Replacing quantum feedback with open-loop control and quantum filtering

Feedback control protocols can stabilize and enhance the operation of quantum devices, however, unavoidable delays in the feedback loop adversely affect their performance. We introduce a quantum control methodology, combining open-loop control with quantum filtering, which is not constrained by feedback delays. For the problems studied (rapid purification and rapid measurement) we analytically derive lower bounds on the control performance that are comparable with the best corresponding bounds for feedback protocols.Feedback control protocols can stabilize and enhance the operation of quantum devices, however, unavoidable delays in the feedback loop adversely affect their performance. We introduce a quantum control methodology, combining open-loop control with quantum filtering, which is not constrained by feedback delays. For the problems studied (rapid purification and rapid measurement) we analytically derive lower bounds on the control performance that are comparable with the best corresponding bounds for feedback protocols.
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Journal Title

Physical Review A (Atomic, Molecular and Optical Physics)

Volume

Issue

DOI

https://doi.org/10.1103/PhysRevA.81.020301

Copyright Statement

© 2010 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

Subject

Mathematical sciences

Physical sciences

Quantum information, computation and communication

Chemical sciences

Publication URI

http://hdl.handle.net/10072/33182

Collection

Journal articles