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arXiv · 1311.3507

Spectrum and entanglement of phonons in quantum fluids of light

Xavier Busch·Iacopo Carusotto·Renaud Parentani
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Abstract

We study the quantum state of phonons propagating on top of a fluid of light coherently generated in a planar microcavity device by a quasi-resonant incident laser beam. In the steady-state under a monochromatic pump, because of the finite radiative lifetime of photons, a sizable incoherent population of low frequency phonons is predicted to appear. Their mean occupation number differs from a Planck distribution and is independent on the photon lifetime. When the photon fluid is subjected to a sudden change of its parameters, additional phonon pairs are created in the fluid with remarkable two-mode squeezing and entanglement properties. Schemes to assess non-separability of the phonon state from measurements of the correlation functions of the emitted light are discussed.

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Xavier Busch, Iacopo Carusotto, Renaud Parentani. 2014-04-25. Spectrum and entanglement of phonons in quantum fluids of light. https://doi.org/10.1103/physreva.89.043819

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