Abstract

We experimentally demonstrated that the quantum correlations of amplitude and phase quadratures between signal and idler beams produced from a non-degenerate optical parametric amplifier (NOPA) can be significantly improved by using a mode cleaner in the pump field and reducing the phase fluctuations in phase locking systems. Based on the two technical improvements the quantum entanglement measured with a two-mode homodyne detector is enhanced from ~ 4 dB to ~ 6 dB below the quantum noise limit using the same NOPA and nonlinear crystal.

© 2010 Optical Society of America

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  1. A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
    [CrossRef] [PubMed]
  2. H. Yonezawa, T. Aoki, and A. Furusawa, "Demonstration of a quantum teleportation network for continuous variables," Nature 431,430-433 (2004)
    [PubMed]
  3. W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
    [CrossRef]
  4. X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
    [CrossRef] [PubMed]
  5. J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
    [CrossRef] [PubMed]
  6. X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
    [CrossRef]
  7. K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
    [CrossRef]
  8. X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
    [CrossRef]
  9. N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
    [CrossRef] [PubMed]
  10. A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
    [CrossRef]
  11. J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
    [CrossRef] [PubMed]
  12. A. Furusawa, and N. Takei, "Quantum teleportation for continuous variables and related quantum information processing," Phys. Rep. 443, 97-119 (2007).
    [CrossRef]
  13. S. F. Pereira, K. C. Peng, and H. J. Kimble, "Squeezed state generation and nonclassical correlations in nondegenerate parametric down conversion," in Coherence and Quantum Optics VI, J. H. Eberly, L. Mandel and E. Wolf, eds., (Plenum, New York, 1990) pp. 889-890
  14. 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]
  15. Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
    [CrossRef]
  16. 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]
  17. J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
    [CrossRef]
  18. A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
    [CrossRef] [PubMed]
  19. X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
    [PubMed]
  20. J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
    [CrossRef]
  21. Y. Takeno, M. Yukawa, H. Yonezawa, and A. Furusawa, "Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement," Opt. Express 15,4321-4327 (2007). http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-7-4321
    [CrossRef] [PubMed]
  22. H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
    [CrossRef] [PubMed]
  23. M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
    [CrossRef]
  24. R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
    [CrossRef]
  25. J. Zhang and K. C. Peng, "Quantum teleportation and dense coding by means of bright amplitude-squeezed light and direct measurement of a Bell state," Phys. Rev. A 62, 064302 (2000).
    [CrossRef]
  26. Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability Criterion for Continuous Variable Systems," Phys. Rev. Lett. 84, 2722 (2000).
    [CrossRef] [PubMed]
  27. P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
    [CrossRef]

2009

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

2008

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
[CrossRef]

2007

2006

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

2005

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[CrossRef] [PubMed]

2004

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

H. Yonezawa, T. Aoki, and A. Furusawa, "Demonstration of a quantum teleportation network for continuous variables," Nature 431,430-433 (2004)
[PubMed]

2003

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[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]

2002

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
[CrossRef]

2001

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

2000

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

J. Zhang and K. C. Peng, "Quantum teleportation and dense coding by means of bright amplitude-squeezed light and direct measurement of a Bell state," Phys. Rev. A 62, 064302 (2000).
[CrossRef]

Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability Criterion for Continuous Variable Systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

1998

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

1992

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]

1983

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Andersen, U. L.

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

Aoki, T.

H. Yonezawa, T. Aoki, and A. Furusawa, "Demonstration of a quantum teleportation network for continuous variables," Nature 431,430-433 (2004)
[PubMed]

Bencheikh, K.

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

Bloomer, R.

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

Bowen, W. P.

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, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

Braunstein, S. L.

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

Buchler, B. C.

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

Cassemiro, K. N.

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[CrossRef] [PubMed]

Chelkowski, S.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Cochrane, P. T.

P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
[CrossRef]

Coudreau, T.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

Cruz, L. S.

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[CrossRef] [PubMed]

Danzmann, K.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Drever, R. W. P.

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Fabre, C.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

Feng, S.

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

Ford, G. M

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Franzen, A.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Fuchs, C. A.

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

Furusawa, A.

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
[CrossRef]

Y. Takeno, M. Yukawa, H. Yonezawa, and A. Furusawa, "Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement," Opt. Express 15,4321-4327 (2007). http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-7-4321
[CrossRef] [PubMed]

A. Furusawa, and N. Takei, "Quantum teleportation for continuous variables and related quantum information processing," Phys. Rep. 443, 97-119 (2007).
[CrossRef]

H. Yonezawa, T. Aoki, and A. Furusawa, "Demonstration of a quantum teleportation network for continuous variables," Nature 431,430-433 (2004)
[PubMed]

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

Gao, J. R.

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

Goßler, S.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Gu, M.

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

Hage, B.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Hall, J. L.

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Hough, J

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Huck, A.

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

Jankovic, A.

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

Jia, X.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Jia, X. J.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

Jin, X. L.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

Jing, J. T.

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

Keller, G.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

Kimble, H. J.

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[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]

Kowalski, F. V.

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Lam, P. K.

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]

Lastzka, N.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Laurat, J.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

Levenson, J. A.

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

Li, X. Y.

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

Lu-Ming Duan,

Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller, "Inseparability Criterion for Continuous Variable Systems," Phys. Rev. Lett. 84, 2722 (2000).
[CrossRef] [PubMed]

Martinelli, M.

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[CrossRef] [PubMed]

Mehmet, M.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Menicucci, N. C.

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

Milburn, G. J.

P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
[CrossRef]

Miwa, Y.

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

Munley, A. J.

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Nielsen, M. A.

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

Nussenzveig, P.

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[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]

Pan, Q.

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

Peng, K.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Peng, K. C.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

J. Zhang and K. C. Peng, "Quantum teleportation and dense coding by means of bright amplitude-squeezed light and direct measurement of a Bell state," Phys. Rev. A 62, 064302 (2000).
[CrossRef]

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]

Pfister, O.

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

Polzik, E. S.

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

Ralph, T. C.

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[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]

P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
[CrossRef]

Schnabel, R.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[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]

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

Sørensen, J. L.

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and E. S. Polzik, "Unconditional Quantum Teleportation," Science 282, 706-709 (1998).
[CrossRef] [PubMed]

Su, X.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Su, X. L.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

Symul, T.

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

Takei, N.

A. Furusawa, and N. Takei, "Quantum teleportation for continuous variables and related quantum information processing," Phys. Rep. 443, 97-119 (2007).
[CrossRef]

Takeno, Y.

Tan, A.

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Tan, A. H.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

Treps, N.

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

Ukai, R.

M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
[CrossRef]

Vahlbruch, H.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

van Loock, P.

M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
[CrossRef]

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

Villar, A. S.

A. S. Villar, L. S. Cruz, K. N. Cassemiro, M. Martinelli, and P. Nussenzveig, "Generation of bright two-color continuous variable entanglement," Phys. Rev. Lett. 95, 243603 (2005).
[CrossRef] [PubMed]

Wang, H.

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

Wang, W.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

Wang, Y.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

Ward, H

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Weedbrook, C.

N. C. Menicucci, P. van Loock, M. Gu, C. Weedbrook, T. C. Ralph, and M. A. Nielsen, "Universal Quantum Computation with Continuous-Variable Cluster States," Phys. Rev. Lett. 97, 110501 (2006).
[CrossRef] [PubMed]

Xie, C.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Xie, C. D.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

Yan, Y.

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

Yonezawa, H.

Yoshikawa, J.

J. Yoshikawa, Y. Miwa, A. Huck, U. L. Andersen, P. van Loock, and A. Furusawa, "Demonstration of a Quantum Nondemolition Sum Gate," Phys. Rev. Lett. 101, 250501 (2008).
[CrossRef] [PubMed]

Yukawa, M.

Zhang, J.

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

J. Zhang and K. C. Peng, "Quantum teleportation and dense coding by means of bright amplitude-squeezed light and direct measurement of a Bell state," Phys. Rev. A 62, 064302 (2000).
[CrossRef]

Zhang, Y.

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

Zhao, F. G.

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

Appl. Phys. B

R. W. P. Drever, J. L. Hall, F. V. Kowalski, J . Hough, G. M . Ford, A. J. Munley, and H . Ward, "Laser phase and frequency stabilization using an optical resonator," Appl. Phys. B 31, 97-105 (1983).
[CrossRef]

Europhys. Lett.

X. Su, W. Wang, Y. Wang, X. Jia, C. Xie, and K. Peng, "Continuous variable quantum key distribution based on optical entangled states without signal modulation," Europhys. Lett. 87, 2000-2005 (2009).
[CrossRef]

J. Mod. Opt.

K. Bencheikh, T. Symul, A. Jankovic, and J. A. Levenson, "Quantum key distribution with continuous variables," J. Mod. Opt. 48, 1903-1920 (2001).
[CrossRef]

Nature

H. Yonezawa, T. Aoki, and A. Furusawa, "Demonstration of a quantum teleportation network for continuous variables," Nature 431,430-433 (2004)
[PubMed]

Opt. Express

Opt. Lett

X. Su, A. Tan, X. Jia, Q. Pan, C. Xie, and K. Peng, "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams," Opt. Lett.  31, 1133-1135 (2006)
[PubMed]

Phys. Rep.

A. Furusawa, and N. Takei, "Quantum teleportation for continuous variables and related quantum information processing," Phys. Rep. 443, 97-119 (2007).
[CrossRef]

Phys. Rev. A

A. H. Tan, Y. Wang, X. L. Jin, X. L. Su, X. J. Jia, J. Zhang, C. D. Xie, and K. C. Peng, "Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables," Phys. Rev. A 78, 013828 (2008).
[CrossRef]

Y. Zhang, H. Wang, X. Y. Li, J. T. Jing, C. D. Xie, and K. C. Peng, "Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier," Phys. Rev. A 62, 023813 (2000).
[CrossRef]

J. Laurat, T. Coudreau, G. Keller, N. Treps, and C. Fabre, "Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold," Phys. Rev. A 71, 022313 (2005).
[CrossRef]

W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor, T. Symul, and P. K. Lam, "Experimental investigation of continuous-variable quantum teleportation," Phys. Rev. A 67, 032302 (2003).
[CrossRef]

J. T. Jing, S. Feng, R. Bloomer, and O. Pfister, "Experimental continuous-variable entanglement of phase-locked bright optical beams," Phys. Rev. A 74, 041804 (2006).
[CrossRef]

J. Zhang and K. C. Peng, "Quantum teleportation and dense coding by means of bright amplitude-squeezed light and direct measurement of a Bell state," Phys. Rev. A 62, 064302 (2000).
[CrossRef]

M. Yukawa, R. Ukai, P. van Loock, and A. Furusawa, "Experimental generation of four-mode continuous-variable cluster states," Phys. Rev. A 78, 012301 (2008).
[CrossRef]

P. T. Cochrane, T. C. Ralph, and G. J. Milburn, "Teleportation improvement by conditional measurements on the two-mode squeezed vacuum," Phys. Rev. A 65, 062306 (2002).
[CrossRef]

Phys. Rev. Lett.

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]

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[CrossRef] [PubMed]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Goßler, K. Danzmann, and R. Schnabel, "Observation of Squeezed Light with 10-dB Quantum-Noise Reduction," Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

X. Y. Li, Q. Pan, J. T. Jing, J. Zhang, C. D. Xie, and K. C. Peng, "Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam," Phys. Rev. Lett. 88, 047904 (2002).
[CrossRef] [PubMed]

J. T. Jing, J. Zhang, Y. Yan, F. G. Zhao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables," Phys. Rev. Lett. 90, 167903 (2003).
[CrossRef] [PubMed]

X. J. Jia, X. L. Su, Q. Pan, J. R. Gao, C. D. Xie, and K. C. Peng, "Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables," Phys. Rev. Lett. 93, 250503 (2004).
[CrossRef]

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[CrossRef] [PubMed]

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[CrossRef] [PubMed]

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Science

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[CrossRef] [PubMed]

Other

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Figures (3)

Fig. 1.
Fig. 1.

(Color online) Schematic of the experimental setup. MC1-2: mode cleaner, PZT: pieoelectric transducer, Servo: servo amplifier circuit for feedback system, EOM: electro-optical modulator, HWP: half wave-plate, NOPA: nondegenerate optical parametric amplifier, PBS: polarization beamsplitter, TMHD: two-mode homodyne detector for continuous variable entanglement, PD1-2: photodiode detector (ETX500 InGaAs), RF: radio frequency power splitter, ⊕: positive power combiner; ⊗: negative power combiner, SAs: spectrum analyzers.

Fig. 2.
Fig. 2.

(Color online) The measured noise powers of amplitude (a) and phase (b) quadratures of pump laser. Black lines: QNL, red lines: noise of pump laser with MC2, blue lines: noise of pump laser without MC2. Insets: the noises of amplitude (a) and phase (b) quadratures at 2 MHz. The parameter of spectrum analyzer: RBW: 30 kHz, VBW: 100 Hz.

Fig. 3.
Fig. 3.

(Color online) The measured noise powers of amplitude sum (a) and phase difference (b) at 2 MHz. The parameter of spectrum analyzer: RBW: 30 kHz, VBW: 100 Hz.

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