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We investigate experimentally the nonlocal phase modulation ofmultiple-frequency-mode, continuous-variable entangled twin beams. We use apair of electro-optical phase modulators to modulate the entangled probe andconjugate light beams produced by four-wave mixing in hot Rb vapor. A singlephase modulator in either one of the twin beams reduces the two-mode squeezingsignal, and we find that the modulations interfere nonlocally to modify thebeam correlations. The nonlocal modulation of the beams can produce quantumcorrelations among frequency modes of the multimode fields.

Nonlocal phase modulation of multimode, continuous-variable twin beams