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

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

2006-04-18

arxiv.org/abs/quant-ph/0604134v3

PRA 74, 041804(R) (2006)

Physics

Quantum Physics

4 pages, 4 figures, submitted for publication

Scientific paper

10.1103/PhysRevA.74.041804

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.

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