Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator

Abstract

We observed continuous-variable entanglement between the bright beams emitted above threshold by an ultrastable optical parametric oscillator, classically phase-locked at a frequency difference of 161.8273240(5) MHz. The amplitude-difference squeezing is -3 dB and the phase-sum one is -1.35 dB. Besides proving entanglement in a new physical system, the phase-locked OPO, such unprecedented frequency-difference stability paves the way for transferring entanglement between different optical frequencies and densely implementing continuous-variable quantum information in the frequency domain.

4 pages, 4 figures, submitted for publication

References in corpus (3)

• Continuous variable entanglement of phase locked light beams
• Non-linear and quantum optics of a type II OPO containing a birefringent element Part 2 : bright entangled beams generation
• Non-linear and quantum optics of a type II OPO containing a birefringent element Part 1: Classical operation

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• Experimental investigation to influence of pump phase fluctuation on phase-correlation of output optical fields from a non-degenerate parametric oscillator
• Dependence of quantum correlations of twin beams on pump finesse of optical parametric oscillator