Confidence and backaction in the quantum filter equation

Confidence and backaction in the quantum filter equation
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量子滤波器方程中的置信度和反作用

DOI:
10.1103/physreva.86.052320
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发表时间:
2012-07
期刊:
影响因子:
2.9
通讯作者:
Nori, Franco
Nori, Franco
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cui, Wei;Lambert, Neill;Ota, Yukihiro;Lu, Xin-You;Xiang, Z. -L.;You, J. Q.;Nori, Franco

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我们研究基于连续弱测量和量子滤波器方程的状态重建的置信度和反作用。作为物理示例,我们使用由量子点接触连续监测的双量子点的传统模型。我们检查从测量记录构建的状态估计的置信度,以及该测量的反作用对该状态的影响。最后,在一般测量的情况下,我们表明使用相对熵作为置信度的度量使我们能够将置信度的下限定义为一种量子不一致。
We study the confidence and backaction of state reconstruction based on a continuous weak measurement and the quantum filter equation. As a physical example we use the traditional model of a double quantum dot being continuously monitored by a quantum point contact. We examine the confidence of the estimate of a state constructed from the measurement record, and the effect of backaction of that measurement on that state. Finally, in the case of general measurements we show that using the relative entropy as a measure of confidence allows us to define the lower bound on the confidence as a type of quantum discord.
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发表时间: 1993
期刊: --
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