Recent progress in open quantum systems: Non-Gaussian noise and decoherence in fermionic systems

Details Recent progress in open quantum systems: Non-Gaussian noise and decoherence in fermionic systems Recent progress in open quantum systems: Non-Gaussian noise and decoherence in fermionic systems

2008-09-25

arxiv.org/abs/0809.4397v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Proceedings of Ustron 2008 conference, 6 pages, 3 figures

Scientific paper

We review our recent contributions to two topics that have become of interest in the field of open, dissipative quantum systems: non-Gaussian noise and decoherence in fermionic systems. Decoherence by non-Gaussian noise, i.e. by an environment that cannot be approximated as a bath of harmonic oscillators, is important in nanostructures (e.g. qubits) where there might be strong coupling to a small number of fluctuators. We first revisit the pedagogical example of dephasing by classical telegraph noise. Then we address two models where the quantum nature of the noise becomes essential: "quantum telegraph noise" and dephasing by electronic shot noise. In fermionic systems, many-body aspects and the Pauli principle have to be taken care of when describing the loss of phase coherence. This is relevant in electronic quantum transport through metallic and semiconducting structures. Specifically, we recount our recent results regarding dephasing in a chiral interacting electron liquid, as it is realized in the electronic Mach-Zehnder interferometer. This model can be solved employing the technique of bosonization as well as a physically transparent semiclassical method.

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