Decoherence-free evolution of time-dependent superposition states of two-level systems and thermal effects

Details Decoherence-free evolution of time-dependent superposition states of two-level systems and thermal effects Decoherence-free evolution of time-dependent superposition states of two-level systems and thermal effects

2011-09-03

arxiv.org/abs/1109.0655v1

Physical Review A 84, 012112 (2011)

Physics

Quantum Physics

7 pages, 4 figures

Scientific paper

10.1103/PhysRevA.84.012112

In this paper we detail some results advanced in a recent letter [Prado et al., Phys. Rev. Lett. 102 073008 (2009)] showing how to engineer reservoirs for two-level systems at absolute zero by means of a time-dependent master equation leading to a nonstationary superposition equilibrium state. We also present a general recipe showing how to build nonadiabatic coherent evolutions of a fermionic system interacting with a bosonic mode and investigate the influence of thermal reservoirs at finite temperature on the fidelity of the protected superposition state. Our analytical results are supported by numerical analysis of the full Hamiltonian model.

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