Two-color continuous-variable quantum entanglement in a singly resonant optical parametric oscillator

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.043810· OSTI ID:22093366

Cuozzo, Domenico; Oppo, Gian-Luca ^[1]

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1. ICS, SUPA, and Department of Physics, University of Strathclyde, Glasgow G4 ONG, Scotland (United Kingdom)

We apply the input-output theory of optical cavities to formulate a quantum treatment of a continuous-wave singly resonant optical parametric oscillator. This case is mainly relevant to highly nondegenerate signal and idler modes. We show that both intensity and quadrature squeezing are present and that the maximum noise reduction below the standard quantum limit is the same at the signal and idler frequencies as in the doubly resonant case. As the threshold of oscillation is approached, however, the intensity-difference and quadrature spectra display a progressive line narrowing which is absent in the balanced doubly resonant case. By use of the separability criterion for continuous variables, the signal-idler state is found to be entangled over wide ranges of the parameters. We show that attainable levels of squeezing and entanglement make singly resonant configurations ideal candidates for two-color quantum information processes, because of their ease of tuning in experimental realizations.

• OSTI ID: 22093366
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COLOR
LINE NARROWING
NOISE
OSCILLATIONS
PARAMETRIC OSCILLATORS
QUADRATURES
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUANTUM MECHANICS