Entangled photons from the polariton vacuum in a switchable optical cavity

Adrian Auer and Guido Burkard
Phys. Rev. B 85, 235140 – Published 21 June 2012

Abstract

We study theoretically the entanglement of two-photon states in the ground state of the intersubband cavity system, i.e., the so-called polariton vacuum. The system consists of a sequence of doped quantum wells located inside a microcavity and the photons can interact with intersubband excitations inside the quantum wells. Using an explicit solution for the ground state of the system, operated in the ultrastrong-coupling regime, a postselection is introduced, where only certain two-photon states are considered and analyzed for mode entanglement. We find that a fast quench of the coupling creates entangled photons and that the degree of entanglement depends on the absolute values of the in-plane wave vectors of the photons. Maximally entangled states can be generated by choosing the appropriate modes in the postselection.

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  • Received 14 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.235140

©2012 American Physical Society

Authors & Affiliations

Adrian Auer* and Guido Burkard

  • Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

  • *adrian.auer@uni-konstanz.de

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Issue

Vol. 85, Iss. 23 — 15 June 2012

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