Abstract

We present several novel sources of polarization-entangled states based on beam displacer interferometers. These sources generate a large number of high-quality entangled photon pairs in a compact alignment-free layout and can work with both cw and pulsed pumps.

© 2008 Optical Society of America

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References

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  1. 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 (1994).
    [CrossRef] [PubMed]
  2. 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]
  3. 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]
  4. 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]
  5. A. Fedrizzi, T. Herbst, A. Poppe, T. Jennewein, and A. Zeilinger, "A wavelength-tunable fiber-coupled source of narrowband entangled photons," Opt. Express 15, 15377-15386 (2007).
    [CrossRef] [PubMed]
  6. R. Ursin, T. Jennewein, J. Kofler, J. M. Perdigues, L. Cacciapuoti, C. J. de Matos, M. Aspelmeyer, A. Valencia, T. Scheidl, A. Fedrizzi, A. Acin, C. Barbieri, G. Bianco, C. Brukner, J. Capmany, S. Cova, D. Giggenbach, W. Leeb, R. H. Hadfield, R. Laflamme, N. Lutkenhaus, G. Milburn, M. Peev, T. Ralph, J. Rarity, R. Renner, E. Samain, N. Solomos, W. Tittel, J. P. Torres, M. Toyoshima, A. Ortigosa-Blanch, V. Pruneri, P. Villoresi, I. Walmsley, G. Weihs, H. Weinfurter, M. Zukowski, and A. Zeilinger, "Space-QUEST: Experiments with quantum entanglement in space," (2008). URL http://www.citebase.org/abstract?id=oai:arXiv.org:0806.0945.
  7. J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
    [CrossRef] [PubMed]
  8. P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
    [CrossRef]
  9. P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
    [CrossRef] [PubMed]
  10. W. Grice (2008). Personal communication.
  11. R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
    [CrossRef] [PubMed]
  12. R. Chen (2006). Personal communication.
  13. D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
    [CrossRef]
  14. A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
    [CrossRef]
  15. J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
    [CrossRef]

2008 (1)

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

2007 (1)

2006 (1)

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]

2004 (1)

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]

2003 (1)

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

2002 (1)

R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
[CrossRef] [PubMed]

1999 (1)

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[CrossRef]

1995 (1)

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 (1)

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 (1994).
[CrossRef] [PubMed]

1987 (1)

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

1982 (1)

A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
[CrossRef]

1969 (1)

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Appel, R.

R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
[CrossRef] [PubMed]

Appelbaum, I.

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[CrossRef]

Aspect, A.

A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
[CrossRef]

Branning, D.

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

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 (1994).
[CrossRef] [PubMed]

Clauser, J. F.

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Davis, L.

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Dyer, C. D.

R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
[CrossRef] [PubMed]

Eberhard, P. H.

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[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 (1994).
[CrossRef] [PubMed]

Eimerl, D.

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Fedrizzi, A.

Fiorentino, M.

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, 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]

Graham, E. K.

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Grangier, P.

A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
[CrossRef]

Herbst, T.

Holt, R. A.

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Horne, M. A.

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Jennewein, T.

Kim, T.

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]

Kuklewicz, C. E.

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]

Kwiat, P. G.

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[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]

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 (1994).
[CrossRef] [PubMed]

Lockwood, J. N.

R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
[CrossRef] [PubMed]

Lundeen, J. S.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

Mattle, K.

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]

Messin, G.

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]

Mosley, P. J.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

O’Brien, J. L.

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

Poppe, A.

Pryde, G. J.

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

Ralph, T. C.

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

Roger, G.

A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
[CrossRef]

Sergienko, A. V.

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]

Shapiro, J. H.

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]

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]

Shimony, A.

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Smith, B. J.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

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 (1994).
[CrossRef] [PubMed]

Velsko, S.

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Waks, E.

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[CrossRef]

Wasylczyk, P.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

Weinfurter, H.

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]

White, A. G.

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[CrossRef]

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]

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]

Zalkin, A.

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Zeilinger, A.

A. Fedrizzi, T. Herbst, A. Poppe, T. Jennewein, and A. Zeilinger, "A wavelength-tunable fiber-coupled source of narrowband entangled photons," Opt. Express 15, 15377-15386 (2007).
[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]

Applied Optics (1)

R. Appel, C. D. Dyer, and J. N. Lockwood, "Design of a broadband UV-visible alpha-barium borate polarizer," Applied Optics 41, 2470-2480 (2002).
[CrossRef] [PubMed]

J. of App. Phys. (1)

D. Eimerl, L. Davis, S. Velsko, E. K. Graham, and A. Zalkin, "Optical, mechanical, and thermal properties of barium borate," J. of App. Phys. 62, 1968-1983 (1987).
[CrossRef]

Nature (1)

J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, "Demonstration of an all-optical quantum controlled-NOT gate," Nature 426, 264 (2003).
[CrossRef] [PubMed]

Opt. Express (1)

Phys. Rev. A (4)

P. G. Kwiat, E. Waks, A. G. White, I. Appelbaum, and P. H. Eberhard, "Ultra-bright source of polarizationentangled photons," Phys. Rev. A 60, 773 (1999).
[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 (1994).
[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]

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]

Phys. Rev. Lett. (4)

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]

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. U’Ren, C. Silberhorn, and I. A.Walmsley, "Heralded Generation of Ultrafast Single Photons in Pure Quantum States," Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef] [PubMed]

A. Aspect, P. Grangier, and G. Roger, "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell’s Inequalities," Phys. Rev. Lett. 49, 91-94 (1982).
[CrossRef]

J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, "Proposed Experiment to Test Local Hidden-Variable Theories," Phys. Rev. Lett. 23, 880-884 (1969).
[CrossRef]

Other (3)

R. Ursin, T. Jennewein, J. Kofler, J. M. Perdigues, L. Cacciapuoti, C. J. de Matos, M. Aspelmeyer, A. Valencia, T. Scheidl, A. Fedrizzi, A. Acin, C. Barbieri, G. Bianco, C. Brukner, J. Capmany, S. Cova, D. Giggenbach, W. Leeb, R. H. Hadfield, R. Laflamme, N. Lutkenhaus, G. Milburn, M. Peev, T. Ralph, J. Rarity, R. Renner, E. Samain, N. Solomos, W. Tittel, J. P. Torres, M. Toyoshima, A. Ortigosa-Blanch, V. Pruneri, P. Villoresi, I. Walmsley, G. Weihs, H. Weinfurter, M. Zukowski, and A. Zeilinger, "Space-QUEST: Experiments with quantum entanglement in space," (2008). URL http://www.citebase.org/abstract?id=oai:arXiv.org:0806.0945.

R. Chen (2006). Personal communication.

W. Grice (2008). Personal communication.

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Figures (5)

Fig. 1.
Fig. 1.

Schematics various implementations of the compact sources of polarization-entangled photons. (a) Quasi degenerate source (b) Non-degenerate source (c) Degenerate source. The state generated by each source is written on the right, the phase factor θ can be adjusted by aligning the interferometer. HWP: half-wave plate. BD: polarization beam displacer. DM: dichroic mirror. PBS: polarization beam-splitter.

Fig. 2.
Fig. 2.

Measured and calculated double refraction angle in an α-BBO crystal with the optical axis forming an angle of 45° with respect to the beam propagation direction.

Fig. 3.
Fig. 3.

Visibility results for the polarization-entangled state generated in the quasi-degenerate cw source. Plotted here are the coincidence counts versus idler analyzer angle when the signal analyzer angle is set to 0° (diamonds) and 45° (triangles). Each data point is the result of an average over 10 s and the curves are best fits to the data.

Fig. 4.
Fig. 4.

Visibility results for the polarization-entangled state generated in the quasidegenerate pulsed source. Plotted here are the coincidence counts versus idler analyzer angle when the signal analyzer angle is set to 0° (diamonds) and 45° (triangles). Each data point is the result of an average over 10 s and the curves are best fits to the data.

Fig. 5.
Fig. 5.

Visibility results for the polarization-entangled state generated in the non-degenerate cw source. Plotted here are the coincidence counts versus idler analyzer angle when the signal analyzer angle is set to 0° (diamonds) and 45° (triangles). Each data point is the result of an average over 10 s and the curves are best fits to the data.

Equations (1)

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θ = arctan ( n o 2 n e 2 ) π 4

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