Abstract

Spectrally correlated photon pairs can be used to improve the performance of long-range fiber-based quantum communication protocols. We present a source based on spontaneous parametric downconversion, which allows one to control spectral correlations within the entangled photon pair without spectral filtering by changing the pump-pulse duration or the characteristics of the coupled spatial modes. The spectral correlations and polarization entanglement are characterized. We find that the generated photon pairs can feature both positive spectral correlations, decorrelation, or negative correlations at the same time as polarization entanglement with a high fidelity of 0.97 (no background subtraction) with the expected Bell state.

© 2014 Optical Society of America

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  1. A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).
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    [CrossRef]
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    [CrossRef]
  4. P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
    [CrossRef]
  5. P. Kolenderski, W. Wasilewski, and K. Banaszek, Phys. Rev. A 80, 013811 (2009).
    [CrossRef]
  6. A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, Phys. Rev. Lett. 106, 013603 (2011).
    [CrossRef]
  7. P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
    [CrossRef]
  8. T. Gerrits, M. J. Stevens, B. Baek, B. Calkins, A. Lita, S. Glancy, E. Knill, S. W. Nam, R. P. Mirin, R. H. Hadfield, R. S. Bennink, W. P. Grice, S. Dorenbos, T. Zijlstra, T. Klapwijk, and V. Zwiller, Opt. Express 19, 24434 (2011).
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  19. O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
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    [CrossRef]
  22. Y.-H. Kim and W. P. Grice, J. Mod. Opt. 49, 2309 (2002).
    [CrossRef]
  23. H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
    [CrossRef]
  24. H. Huang and J. Eberly, J. Mod. Opt. 40, 915 (1993).
    [CrossRef]
  25. H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
    [CrossRef]
  26. A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
    [CrossRef]
  27. R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
    [CrossRef]
  28. M. A. Nielsen and I. L. Chuang, Quantum Computation and Quantum Information, 1st ed. (Cambridge University, 2000).
  29. W. K. Wootters, Phys. Rev. Lett. 80, 2245 (1998).
    [CrossRef]

2013

2012

A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
[CrossRef]

2011

2010

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
[CrossRef]

2009

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

P. Kolenderski, W. Wasilewski, and K. Banaszek, Phys. Rev. A 80, 013811 (2009).
[CrossRef]

2008

O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
[CrossRef]

C. I. Osorio, A. Valencia, and J. P. Torres, New J. Phys. 10, 113012 (2008).
[CrossRef]

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

2007

A. B. U’Ren, Y. Jeronimo-Moreno, and H. Garcia-Gracia, Phys. Rev. A 75, 023810 (2007).
[CrossRef]

B. Dayan, Phys. Rev. A 76, 043813 (2007).
[CrossRef]

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

M. Hendrych, M. Micuda, and J. P. Torres, Opt. Lett. 32, 2339 (2007).
[CrossRef]

2005

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

B. Dayan, A. Pe’Er, A. A. Friesem, and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

2002

Y.-H. Kim and W. P. Grice, J. Mod. Opt. 49, 2309 (2002).
[CrossRef]

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

2000

J. Gordon and H. Kogelnik, Proc. Natl. Acad. Sci. USA 97, 4541 (2000).
[CrossRef]

1998

W. K. Wootters, Phys. Rev. Lett. 80, 2245 (1998).
[CrossRef]

1993

H. Huang and J. Eberly, J. Mod. Opt. 40, 915 (1993).
[CrossRef]

Albota, M. A.

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

Ansari, V.

Antonelli, C.

M. Brodsky, E. C. George, C. Antonelli, and M. Shtaif, Opt. Lett. 36, 43 (2011).
[CrossRef]

C. Antonelli, M. Shtaif, and M. Brodsky, Phys. Rev. Lett. 106, 080404 (2011).
[CrossRef]

Baek, B.

Bahgat Shehata, A.

A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
[CrossRef]

Banaszek, K.

P. Kolenderski, W. Wasilewski, and K. Banaszek, Phys. Rev. A 80, 013811 (2009).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Benichi, H.

Bennink, R. S.

Brecht, B.

Brodsky, M.

M. Brodsky, E. C. George, C. Antonelli, and M. Shtaif, Opt. Lett. 36, 43 (2011).
[CrossRef]

C. Antonelli, M. Shtaif, and M. Brodsky, Phys. Rev. Lett. 106, 080404 (2011).
[CrossRef]

Calkins, B.

Ceré, A.

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

Christ, A.

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, Phys. Rev. Lett. 106, 013603 (2011).
[CrossRef]

Chuang, I. L.

M. A. Nielsen and I. L. Chuang, Quantum Computation and Quantum Information, 1st ed. (Cambridge University, 2000).

Dayan, B.

B. Dayan, Phys. Rev. A 76, 043813 (2007).
[CrossRef]

B. Dayan, A. Pe’Er, A. A. Friesem, and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005).
[CrossRef]

Della Frera, A.

A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
[CrossRef]

Dirmeier, T.

Dorenbos, S.

Eberly, J.

H. Huang and J. Eberly, J. Mod. Opt. 40, 915 (1993).
[CrossRef]

Eckstein, A.

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, Phys. Rev. Lett. 106, 013603 (2011).
[CrossRef]

Erdmann, R.

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Evans, P. G.

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
[CrossRef]

Fiorentino, M.

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

Friesem, A. A.

B. Dayan, A. Pe’Er, A. A. Friesem, and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005).
[CrossRef]

Garcia-Gracia, H.

A. B. U’Ren, Y. Jeronimo-Moreno, and H. Garcia-Gracia, Phys. Rev. A 75, 023810 (2007).
[CrossRef]

George, E. C.

Gerrits, T.

Glancy, S.

Gordon, J.

J. Gordon and H. Kogelnik, Proc. Natl. Acad. Sci. USA 97, 4541 (2000).
[CrossRef]

Grice, W. P.

T. Gerrits, M. J. Stevens, B. Baek, B. Calkins, A. Lita, S. Glancy, E. Knill, S. W. Nam, R. P. Mirin, R. H. Hadfield, R. S. Bennink, W. P. Grice, S. Dorenbos, T. Zijlstra, T. Klapwijk, and V. Zwiller, Opt. Express 19, 24434 (2011).
[CrossRef]

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Y.-H. Kim and W. P. Grice, J. Mod. Opt. 49, 2309 (2002).
[CrossRef]

Hadfield, R. H.

Harder, G.

Hendrych, M.

Huang, H.

H. Huang and J. Eberly, J. Mod. Opt. 40, 915 (1993).
[CrossRef]

Humble, T. S.

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
[CrossRef]

Jennewein, T.

Jeronimo-Moreno, Y.

A. B. U’Ren, Y. Jeronimo-Moreno, and H. Garcia-Gracia, Phys. Rev. A 75, 023810 (2007).
[CrossRef]

Jin, R.-B.

Kärtner, F. X.

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

Kim, Y.-H.

Y.-H. Kim and W. P. Grice, J. Mod. Opt. 49, 2309 (2002).
[CrossRef]

Klapwijk, T.

Knill, E.

Kogelnik, H.

J. Gordon and H. Kogelnik, Proc. Natl. Acad. Sci. USA 97, 4541 (2000).
[CrossRef]

Kolenderski, P.

T. Lutz, P. Kolenderski, and T. Jennewein, Opt. Lett. 38, 697 (2013).
[CrossRef]

P. Kolenderski, W. Wasilewski, and K. Banaszek, Phys. Rev. A 80, 013811 (2009).
[CrossRef]

Kurimura, S.

O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
[CrossRef]

Kurtsiefer, C.

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

Kuzucu, O.

O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
[CrossRef]

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

Lamas-Linares, A.

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

Lim, J.

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

Lita, A.

Lum, C. Y.

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

Lundeen, J. S.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

Lutz, T.

T. Lutz, P. Kolenderski, and T. Jennewein, Opt. Lett. 38, 697 (2013).
[CrossRef]

T. Lutz, “Entangled photon sources for ultra-long distance quantum entanglement distribution,” Master’s thesis (University of Waterloo, Ulm University, 2013).

Marcikic, I.

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

Marquardt, C.

Micuda, M.

Mirin, R. P.

Molina-Terriza, G.

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

Mosley, P. J.

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, Phys. Rev. Lett. 106, 013603 (2011).
[CrossRef]

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

Munro, W. J.

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

Nam, S. W.

Nemoto, K.

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

Nielsen, M. A.

M. A. Nielsen and I. L. Chuang, Quantum Computation and Quantum Information, 1st ed. (Cambridge University, 2000).

Osorio, C. I.

C. I. Osorio, A. Valencia, and J. P. Torres, New J. Phys. 10, 113012 (2008).
[CrossRef]

Pe’Er, A.

B. Dayan, A. Pe’Er, A. A. Friesem, and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005).
[CrossRef]

Poh, H. S.

H. S. Poh, J. Lim, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 80, 043815 (2009).
[CrossRef]

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

Raymer, M. G.

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Sasaki, M.

Scarcella, C.

A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
[CrossRef]

Schaake, J.

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake, Phys. Rev. Lett. 105, 253601 (2010).
[CrossRef]

Shi, X.

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

Shimizu, R.

Shtaif, M.

C. Antonelli, M. Shtaif, and M. Brodsky, Phys. Rev. Lett. 106, 080404 (2011).
[CrossRef]

M. Brodsky, E. C. George, C. Antonelli, and M. Shtaif, Opt. Lett. 36, 43 (2011).
[CrossRef]

Silberberg, Y.

B. Dayan, A. Pe’Er, A. A. Friesem, and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005).
[CrossRef]

Silberhorn, C.

G. Harder, V. Ansari, B. Brecht, T. Dirmeier, C. Marquardt, and C. Silberhorn, Opt. Express 21, 13975 (2013).
[CrossRef]

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, Phys. Rev. Lett. 106, 013603 (2011).
[CrossRef]

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Smith, B. J.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

Stevens, M. J.

Thew, R. T.

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

Torres, J. P.

C. I. Osorio, A. Valencia, and J. P. Torres, New J. Phys. 10, 113012 (2008).
[CrossRef]

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

M. Hendrych, M. Micuda, and J. P. Torres, Opt. Lett. 32, 2339 (2007).
[CrossRef]

Tosi, A.

A. Tosi, A. Della Frera, A. Bahgat Shehata, and C. Scarcella, Rev. Sci. Instrum. 83, 013104 (2012).
[CrossRef]

Tovstonog, S.

O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
[CrossRef]

U’Ren, A. B.

A. B. U’Ren, Y. Jeronimo-Moreno, and H. Garcia-Gracia, Phys. Rev. A 75, 023810 (2007).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

URen, A. B.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

Valencia, A.

C. I. Osorio, A. Valencia, and J. P. Torres, New J. Phys. 10, 113012 (2008).
[CrossRef]

A. Valencia, A. Ceré, X. Shi, G. Molina-Terriza, and J. P. Torres, Phys. Rev. Lett. 99, 243601 (2007).
[CrossRef]

Wakui, K.

Walmsley, I. A.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

Wasilewski, W.

P. Kolenderski, W. Wasilewski, and K. Banaszek, Phys. Rev. A 80, 013811 (2009).
[CrossRef]

Wasylczyk, P.

P. J. Mosley, J. S. Lundeen, B. J. Smith, P. Wasylczyk, A. B. URen, C. Silberhorn, and I. A. Walmsley, Phys. Rev. Lett. 100, 133601 (2008).
[CrossRef]

White, A. G.

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

Wong, F. N.

O. Kuzucu, M. Fiorentino, M. A. Albota, F. N. Wong, and F. X. Kärtner, Phys. Rev. Lett. 94, 083601 (2005).
[CrossRef]

Wong, F. N. C.

O. Kuzucu, F. N. C. Wong, S. Kurimura, and S. Tovstonog, Phys. Rev. Lett. 101, 153602 (2008).
[CrossRef]

Wootters, W. K.

W. K. Wootters, Phys. Rev. Lett. 80, 2245 (1998).
[CrossRef]

Zijlstra, T.

Zwiller, V.

J. Mod. Opt.

Y.-H. Kim and W. P. Grice, J. Mod. Opt. 49, 2309 (2002).
[CrossRef]

H. Huang and J. Eberly, J. Mod. Opt. 40, 915 (1993).
[CrossRef]

Laser Phys.

A. B. U’Ren, C. Silberhorn, K. Banaszek, I. A. Walmsley, R. Erdmann, W. P. Grice, and M. G. Raymer, Laser Phys. 15, 146 (2005).

New J. Phys.

C. I. Osorio, A. Valencia, and J. P. Torres, New J. Phys. 10, 113012 (2008).
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. A

H. S. Poh, C. Y. Lum, I. Marcikic, A. Lamas-Linares, and C. Kurtsiefer, Phys. Rev. A 75, 043816 (2007).
[CrossRef]

R. T. Thew, K. Nemoto, A. G. White, and W. J. Munro, Phys. Rev. A 66, 012303 (2002).
[CrossRef]

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Figures (3)

Fig. 1.
Fig. 1.

Experimental setup. The BBO crystal is pumped using a Ti:Sapphire laser. The beam is focused onto the crystal by a lens (L3). Downconverted photons are collimated using lenses (L2, f=25cm). The retroreflectors are used to adjust the distances the extraordinary and ordinary photon travel. A half-wave plate (HWP) rotates the polarization by 90 deg, which results in splitting both photons at the PBS. After they pass polarizers (P), they are coupled into single-mode fiber (SMF-28e) by aspheric lenses (L1, f=15.4mm). The stray light is filtered out by a long-pass filter (Semrock BLP01-1319R-25). Photons are detected using two InGaAs/InP detectors D2 (Micro-Photon-Devices, InGaAs/InP single-photon avalanche diode [26]) and D3 (idQuantique, id201). Timing analysis is performed using FPGA electronics. A small percentage of the pump light is directed to a photodiode (DET10A) D1 using a glass plate (GP), a coupling lens (L4), and a SMF at 800 nm. D1 is used to measure pump pulse time.

Fig. 2.
Fig. 2.

Measured joint spectral functions for pump durations of (a) 70 fs, acquired for 71 min, and (b) 98 fs, acquired for 43 min. (c) Measurement taken with a continuous pump laser (CW) pump, acquired for 28 min. The contour lines correspond to the theoretical prediction.

Fig. 3.
Fig. 3.

Measured polarization entanglement interference fringes in (a) HV and (b) AD basis for a pump pulse duration of τp=98fs. (c) Real and (d) imaginary part of tomographically reconstructed polarization state produced by the source when pumped with τp=98fs pulses. The fidelity between the measured state and the expected entangled state (HH+VV)/2 is 0.94 (without background subtraction). The entanglement monotone (concurrence) is found to be 0.75.

Tables (1)

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Table 1. Measured Spectral and Polarization Characteristics of Photon Pairs Generated by the Sourcea

Equations (2)

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ψ(νs,νi)=Nexp((νsνi)2σ2)exp((νs+νi)2τp24).
r=1/4τp2σ21/4τp2+σ2.

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