Abstract

We demonstrate a wavelength-tunable, fiber-coupled source of polarization-entangled photons with extremely high spectral brightness and quality of entanglement. Using a 25 mm PPKTP crystal inside a polarization Sagnac interferometer we detect a spectral brightness of 273000 pairs (s mW nm)-1, a factor of 28 better than comparable previous sources while state tomography showed the two-photon state to have a tangle of T = 0.987. This improvement was achieved by use of a long crystal, careful selection of focusing parameters and single-mode fiber coupling. We demonstrate that, due to the particular geometry of the setup, the signal and idler wavelengths can be tuned over a wide range without loss of entanglement.

© 2007 Optical Society of America

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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]

2007

2006

T. Kim, M. Fiorentino, and F. N. C. Wong, "Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer," Phys. Rev. A 73, 012316 (2006).
[CrossRef]

F. N. C. Wong, J. H. Shapiro, and T. Kim, "Efficient generation of polarization-entangled photons in a nonlinear crystal," Laser Physics,  16, 1517-1524, (2006).
[CrossRef]

2005

D. Ljunggren and M. Tengner, "Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers," Phys. Rev. A 72, 062301 (2005).
[CrossRef]

M. Fiorentino, C. E. Kuklewicz, and F. Wong, "Source of polarization entanglement in a single periodically poled KTiOPO4 crystal with overlapping emission cones," Opt. Express 13, 1, 127-135 (2005).
[CrossRef] [PubMed]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

2004

M. Pelton, P. Marsden, D. Ljunggren, M. Tengner, A. Karlsson, A. Fragemann, C. Canalias, and F. Laurell, "Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP," Opt. Express 12, 3573-3580 (2004).
[CrossRef] [PubMed]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

B. S. Shi and A. Tomita, "Generation of a pulsed polarization entangled photon pair using a Sagnac interferometer," Phys. Rev. A 69, 013803 (2004).
[CrossRef]

D. N. Matsukevich and A. Kuzmich, "Quantum state transfer between matter and light," Science 306, 663-666 (2004).
[CrossRef] [PubMed]

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

2003

S. Emanueli and A. Arie, "Temperature-dependent dispersion equations for KTiOPO4 and KTiOAsO4," Appl. Opt. 42, 6661-6665, (2003).
[CrossRef] [PubMed]

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

2002

K. Kato and E. Takaoka, "Sellmeier and thermo-optic formulas for KTP," Appl. Opt. 41, 50405044 (2002).
[CrossRef]

2001

D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
[CrossRef]

C. Kurtsiefer, M. Oberparleitner, and H. Weinfurter, "High-efficiency entangled photon pair collection in type-II parametric fluorescence," Phys. Rev. A 64, 023802 (2001).
[CrossRef]

E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature (London) 409, 46-52 (2001).
[CrossRef]

2000

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

V. Coffman, J. Kundu, and W. K. Wootters, "Distributed entanglement," Phys. Rev. A 61, 052306 (2000).
[CrossRef]

1997

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

1995

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

1994

M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
[CrossRef] [PubMed]

1993

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

1991

A. K. Ekert, "Quantum cryptography based on Bells theorem," Phys. Rev. Lett. 67, 661-663 (1991).
[CrossRef] [PubMed]

Albota, M. A.

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

Arie, A.

Aspelmeyer, M.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Bao, X. H.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Beausoleil, R. G.

Bennett, C. H.

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Blauensteiner, B.

Boehm, H. R.

Bouwmeester, D.

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

Bovino, F. A.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Brassard, G.

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Brukner, C.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Canalias, C.

Castagnoli, G.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Chiao, R. Y.

P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

Cirac, I.

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Coffman, V.

V. Coffman, J. Kundu, and W. K. Wootters, "Distributed entanglement," Phys. Rev. A 61, 052306 (2000).
[CrossRef]

Colla, M. A.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Crépeau, C.

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Di Giuseppe, G.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Eberhard, P. H.

P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

Eibl, M.

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

Ekert, A. K.

A. K. Ekert, "Quantum cryptography based on Bells theorem," Phys. Rev. Lett. 67, 661-663 (1991).
[CrossRef] [PubMed]

Emanueli, S.

Fan, J.

Fedrizzi, A.

Feng, F. Y.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Fiorentino, M.

S. M. Spillane, M. Fiorentino, and R. G. Beausoleil, "Spontaneous parametric down conversion in a nanophotonic waveguide," Opt. Express 15, 8770-8780, (2007).
[CrossRef] [PubMed]

T. Kim, M. Fiorentino, and F. N. C. Wong, "Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer," Phys. Rev. A 73, 012316 (2006).
[CrossRef]

M. Fiorentino, C. E. Kuklewicz, and F. Wong, "Source of polarization entanglement in a single periodically poled KTiOPO4 crystal with overlapping emission cones," Opt. Express 13, 1, 127-135 (2005).
[CrossRef] [PubMed]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

Fiurasek, J.

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Fragemann, A.

Gröblacher, S.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Hadfield, R. H.

Hübel, H.

James, D. F. V.

D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
[CrossRef]

Jennewein, T.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

Jin, X. M.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Jozsa, R.

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Julsgaard, B.

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Kaltenbaek, R.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Karlsson, A.

Kato, K.

K. Kato and E. Takaoka, "Sellmeier and thermo-optic formulas for KTP," Appl. Opt. 41, 50405044 (2002).
[CrossRef]

Kim, T.

F. N. C. Wong, J. H. Shapiro, and T. Kim, "Efficient generation of polarization-entangled photons in a nonlinear crystal," Laser Physics,  16, 1517-1524, (2006).
[CrossRef]

T. Kim, M. Fiorentino, and F. N. C. Wong, "Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer," Phys. Rev. A 73, 012316 (2006).
[CrossRef]

Klyshko, D. N.

M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
[CrossRef] [PubMed]

Knill, E.

E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature (London) 409, 46-52 (2001).
[CrossRef]

König, F.

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

Kuklewicz, C. E.

M. Fiorentino, C. E. Kuklewicz, and F. Wong, "Source of polarization entanglement in a single periodically poled KTiOPO4 crystal with overlapping emission cones," Opt. Express 13, 1, 127-135 (2005).
[CrossRef] [PubMed]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

Kumar, P.

Kundu, J.

V. Coffman, J. Kundu, and W. K. Wootters, "Distributed entanglement," Phys. Rev. A 61, 052306 (2000).
[CrossRef]

Kurtsiefer, C.

Kuzmich, A.

D. N. Matsukevich and A. Kuzmich, "Quantum state transfer between matter and light," Science 306, 663-666 (2004).
[CrossRef] [PubMed]

Kwiat, P. G.

P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
[CrossRef]

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

Laflamme, R.

E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature (London) 409, 46-52 (2001).
[CrossRef]

Laurell, F.

Lederer, T.

Lee, K. F.

Li, N.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Liang, C.

Lindenthal, M.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

Ljunggren, D.

Lorünser, T.

Marsden, P.

Mason, E. J.

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

Matsukevich, D. N.

D. N. Matsukevich and A. Kuzmich, "Quantum state transfer between matter and light," Science 306, 663-666 (2004).
[CrossRef] [PubMed]

Mattle, K.

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

Medic, M.

Messin, G.

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

Migdall, A.

Milburn, G. J.

E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature (London) 409, 46-52 (2001).
[CrossRef]

Munro, W. J.

D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
[CrossRef]

Nam, S. W.

Oberparleitner, M.

C. Kurtsiefer, M. Oberparleitner, and H. Weinfurter, "High-efficiency entangled photon pair collection in type-II parametric fluorescence," Phys. Rev. A 64, 023802 (2001).
[CrossRef]

Pan, J. W.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

Paterek, T.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Pelton, M.

Peng, C. Z.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Perdigues, J.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

Peres, A.

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Polzik, E. S.

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Poppe, A.

Resch, K. J.

Rubin, M. H.

M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
[CrossRef] [PubMed]

Scheidl, T.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

Schmitt-Manderbach, T.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

Sergienko, A. V.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
[CrossRef] [PubMed]

Shapiro, J. H.

F. N. C. Wong, J. H. Shapiro, and T. Kim, "Efficient generation of polarization-entangled photons in a nonlinear crystal," Laser Physics,  16, 1517-1524, (2006).
[CrossRef]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

Sherson, J.

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Shi, B. S.

B. S. Shi and A. Tomita, "Generation of a pulsed polarization entangled photon pair using a Sagnac interferometer," Phys. Rev. A 69, 013803 (2004).
[CrossRef]

Shi, Y. H.

M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
[CrossRef] [PubMed]

Shih, Y.

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

Simon, C.

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

Spillane, S. M.

Steinberg, A. M.

P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

Takaoka, E.

K. Kato and E. Takaoka, "Sellmeier and thermo-optic formulas for KTP," Appl. Opt. 41, 50405044 (2002).
[CrossRef]

Taraba, M.

Tengner, M.

Tian, B. L.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Tiefenbacher, F.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

Tomita, A.

B. S. Shi and A. Tomita, "Generation of a pulsed polarization entangled photon pair using a Sagnac interferometer," Phys. Rev. A 69, 013803 (2004).
[CrossRef]

Trojek, P.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

Ursin, R.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

Vanner, M. R.

Varisco, P.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Walther, P.

Weier, H.

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

Weihs, G.

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

Weinfurter, H.

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

C. Kurtsiefer, M. Oberparleitner, and H. Weinfurter, "High-efficiency entangled photon pair collection in type-II parametric fluorescence," Phys. Rev. A 64, 023802 (2001).
[CrossRef]

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
[CrossRef]

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

Weinurter, H.

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

White, A. G.

D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
[CrossRef]

Wong, F.

Wong, F. N. C.

T. Kim, M. Fiorentino, and F. N. C. Wong, "Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer," Phys. Rev. A 73, 012316 (2006).
[CrossRef]

F. N. C. Wong, J. H. Shapiro, and T. Kim, "Efficient generation of polarization-entangled photons in a nonlinear crystal," Laser Physics,  16, 1517-1524, (2006).
[CrossRef]

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
[CrossRef]

Wootters, W. K.

V. Coffman, J. Kundu, and W. K. Wootters, "Distributed entanglement," Phys. Rev. A 61, 052306 (2000).
[CrossRef]

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
[CrossRef] [PubMed]

Yang, B.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Yang, J.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Yang, T.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Yin, J.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Zeilinger, A.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

H. Hübel, M. R. Vanner, T. Lederer, B. Blauensteiner, T. Lorünser, A. Poppe, and A. Zeilinger, "High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber," Opt. Express 15, 7853-7862 (2007).
[CrossRef] [PubMed]

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
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D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
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P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

Zhang, J.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Zhang, Q.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

Zukowski, M.

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

Appl. Opt.

Laser Physics

F. N. C. Wong, J. H. Shapiro, and T. Kim, "Efficient generation of polarization-entangled photons in a nonlinear crystal," Laser Physics,  16, 1517-1524, (2006).
[CrossRef]

Nature (London)

S. Gröblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "An experimental test of non-local realism," Nature (London) 446, 871-875, (2007).
[CrossRef]

D. Bouwmeester, J. W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, "Experimental quantum teleportation," Nature (London) 390, 575-579 (1997).
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E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature (London) 409, 46-52 (2001).
[CrossRef]

B. Julsgaard, J. Sherson, I. Cirac, J. Fiurasek, and E. S. Polzik, "Experimental demonstration of quantum memory for light," Nature (London) 432, 482-486 (2004).
[CrossRef]

Nature Physics

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. ¨ Omer, M. F¨urst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, and A. Zeilinger, "Entanglement-based quantum communication over 144km," Nature Physics 3, 481-486 (2007).
[CrossRef]

Opt. Commun.

F. A. Bovino, P. Varisco, M. A. Colla, G. Castagnoli, G. Di Giuseppe, and A. V. Sergienko, "Effective fibercoupling of entangled photons for quantum communication," Opt. Commun. 227, 343-348 (2003).
[CrossRef]

Opt. Express

K. J. Resch, M. Lindenthal, B. Blauensteiner, H. R. Boehm, A. Fedrizzi, C. Kurtsiefer, A. Poppe, T. Schmitt-Manderbach, M. Taraba, R. Ursin, P. Walther, H. Weier, H. Weinfurter, and A. Zeilinger, "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 1, 202-209 (2005).
[CrossRef] [PubMed]

M. Fiorentino, C. E. Kuklewicz, and F. Wong, "Source of polarization entanglement in a single periodically poled KTiOPO4 crystal with overlapping emission cones," Opt. Express 13, 1, 127-135 (2005).
[CrossRef] [PubMed]

H. Hübel, M. R. Vanner, T. Lederer, B. Blauensteiner, T. Lorünser, A. Poppe, and A. Zeilinger, "High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber," Opt. Express 15, 7853-7862 (2007).
[CrossRef] [PubMed]

M. Pelton, P. Marsden, D. Ljunggren, M. Tengner, A. Karlsson, A. Fragemann, C. Canalias, and F. Laurell, "Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP," Opt. Express 12, 3573-3580 (2004).
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J. Fan and A. Migdall, "A broadband high spectral brightness fiber-based two-photon source," Opt. Express 15, 2915-2920 (2007).
[CrossRef] [PubMed]

C. Liang, K. F. Lee, M. Medic, P. Kumar, R. H. Hadfield, and S. W. Nam, "Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors," Opt. Express 15, 1322-1327, (2007).
[CrossRef] [PubMed]

S. M. Spillane, M. Fiorentino, and R. G. Beausoleil, "Spontaneous parametric down conversion in a nanophotonic waveguide," Opt. Express 15, 8770-8780, (2007).
[CrossRef] [PubMed]

Phys. Rev. A

F. König, E. J. Mason, F. N. C. Wong, and M. A. Albota, "Efficient and spectrally bright source of polarization-entangled photons," Phys. Rev. A 71, 033805 (2005).
[CrossRef]

C. E. Kuklewicz, M. Fiorentino, G. Messin, F. N. C. Wong, and J. H. Shapiro, "High-flux source of polarization-entangled photons from a periodically poled KTiOPO4 parametric down-converter," Phys. Rev. A 69, 013807 (2004).
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P. G. Kwiat, P. H. Eberhard, A. M. Steinberg, and R. Y. Chiao, "Proposal for a loophole-free Bell inequality experiment," Phys. Rev. A 49, 3209-3220 (2004).
[CrossRef]

M. Fiorentino, G. Messin, C. E. Kuklewicz, F. N. C. Wong, and J. H. Shapiro, "Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints," Phys. Rev. A 69, 041801 (2004).
[CrossRef]

B. S. Shi and A. Tomita, "Generation of a pulsed polarization entangled photon pair using a Sagnac interferometer," Phys. Rev. A 69, 013803 (2004).
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T. Kim, M. Fiorentino, and F. N. C. Wong, "Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer," Phys. Rev. A 73, 012316 (2006).
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C. Kurtsiefer, M. Oberparleitner, and H. Weinfurter, "High-efficiency entangled photon pair collection in type-II parametric fluorescence," Phys. Rev. A 64, 023802 (2001).
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D. Ljunggren and M. Tengner, "Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers," Phys. Rev. A 72, 062301 (2005).
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M. H. Rubin, D. N. Klyshko, Y. H. Shi, and A. V. Sergienko, "Theory of two-photon entanglement in Type-II optical parametric down-conversion," Phys. Rev. A 50, 5122-5233 (1994).
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D. F. V. James, P. G. Kwiat, W. J. Munro, and A. G. White, "Measurement of qubits," Phys. Rev. A 64, 052312 (2001).
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V. Coffman, J. Kundu, and W. K. Wootters, "Distributed entanglement," Phys. Rev. A 61, 052306 (2000).
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Phys. Rev. Lett.

C. Z. Peng, T. Yang, X. H. Bao, J. Zhang, X. M. Jin, F. Y. Feng, B. Yang, J. Yang, J. Yin, Q. Zhang, N. Li, B. L. Tian, and J. W. Pan, "Experimental free-space distribution of entangled photon pairs over 13km: towards satellite-based global quantum communication," Phys. Rev. Lett. 94, 150501 (2005).
[CrossRef] [PubMed]

P. G. Kwiat, K. Mattle, H. Weinfurter, A. Zeilinger, A. V. Sergienko, and Y. Shih, "New high-intensity source of polarization-entangled photon pairs," Phys. Rev. Lett. 75, 4337-4341 (1995).
[CrossRef] [PubMed]

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[CrossRef] [PubMed]

T. Jennewein, C. Simon, G. Weihs, H. Weinurter, and A. Zeilinger, "Quantum cryptography with entangled photons," Phys. Rev. Lett. 84, 4729-4732 (2000).
[CrossRef] [PubMed]

C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres, and W. K. Wootters, "Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels," Phys. Rev. Lett. 70, 1895-1899 (1993).
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Science

D. N. Matsukevich and A. Kuzmich, "Quantum state transfer between matter and light," Science 306, 663-666 (2004).
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Other

T. Paterek, A. Fedrizzi, S. Gröblacher, T. Jennewein, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, "Experimental test of non-local realistic theories without the rotational symmetry assumption," arXiv:0708.0813v1 [quant-ph].

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Figures (5)

Fig. 1.
Fig. 1.

Measured coincidence count rates Rc (a) and coupling ratios η c (b) for a L = 15 mm crystal for a series of focusing conditions in a simple test setup (described in the text). From these measurements we determined pump (c) and signal (idler) (d) spot waist sizes wp and ws,i for maximal photon-pair count rate R c max and crystals of length 10,15,20 and 25 mm. The detected count rates were repeatable to within 5%. The lines drawn for three constant values of the dimensionless parameters ξ p and ξ s,i (ξ = L/z r , where z r is the Rayleigh range) show the supposed independence of ξ p opt opt and ξ s,i opt of L. While this behavior is certainly given for ξ s,i opt (black dots), it was not observed for ξ p opt. (black triangles).

Fig. 2.
Fig. 2.

Measured spectral bandwidths (FWHM) of downconversion photons and photon-pair yields for PPKTP crystals of various lengths. The single photon bandwidth (black circles) was determined via interference in a single photon Michelson interferometer and is shown compared to theoretic values calculated using Eq. 4 (black line). The measured coincidence rates (red squares) show the expected square root dependence on L (Eq. 3).

Fig. 3.
Fig. 3.

Scheme of the fiber-coupled entangled photon source. A 405nm Littrow diode laser whose polarization and phase are set by a quarter- (QWP) and a half-wave plate (HWP2) is focused via a combination of one spherical and two cylindrical lenses (L) into a PPKTP crystal inside a polarization Sagnac loop built up by dual-wavelength polarizing beamsplitter (PBS) a dual-wavelength half-wave plate (HWP1) (anti-reflection coated for 405 and 810 nm) and two laser mirrors. The downconversion modes are coupled into single-mode fibers (SMF). Remaining stray laser light is blocked by two RG715 longpass color glass filters (LP). Polarizers (Pol1, Pol2) can be inserted to characterize the produced photon pairs.

Fig. 4.
Fig. 4.

(color online) Tomography of the two-photon quantum state. The real (a) and imaginary (b) part of the density matrix was reconstructed from 36 linearly independent coincidence measurements. The resulting fidelity F to the |03C8; -〉 state was F = 0.9959 ± 0.0001 and the Tangle T = 0.9875 ± 0.0003. Within the resolution of this representation the experimental graph is in excellent agreement to the theoretic expectation.

Fig. 5.
Fig. 5.

Signal (black rectangles) and idler (red circles) wavelengths and 2-photon visibility (blue triangles) as a function of crystal temperature. The wavelengths were measured with a scanning single photon spectrometer with a resolution of 0.2 nm. Our crystal oven allows us to reach a wavelength spacing of more than 50 nm.

Equations (4)

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k p ( λ p , n p ( λ p , T ) ) = k s ( λ s , n s ( λ s , T ) ) + k i ( λ i , n i ( λ i , T ) ) + 2 π Λ ( T )
I sinc 2 ( L 2 Δ k )
R c L .
Δ λ s , iFWHM = 5.52 x 10 3 L nm

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