Nonlocal phase modulation of multimode, continuous-variable twin beams

TL;DR

This paper experimentally demonstrates nonlocal phase modulation of entangled twin beams across multiple frequency modes, revealing interference effects that modify quantum correlations nonlocally.

Contribution

It introduces the first experimental observation of nonlocal phase modulation effects on multimode continuous-variable entangled beams.

Findings

Single modulator reduces two-mode squeezing signal

Modulations interfere nonlocally to alter correlations

Quantum correlations among frequency modes can be controlled

Abstract

We investigate experimentally the nonlocal phase modulation of multiple-frequency-mode, continuous-variable entangled twin beams. We use a pair of electro-optical phase modulators to modulate the entangled probe and conjugate light beams produced by four-wave mixing in hot Rb vapor. A single phase modulator in either one of the twin beams reduces the two-mode squeezing signal, and we find that the modulations interfere nonlocally to modify the beam correlations. The nonlocal modulation of the beams can produce quantum correlations among frequency modes of the multimode fields.