We report a Bell state preparation experiment using polarization-entangled photon pairs which are produced by spontaneous parametric down conversion of a 405 nm pulse laser beam inside two orthogonally oriented 0.1 mm beta-barium borate nonlinear crystals with Type-I phased matching. The degree and phase of all four Bell states are easily tunable. With two-photon interference visibilities in excess of 85%, we observe that the Bell parameter S for any of the four Bell states exceeds the classical limit in the Clauser–Horne–Shimony–Holt form of Bell inequality by five standard deviations.We report a Bell state preparation experiment using polarization-entangled photon pairs which are produced by spontaneous parametric down conversion of a 405 nm pulse laser beam inside two orthogonally oriented 0.1 mm beta-barium borate nonlinear crystals with Type-I phased matching. The degree and phase of all four Bell states are easily tunable. With two-photon interference visibilities in excess of 85%, we observe that the Bell parameter S for any of the four Bell states exceeds the classical limit in the Clauser–Horne–Shimony–Holt form of Bell inequality by five standard deviations.

Physics ProcediaJul 1, 20090 citations

Cavity-enhanced generation of polarization-entangled photon pairs

Markus Oberparleiter, Harald Weinfurter

Optics CommunicationsSep 1, 200032 citations

Optimal generation of pulsed entangled photon pairs

Juan F. Hodelin, G. Khoury, Dirk Bouwmeester

We experimentally investigate a double-pass parametric down-conversion scheme for producing pulsed, polarization-entangled photon pairs with high visibility. The amplitudes for creating photon pairs on each pass interfere to compensate for distinguishing characteristics that normally degrade two-photon visibility. The result is a high-flux source of polarization-entangled photon pulses that does not require spectral filtering. We observe quantum interference visibility of over 95% without the use of spectral filters for $200\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ pulses, and up to 98.1% with $5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ bandwidth filters.We experimentally investigate a double-pass parametric down-conversion scheme for producing pulsed, polarization-entangled photon pairs with high visibility. The amplitudes for creating photon pairs on each pass interfere to compensate for distinguishing characteristics that normally degrade two-photon visibility. The result is a high-flux source of polarization-entangled photon pulses that does not require spectral filtering. We observe quantum interference visibility of over 95% without the use of spectral filters for $200\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ pulses, and up to 98.1% with $5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ bandwidth filters.

arXiv:quant-ph/0604051Physical Review AJul 6, 200621 citations

Generation of a pulsed polarization entangled photon pair using a Sagnac interferometer

Bao‐Sen Shi, Akihisa Tomita

In this paper, we report on a scheme to generate a pulsed polarization entangled photon pair through the use of a Sagnac interferometer. To demonstrate its workability, we experimentally obtained two-photon quantum interference for the polarization variable. The main advantage of this scheme is its exceptional stability, compared to other schemes based on the interferometric technique. It does not need any active or passive techniques to stabilize the interferometer, even the instrument is exposed to a relatively turbulent environment.In this paper, we report on a scheme to generate a pulsed polarization entangled photon pair through the use of a Sagnac interferometer. To demonstrate its workability, we experimentally obtained two-photon quantum interference for the polarization variable. The main advantage of this scheme is its exceptional stability, compared to other schemes based on the interferometric technique. It does not need any active or passive techniques to stabilize the interferometer, even the instrument is exposed to a relatively turbulent environment.

Physical Review AJan 9, 2004127 citations

Efficient Generation of Polarization-Entangled Photon Pairs with a Laser Diode Source

Christian Kurtsiefer, Markus Oberparleiter, Jürgen Volz +1 more

Springer eBooksJan 1, 20020 citations

200\phantom{\rule{0.3em}{0ex}}\mathrm{fs}

pulses, and up to 98.1% with

5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

bandwidth filters.