Stable generation of quadrature entanglement using a ring interferometer

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.79.050302· OSTI ID:21300772

Eto, Yujiro; Nonaka, Akihiro; Hirano, Takuya ^[1]; Yun, Zhang ^[2]

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1. Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo 171-8588 (Japan)
2. Department of Electronic Engineering, The University of Electro-Communications, 1-5-1 Chofu-gaoka, Chofu-shi, Tokyo 182-8585 (Japan)

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 {pi}/2, we verify the inseparability of the states by a sufficient criterion <{delta}{sup 2}[X{sub a}({phi}{sub 0})+X{sub b}({pi}-{phi}{sub 0})]>+<{delta}{sup 2}[X{sub a}({phi}{sub 0}{sup '})-X{sub b}(-{phi}{sub 0}{sup '})]>=0.64<1 where {phi}{sub 0}{sup '}-{phi}{sub 0}={pi}/2.

• OSTI ID: 21300772
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
DETECTION
INTERFEROMETERS
INTERFEROMETRY
PARAMETRIC AMPLIFIERS
PULSES
QUADRATURES
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
VISIBLE RADIATION
WAVELENGTHS