Continuous-monitoring measured signals bounded by past and future conditions in enlarged quantum systems
Continuous-monitoring measured signals bounded by past and future conditions in enlarged quantum systems
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DOI：
10.1007/s11128-019-2314-6
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发表时间：
2019-05
影响因子：
2.5
通讯作者：
Le Bin Ho
中科院分区：
文献类型：
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作者：
Le Bin Ho
在一个受过去和未来条件约束的量子系统中，弱连续监测的前向演化和后向演化量子态通常是分开进行的。因此，无法连续监测给定频率下的测量信号。在这里，我们提出了一个扩大的量子系统方法，将这两个过程联合收割机结合在一起。其中，我们引入了一个扩大的量子态，它包含了向前和向后演化的量子态。放大的状态由放大的主方程控制，并在时间上单向传播。因此，可以连续地监测在微处理器处测量的信号，并且可以在信号放大和信号处理技术中提供优势。我们的建议可以在各种物理系统上实现，例如超导电路，NMR系统，离子阱，量子光子学等。
In a quantum system that is bounded by past and future conditions, weak continuous-monitoring forward-evolving and backward-evolving quantum states are usually carried out separately. Therefore, measured signals at a given timetcannot be monitored continuously. Here, we propose anenlarged quantum systemmethod to combine these two processes together. Therein, we introduce an enlarged quantum state that contains both the forward- and backward-evolving quantum states. The enlarged state is governed by an enlarged master equation and propagates one-way forward in time. As a result, the measured signals at timetcan be monitored continuously and can provide advantages in the signals amplification and signal processing techniques. Our proposal can be implemented on various physical systems, such as superconducting circuits, NMR systems, ion traps, quantum photonics, and among others.