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Open Quantum Systems Decoherence

Decoherence in the Pure Dephasing Spin-Boson Model with Hermitian or Non-Hermitian Bath

arXiv
Authors: Yue-Hong Wu, Ning-Hua Tong

Year

2025

Paper ID

6009

Status

Preprint

Abstract Read

~2 min

Abstract Words

125

Citations

N/A

Abstract

In this paper, we investigate the decoherence of qubit due to its coupling to a Hermitian or a non-Hermitian bath within the pure dephasing spin-boson model. First, using this model, we analytically establish the previously anticipated similarity between the non-equilibrium and the equilibrium correlation functions Px(t) and Cx(t). Then, in the short/long time asymptotic behaviors of Px(t), we find singular dependence on A (coupling strength) and s (bath exponent) at their integer values. Finally, we find that the non-Hermitian bath tends to suppress the decoherence of qubit for all values of A and s, in contrast to the conclusion of Dey et al. . Our results show the potential of non-Hermitian environment engineering in suppressing the decoherence of qubit.

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  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
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  • In this paper, we investigate the decoherence of qubit due to its coupling to a Hermitian or a non-Hermitian bath within the pure dephasing spin-boson model.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.15297 [2] arXiv https://arxiv.org/abs/2512.15297 [3] Publisher https://arxiv.org/abs/2512.15297

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