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Stable generation of quadrature entanglement using a ring interferometer

Yujiro Eto, Akihiro Nonaka, Yun Zhang, and Takuya Hirano
Phys. Rev. A 79, 050302(R) – Published 18 May 2009

Abstract

We propose and demonstrate a scheme to stably generate quadrature-entangled optical pulses using a ring interferometer composed of an optical parametric amplifier and a dispersive media. The entangled light pulses at telecommunication wavelength are generated by combining two squeezed beams. In our scheme, the relative phase between the two beams is kept stable by the ring interferometer and is controllable using dispersive media. The amplitude and phase quadratures of the entangled beams are measured using two time-domain pulsed homodyne detectors. When the relative phase is fixed at π/2, we verify the inseparability of the states by a sufficient criterion Δ2[X̂a(ϕ0)+X̂b(πϕ0)]+Δ2[X̂a(ϕ0)X̂b(ϕ0)]=0.64<1 where ϕ0ϕ0=π/2.

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  • Received 29 January 2009

DOI:https://doi.org/10.1103/PhysRevA.79.050302

©2009 American Physical Society

Authors & Affiliations

Yujiro Eto1,2, Akihiro Nonaka1,2, Yun Zhang3, and Takuya Hirano1,2

  • 1Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo 171-8588, Japan
  • 2CREST, Japan Science and Technology Agency, 1-9-9 Yaesu, Chuo-ku, Tokyo 103-0028, Japan
  • 3Department of Electronic Engineering, The University of Electro-Communications, 1-5-1 Chofu-gaoka, Chofu-shi, Tokyo 182-8585, Japan

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Issue

Vol. 79, Iss. 5 — May 2009

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