Coherent feedback that beats all measurement-based feedback protocols

We show that when the speed of control is bounded, there is a widely applicable minimal-time control problem for which a coherent feedback protocol is optimal, and is faster than all measurement-based feedback protocols, where the latter are defined in a strict sense. The superiority of the coherent...

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Bibliographic Details
Published in:New journal of physics Vol. 16; no. 7; pp. 73036 - 73044
Main Authors: Jacobs, Kurt, Wang, Xiaoting, Wiseman, Howard M
Format: Journal Article
Language:English
Published: Bristol IOP Publishing 28.07.2014
Subjects:
03.65.Ta
03.67.-a
03.67.Pp
Coherence
Feedback
Hilbert space
Physics
quantum control
quantum measurement
quantum open systems
ISSN:1367-2630, 1367-2630
Online Access:Get full text
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Summary:We show that when the speed of control is bounded, there is a widely applicable minimal-time control problem for which a coherent feedback protocol is optimal, and is faster than all measurement-based feedback protocols, where the latter are defined in a strict sense. The superiority of the coherent protocol is due to the fact that it can exploit a geodesic path in Hilbert space, a path that measurement-based protocols cannot follow.
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ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/16/7/073036