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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 9862–9875

1.5-μm band polarization entangled photon-pair source with variable Bell states

Shin Arahira, Tadashi Kishimoto, and Hitoshi Murai  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 9862-9875 (2012)

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In this paper we report a polarization-entangled photon-pair source in a 1.5-μm band which can generate arbitrary entangled states including four maximum entangled states (Bell states) by using cascaded optical second nonlinearities (second-harmonic generation and the following spontaneous parametric down conversion) in a periodically poled LiNbO3 (PPLN) ridge-waveguide device. Exchange among the Bell states was achieved by using an optical phase bias compensator (OPBC) in a Sagnac loop interferometer and a half-wave plate outside the loop for polarization conversion. Quantitative evaluation was made on the performance of the photon-pair source through the experiments of two-photon interferences, quantum state tomography, and test of violation of Bell inequality. We observed high visibilities of 96%, fidelities of 97%, and 2.71 of the S parameter in inequality of Clauser, Horne, Shimony, and Holt (CHSH). The experimental values, including peak coincidence counts in the two-photon interference (approximately 170 counts per second), remained almost unchanged in despite of the exchange among the Bell states. They were also in good agreement with the theoretical assumption from the mean number of the photon-pairs under the test (0.04 per pulse). More detailed experimental studies on the dependence of the mean number of the photon-pairs revealed that the quantum states were well understood as the Werner state.

© 2012 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(270.4180) Quantum optics : Multiphoton processes
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

Original Manuscript: January 31, 2012
Revised Manuscript: March 2, 2012
Manuscript Accepted: March 19, 2012
Published: April 16, 2012

Shin Arahira, Tadashi Kishimoto, and Hitoshi Murai, "1.5-μm band polarization entangled photon-pair source with variable Bell states," Opt. Express 20, 9862-9875 (2012)

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