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We observed continuous-variable entanglement between the bright beams emittedabove threshold by an ultrastable optical parametric oscillator, classicallyphase-locked at a frequency difference of 161.8273240(5) MHz. Theamplitude-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 fortransferring entanglement between different optical frequencies and denselyimplementing continuous-variable quantum information in the frequency domain.Comment: 4 pages, 4 figures, submitted for publicatio

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