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arXiv 1111.6229cond-mat.stat-mech
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孤立系多测量反馈的量子Jarzynski等式

Quantum Jarzynski Equality with multiple measurement and feedback for isolated system

Shubhashis Rana, Sourabh Lahiri, A. M. Jayannavar

摘要:

在本文中,我们推导出Jarzynski等式(JE)在三种不同的情况下,一个孤立的量子系统:(i)的完整的发展是酉没有中间测量,(ii)与中间测量的任意可观的执行,和(iii)与中间测量的结果被用来修改外部协议(反馈)。我们假设测量将涉及本质上纯经典的误差。我们的治疗是基于路径概率在状态空间中的每个实现。这与基于投影算子和密度矩阵的形式化方法不同。我们发现,在第二种情况下,JE保持不受影响,但在第三种情况下,测量值与实际本征值之间的互信息必须被纳入关系得到修改。

英文摘要:

In this paper, we derive the Jarzynski equality (JE) for an isolated quantum system in three different cases: (i) the full evolution is unitary with no intermediate measurements, (ii) with intermediate measurements of arbitrary observables being performed, and (iii) with intermediate measurements whose outcomes are used to modify the external protocol (feedback). We assume that the measurements will involve errors that are purely classical in nature. Our treatment is based on path probability in state space for each realization. This is in contrast to the formal approach based on projection operator and density matrices. We find that the JE remains unaffected in the second case, but gets modified in the third case where the mutual information between the measured values with the actual eigenvalues must be incorporated into the relation.

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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