Entangled light in transition through the generation threshold

Details Entangled light in transition through the generation threshold Entangled light in transition through the generation threshold

2003-04-30

arxiv.org/abs/quant-ph/0304205v2

Phys. Rev. A, 69, 013813 (2004)

Physics

Quantum Physics

7 pages, 4 figures; Content changed: more details added to the discussion. To be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.69.013813

We investigate continuous variable entangling resources on the base of two-mode squeezing for all operational regimes of a nondegenerate optical parametric oscillator with allowance for quantum noise of arbitrary level. The results for the quadrature variances of a pair of generated modes are obtained by using the exact steady-state solution of Fokker-Planck equation for the complex P-quasiprobability distribution function. We find a simple expression for the squeezed variances in the near-threshold range and conclude that the maximal two-mode squeezing reaches 50% relative to the level of vacuum fluctuations and is achieved at the pump field intensity close to the generation threshold. The distinction between the degree of two-mode squeezing for monostable and bistable operational regimes is cleared up.

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