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arXiv 1012.3701quant-phgr-qchep-th
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量子力学中的退相干

Decoherence in Quantum Mechanics

Jurjen F. Koksma, Tomislav Prokopec, Michael G. Schmidt

摘要:

我们使用两种方法在一个简单的量子力学模型中研究退相干。首先,我们遵循传统的方法去相干,其中一个感兴趣的是从微扰主方程求解约化的密度矩阵。其次,我们认为我们的新的相关器的方法去相干熵是通过忽略观测不可达的干扰产生的。我们表明,这两种方法都可以准确地预测退相干时间尺度。然而,微扰主方程一般遭受不稳定性,这使我们无法可靠地计算系统的总熵增加。我们还讨论了相互作用场论的量子力学模型的结果的相关性。

英文摘要:

We study decoherence in a simple quantum mechanical model using two approaches. Firstly, we follow the conventional approach to decoherence where one is interested in solving the reduced density matrix from the perturbative master equation. Secondly, we consider our novel correlator approach to decoherence where entropy is generated by neglecting observationally inaccessible correlators. We show that both methods can accurately predict decoherence time scales. However, the perturbative master equation generically suffers from instabilities which prevents us to reliably calculate the system's total entropy increase. We also discuss the relevance of the results in our quantum mechanical model for interacting field theories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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