单比特反馈与量子动力学解耦
Single-bit Feedback and Quantum Dynamical Decoupling
摘要：
在受到不需要的幺正或非幺正动力学影响的目标系统中合成有效的身份演化是量子控制和量子信息处理应用的基本任务。在这里，我们研究如何单比特，离散时间的反馈能力，可以利用制定或增强量子程序，有效地抑制不必要的动力学在有限维开放量子系统。给出了任意演化时间下可由单比特反馈校正的联合酉传播子的显式特征。对于一个二维目标系统，我们展示了如何通过适当地结合量子反馈与动态解耦方法，级联反馈解耦方案可以建立，它可以在放松的控制假设下运行，可以优于纯闭环和开环协议。
英文摘要：
Synthesizing an effective identity evolution in a target system subjected to unwanted unitary or non-unitary dynamics is a fundamental task for both quantum control and quantum information processing applications. Here, we investigate how single-bit, discrete-time feedback capabilities may be exploited to enact or to enhance quantum procedures for effectively suppressing unwanted dynamics in a finite-dimensional open quantum system. An explicit characterization of the joint unitary propagators correctable by a single-bit feedback strategy for arbitrary evolution time is obtained. For a two-dimensional target system, we show how by appropriately combining quantum feedback with dynamical decoupling methods, concatenated feedback-decoupling schemes may be built, which can operate under relaxed control assumptions and can outperform purely closed-loop and open-loop protocols.
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