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arXiv 2009.04152quant-ph
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耦合到一个或多个费米玻色热浴的费米玻色系统的非马尔可夫模型

Non-Markovian modeling of Fermi-Bose systems coupled to one or several Fermi-Bose thermal baths

Denis Lacroix, V. V. Sargsyan, G. G. Adamian, N. V. Antonenko, A. A. Hovhannisyan

摘要:

提出了一种方法来描述耦合到一个或多个由费米子和/或玻色子组成的热浴的费米或玻色系统。该方法,称为耦合运动方程方法,适当地包括非马尔可夫效应。该方法是准确的,在全耦合近似时,只有玻色子粒子存在于系统和浴。该方法提供了一个近似的处理时,费米子存在于系统中和/或在一个或几个环境中。新方法的优点是在演化过程中适当尊重费米子的泡利不相容原理。我们说明的方法耦合到一个或两个热浴假设不同类型的量子统计(费米子或玻色子)的单个费米或玻色两能级系统。详细分析了费米系统与费米子热浴或玻色子热浴或两者混合热浴耦合的情况。随着未来的目标,以治疗费米系统形成的越来越多的两个能级系统(量子比特),我们讨论了可能的简化,可以在运动方程及其有效性的限制方面的系统-浴耦合或初始热浴温度。

英文摘要:

A method is proposed to describe Fermi or Bose systems coupled to one or several heat baths composed of fermions and/or bosons. The method, called Coupled Equations of Motion method, properly includes non-Markovian effects. The approach is exact in the Full-Coupling approximation when only bosonic particles are present in the system and baths. The approach provides an approximate treatment when fermions are present either in the system and/or in one or several environments. The new approach has the advantage to properly respect the Pauli exclusion principle for fermions during the evolution. We illustrate the approach for the single Fermi or Bose two-level system coupled to one or two heat-baths assuming different types of quantum statistics (Fermion or Bosons) for them. The cases of Fermi system coupled to fermion or boson heat baths or a mixture of both are analyzed in details. With the future goal to treat Fermi systems formed of increasing number of two-level systems (Qubits), we discuss possible simplifications that could be made in the equations of motion and their limits of validity in terms of the system--baths coupling or of the initial heat baths temperatures.

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