Robust control of quantum systems by quantum systems
- URL: http://arxiv.org/abs/2012.01998v1
- Date: Thu, 3 Dec 2020 15:22:37 GMT
- Title: Robust control of quantum systems by quantum systems
- Authors: Thomas Konrad, Amy Rouillard, Michael Kastner and Hermann Uys
- Abstract summary: coherent quantum control is deterministic, is less noisy than measurement-based feedback control, and has potential applications in a variety of quantum technologies.
We introduce a coherent feedback protocol, consisting of a sequence of identical interactions with controlling quantum systems.
We provide 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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- 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 stabilise 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
provide 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.
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