Resonance fluorescence in a band gap material: Direct numerical simulation of non-Markovian evolution

Abstract

A numerical method of calculating the non-Markovian evolution of a driven atom radiating into a structured continuum is developed. The formal solution for the atomic reduced density matrix is written as a Markovian algorithm by introducing a set of additional, virtual density matrices which follow, to the level of approximation of the algorithm, all the possible trajectories of the photons in the electromagnetic field. The technique is perturbative in the sense that more virtual density matrices are required as the product of the effective memory time and the effective coupling strength become larger. The number of density matrices required is given by $3^M$ where $M$ is the number of timesteps per memory time. The technique is applied to the problem of a driven two-level atom radiating close to a photonic band gap and the steady-state correlation function of the atom is calculated.

14 pages, 9 figures

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• Open system dynamics with non-Markovian quantum trajectories
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• Effects of interatomic collisions on atom laser outcoupling
• Dressed Quantum Trajectories: Novel Approach to the non-Markovian Dynamics of Open Quantum Systems on a Wide Time Scale
• Information Loss Pathways in a Numerically Exact Simulation of a non-Markovian Open Quantum System