Quantum vacuum properties of the intersubband cavity polariton field

Abstract

We present a quantum description of a planar microcavity photon mode strongly coupled to a semiconductor intersubband transition in presence of a two-dimensional electron gas. We show that, in this kind of system, the vacuum Rabi frequency $\Omega \_R$ can be a significant fraction of the intersubband transition frequency $\omega \_12$. This regime of ultra-strong light-matter coupling is enhanced for long wavelength transitions, because for a given doping density, effective mass and number of quantum wells, the ratio $\Omega \_R/\omega \_12$ increases as the square root of the intersubband emission wavelength. We characterize the quantum properties of the ground state (a two-mode squeezed vacuum), which can be tuned {\it in-situ} by changing the value of $\Omega \_R$, e.g., through an electrostatic gate. We finally point out how the tunability of the polariton quantum vacuum can be exploited to generate correlated photon pairs out of the vacuum via quantum electrodynamics phenomena reminiscent of the dynamic Casimir effect.

Final version accepted in PRB

References in corpus (4)

• Branch-entangled polariton pairs in planar microcavities and photonic wires
• Resonant cavity photon creation via the dynamical Casimir effect
• Model for resonant photon creation in a cavity with time dependent conductivity
• Criteria of quantum correlation in the measurement of continuous variables in optics

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