. D. Eisaman, A. Andr�??e, F. Massou, M. Fleischhauer, A. S. Zibrov, and M. D. Lukin, "Electromagnetically induced transparency with tunable single-photon pulses," Nature 438, 837 (2005).
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T. Chaneliere, D. N. Matsukevich, S. D. Jenkins, S.-Y. Lan, T. A. B. Kennedy, and A. Kuzmich, "Storage and retrieval of single photons transmitted between remote quantum memories," Nature 438, 833 (2005).
[CrossRef] [PubMed]

Opt. Express (1)

Opt. Lett. (2)

Phys. Rev. A (5)

A. Peng, M. Johnsson, W. P. Bowen, P. K. Lam, H.-A. Bachor, and J. J. Hope, "Squeezing and entanglement delay using slow light," Phys. Rev. A 71, 033809 (2004).
[CrossRef]

C. Schori, J. Sørensen, and E. S. Polzik, "Narrow-band frequency tunable light source of continuous quadrature entanglement," Phys. Rev. A 66, 033802 (2002).
[CrossRef]

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Compact source of Einstein-Podolsky-Rosen entanglement and squeezing at very low noise frequencies," Phys. Rev. A 70, 042315 (2004).
[CrossRef]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental characterization of continuous-variable entanglement," Phys. Rev. A 69, 012304 (2004).
[CrossRef]

G. Hetet, A . Peng, M. T. Johnsson, J. J . Hope, and P. K . Lam, "Characterization of electromagnetically-inducedtransparency-based continuous-variable quantum memories," Phys. Rev. A,  77, 012323 (2008).
[CrossRef]

Phys. Rev. Lett. (14)

C. Simon, H. de Riedmatten, M. Afzelius, N. Sangouard, H. Zbinden, and N. Gisin,"Quantum repeaters with photon pair sources and multimode memories," Phys. Rev. Lett. 98, 190503 (2007).
[CrossRef] [PubMed]

M. T. L. Hsu, G. Hetet, O. Glockl, J. J. Longdell, B. C. Buchler,H.-A. Bachor,P. K. Lam, "Quantum study of information delay in electromagnetically induced transparency," Phys. Rev. Lett. 97, 183601 (2006).
[CrossRef] [PubMed]

D. Akamatsu, Y. Yokoi, M. Arikawa, S. Nagatsuka, T. Tanimura, A. Furusawa, and M. Kozuma, "Ultraslow propagation of squeezed vacuum pulses with electromagnetically induced transparency," Phys. Rev. Lett. 99, 153602 (2007).
[CrossRef] [PubMed]

J. Appel, E. Figueroa, D. Korystov, M. Lobino and A. I. Lvovsky, "Quantum memory for squeezed light," Phys. Rev. Lett. 100, 093602 (2008).
[CrossRef] [PubMed]

K. Honda, D. Akamatsu, M. Arikawa, Y. Yokoi, K. Akiba, S. Nagatsuka, T. Tanimura, A. Furusawa and M. Kozuma, "Storage and Retrieval of a Squeezed Vacuum," Phys. Rev. Lett. 100, 093601 (2008).
[CrossRef] [PubMed]

D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, "Storage of light in atomic vapor," Phys. Rev. Lett. 86, 783 (2001).
[CrossRef] [PubMed]

M. Fleischhauer and M. D. Lukin, "Dark-State Polaritons in electromagnetically induced transparency," Phys. Rev. Lett. 84, 5094 (2000).
[CrossRef] [PubMed]

M. D. Reid and P. D. Drummond, "Quantum correlations of phase in nondegenerate parametric oscillation," Phys. Rev. Lett. 60, 2731-2733 (1988).
[CrossRef] [PubMed]

L. M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

R. Simon, "Peres-Horodecki separability criterion for continuous variable systems," Phys. Rev. Lett. 84, 2726 (2000).
[CrossRef] [PubMed]

K. McKenzie, N. Grosse,W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland and P. K. Lam, "Squeezing in the Audio Gravitational-Wave Detection Band," Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Z. Y. Ou, S. F. Pereira, H. J. Kimble, and K. C. Peng, "Realization of the Einstein-Podolsky-Rosen paradox for continuous variables," Phys. Rev. Lett. 68, 3663 (1992).
[CrossRef] [PubMed]

W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph, "Experimental Investigation of Criteria for Continuous Variable Entanglement," Phys. Rev. Lett. 90, 043601 (2003).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, "�??Coherent control of vacuum squeezing in the gravitational-wave detection band," Phys. Rev. Lett. 97, 011101 (2006).
[CrossRef] [PubMed]

Other (2)

F. Grosshans and P. Grangier, "Reverse reconciliation protocols for quantum cryptography with continuous variables" quant-ph/0204127, (2002).

J. Cviklinski, J. Ortalo, A. Bramati, M. Pinard, and E. Giacobino, "Reversible Quantum Interface for Tunable Single-sideband Modulation," arXiv 0711.0264 (2007).

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Figures (5)

Fig. 1.
Fig. 1.

Schematic of the experiment. (i) Bow-tie PPKTP optical parametric amplifier. See [14] for details. The squeezed beam (P) is either injected directly into the EIT setup or divided using a beam-splitter to produce a pair of biased entangled beams. (ii) The EIT level scheme. A strong control field (C) pumps most of the atoms in the mF =-2 state and provides the transparency for the squeezed vacuum. A repumping beam (R) brings atoms from the Fg =1 hyperfine sub-level to the Fg =2 level from level Fe =1. (iii) The gas cell used for EIT. (iv) Joint measurements are performed using two homodyne detectors to analyse the quadrature amplitude correlations.

Fig. 2.
Fig. 2.

(a) EIT bandwidth as a function of the transmission measured at 50 kHz, obtained by varying the control beam power. The circle is the regime where graph (c) was obtained. The cell transmission limit is shown by the grey area. (b) Noise measurements of an EIT medium in enhanced 87Rb vapour cells, (i) Shot noise, (ii) with buffer gas and (iii) without buffer gas. (c) Transmission spectra of the squeezed light through an enhanced 87Rb vapour cell with buffer gas. (i) Squeezing and (ii) anti-squeezing measured away from atomic resonance; (iii) shot noise; and (iv) squeezing and (v) anti-squeezing measured on resonance under EIT conditions.

Fig. 3.
Fig. 3.

Different continuous variable entangled states. i) Two squeezed light sources a and b are mixed on a 50/50 beam-splitter. The resulting outputs c and d possess quantum correlations. On the right, the conditional deviation graphs for the output amplitude and phase quadratures. The blue circles represent the QNL conditional deviation and the red ellipses the entangled beam conditional deviation. ii) Beam b is replaced by a vacuum state. iii) Beam b is a vacuum state and beam c experiences some loss. Explanations in the text.

Fig. 4.
Fig. 4.

Correlation measurements. (i) and (ii): Scatter plots of the amplitude and phase quadratures respectively as measured for the beams c and d. The lasers were not resonant and there is no EIT. (iii) and (iv): Data as above but with EIT switched on. The solid black curves show the conditional deviation σ± θ calculated from the data. The dashed circles show the QNL conditional deviation obtained by blocking the two entangled paths. The coordinates of the red data points have been scaled down by a factor of two for clarity.

Fig. 5.
Fig. 5.

a) Degree of correlation between the two entangled arms as a function of delay, τ. b) Output photocurrent versus input photocurrent conditional deviations. The circle represents the shot noise limit. The dashed and plain line the off-resonance and EIT case.

Equations (10)

Equations on this page are rendered with MathJax. Learn more.

V ± ( c | d ) = V c ± ( 1 X ̂ c ± X ̂ d ± 2 V d ± V c ± )
σ θ ± = V θ ± ( 1 ( C θ ± ) 2 ) ,
( σ θ ± ) 2 = 1 2 ( 1 sin ( 2 θ ) ) V a ± + 1 2 ( 1 + sin ( 2 θ ) ) V b ±
( V b ± V a ± ) 2 cos 2 ( 2 θ ) 2 ( 1 sin ( 2 θ ) ) V b ± + 2 ( 1 + sin ( 2 θ ) ) V b ±
V + ( c d ) V ( c d ) = 4 V a V b V a + V b + ( V a + V b + ) ( V a + + V b )
C cd ij = 1 2 X ̂ c i X ̂ d j + X ̂ d i X ̂ c j X ̂ c i X ̂ d j
𝓘 = C I + C I k + 1 k ,
C I ± = k C xx ± ± + ( 1 k ) C yy ± ± 2 C xy ± ±
k = ( C yy ± ± 1 C xx ± ± 1 ) 1 2 .
𝓘 = V ( X c + ± X d + ) V ( X c ± X d ) < 1

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