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Open Quantum Systems Decoherence

The dynamics of a qubit in a spin-boson environment: a comparison between analytical and numerical method

arXiv

Authors: Peihao Huang, Hang Zheng, Keiichiro Nasu

Year

2010

Paper ID

10471

Status

Preprint

Abstract Read

~2 min

Abstract Words

121

Citations

N/A

Abstract

The dynamics of a qubit under the decoherence of a two level fluctuator (TLF) in addition to its coupling to a bosonic bath is investigated theoretically. Two different methods are applied and compared for this problem. One is a perturbation method based on a unitary transformation. With the merit of our unitary transformation, non-adiabatic effect can be taken into account efficiently. And the other one is the numerically exact method, namely the quasi-adiabatic path-integral (QUAPI) propagator technique. We find that the analytical method works well for a wide parameter range and show good agreement with QUAPI. On the other hand, The enhancement and the reduction of quantum decoherence of the qubit is checked with varying bath temperature T and TLF-bath coupling.

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The dynamics of a qubit under the decoherence of a two level fluctuator (TLF) in addition to its coupling to a bosonic bath is investigated theoretically.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1011.2609 [2] arXiv https://arxiv.org/abs/1011.2609 [3] Publisher https://arxiv.org/abs/1011.2609

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