Phonon-Induced Dephasing in Quantum Dot-Cavity QED

Abstract

We present a semi-analytic and asymptotically exact solution to the problem of phonon-induced decoherence in a quantum dot-microcavity system. Particular emphasis is placed on the linear polarization and optical absorption, but the approach presented herein may be straightforwardly adapted to address any elements of the exciton-cavity density matrix. At its core, the approach combines Trotter's decomposition theorem with the linked cluster expansion. The effects of the exciton-cavity and exciton-phonon couplings are taken into account on equal footing, thereby providing access to regimes of comparable polaron and polariton timescales. We show that the optical decoherence is realized by real phonon-assisted transitions between different polariton states of the quantum dot-cavity system, and that the polariton line broadening is well-described by Fermi's golden rule in the polariton frame. We also provide purely analytic approximations which accurately describe the system dynamics in the limit of longer polariton timescales.

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• Coherent Dynamics in Quantum Emitters under Dichromatic Excitation
• Non-Markovian perturbation theories for phonon effects in strong-coupling cavity quantum electrodynamics
• Electron-phonon decoupling due to strong light-matter interactions
• Exciton-photon complexes and dynamics in the concurrent strong-weak coupling regime of singular site-controlled cavity quantum electrodynamics
• Quantum Mollow Quadruplet in Non-linear Cavity-QED
• Impact of the phonon environment on the nonlinear quantum-dot-cavity QED. I. Path-integral approach
• Single site-controlled inverted pyramidal InGaAs QD-nanocavity operating at the onset of the strong coupling regime
• One-dimensional photonic wire as a single-photon source: Implications of cavity QED to a phonon bath of reduced dimensionality
• Controlling dephasing of coupled qubits via shared-bath coherence