Scientific Results

Spectrum and entanglement of phonons in quantum fluids of light

Year: 2014

Authors: Busch X., Carusotto I., Parentani R.

Autors Affiliation: Laboratoire de Physique Thèorique, CNRS UMR 8627, Bâtiment 210, Universite Paris-Sud 11, 91405 Orsay CEDEX, France; INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, via Sommarive 14, 38123 Povo, Italy

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 quasiresonant 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 of 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 the nonseparability of the phonon state from measurements of the correlation functions of the emitted light are discussed.


Volume: 89 (4)      Pages from: 043819  to: 043819

More Information: We are grateful to R. Balbinot, D. Gerace, S. Finazzi, and M. Wouters for useful discussions. We also thank S. Robertson and F. Michel for interesting discussions and a careful reading of the manuscript. This work has been supported by ERC through a QGBE Grant and by Provincia Autonoma di Trento. It has also been supported by the French National Research Agency under the Program Investing in the Future Grant No. ANR-11-IDEX-0003-02 associated with the project QEAGE (\”Quantum Effects in Analogue Gravity Experiments\”).
DOI: 10.1103/PhysRevA.89.043819

Citations: 29
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