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- W3216396959 abstract "Quantum systems can be controlled by other quantum systems in a reversible way, without any information leaking to the outside of the system-controller compound. Such coherent quantum control is deterministic, is less noisy than measurement-based feedback control, and has potential applications in a variety of quantum technologies, including quantum computation, quantum communication, and quantum metrology. Here we introduce a coherent feedback protocol, consisting of a sequence of identical interactions with controlling quantum systems, that steers a quantum system from an arbitrary initial state towards a target state. We determine the broad class of such coherent feedback channels that achieve convergence to the target state, and then stabilize as well as protect it against noise. Our results imply that also weak system-controller interactions can counter noise if they occur with suitably high frequency. We present an example of a control scheme that does not require knowledge of the target state encoded in the controllers, which could be the result of a quantum computation. It thus provides a mechanism for autonomous, purely quantum closed-loop control." @default.
- W3216396959 created "2021-12-06" @default.
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- W3216396959 date "2021-11-22" @default.
- W3216396959 modified "2023-10-12" @default.
- W3216396959 title "Robust control of quantum systems by quantum systems" @default.
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- W3216396959 doi "https://doi.org/10.1103/physreva.104.052614" @default.
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