Decoherence in semiconductor cavity QED systems due to phonon scattering

Abstract

We investigate the effect of electron-phonon interactions on the coherence properties of single photons emitted from a semiconductor cavity QED system, i.e. a quantum dot embedded in an optical cavity. The degree of indistinguishability, governing the quantum mechanical interference between two single photons, is calculated as a function of important parameters describing the cavity QED system and the phonon reservoir, e.g. cavity quality factor, light-matter coupling strength, temperature and phonon lifetime. We show that non-Markovian effects play an important role in determining the coherence properties for typical parameter values and establish the conditions under which a Markovian approximation may be applied. The calculations are performed using a recently developed second order perturbation theory, the limits of validity of which are established by comparing to an exact diagonalization approach. We find that for large cavity decay rates the perturbation theory may break down.

Corrected a few mistakes, published in PRB

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Cited by in corpus (6)

• Cavity-funneled generation of indistinguishable single photons from strongly dissipative quantum emitters
• Scattering of two photons on a quantum emitter in a one-dimensional waveguide: Exact dynamics and induced correlations
• Two-photon interference from a quantum dot--microcavity: Persistent pure-dephasing and suppression of time-jitter
• Thermodynamics of the polaron master equation at finite bias
• Influence of phonons on solid-state cavity-QED investigated using nonequilibrium Green's functions
• The universal model of strong coupling at the nonlinear parametric resonance in open cavity-QED systems