Saturation of repeated quantum measurements
Saturation of repeated quantum measurements
复制标题
重复量子测量的饱和
DOI：
10.1088/1751-8113/49/33/33lt01
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Y. Kuramochi
中科院分区：
文献类型：
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作者：
E. Haapasalo;T. Heinosaari;Y. Kuramochi
我们研究连续测量场景，其中系统重复地接受相同的测量过程。我们首先提供这种重复测量的例子，其中在一些有限数量的测量步骤之后，进一步重复测量不会增加我们对系统的了解。然而，我们还证明了重复Lüders对不尖锐的两结果可观量的测量在这个意义上永远不会饱和，并且我们刻画了在无限多次重复极限中测量的可观性。我们的结果表明，重复测量可以用来校正不清晰可见物体的固有噪声。
We study sequential measurement scenarios where the system is repeatedly subjected to the same measurement process. We first provide examples of such repeated measurements where further repetitions of the measurement do not increase our knowledge on the system after some finite number of measurement steps. We also prove, however, that repeating the Lüders measurement of an unsharp two-outcome observable never saturates in this sense, and we characterize the observable measured in the limit of infinitely many repetitions. Our result implies that a repeated measurement can be used to correct the inherent noise of an unsharp observable.