Optimality of feedback control strategies for qubit purification

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dc.creatorWiseman, Howard M.
dc.creatorBouten, Luc
dc.date2007-07-20
dc.date2007-07-25
dc.date.accessioned2026-07-07T09:48:55Z
dc.date.available2026-07-07T09:48:55Z
dc.descriptionRecently two papers [K. Jacobs, Phys. Rev. A {\bf 67}, 030301(R) (2003); H. M. Wiseman and J. F. Ralph, New J. Physics {\bf 8}, 90 (2006)] have derived control strategies for rapid purification of qubits, optimized with respect to various goals. In the former paper the proof of optimality was not mathematically rigorous, while the latter gave only heuristic arguments for optimality. In this paper we provide rigorous proofs of optimality in all cases, by applying simple concepts from optimal control theory, including Bellman equations and verification theorems.
dc.description6 pages. very minor improvements
dc.identifierhttps://arxiv.org/abs/0707.3001
dc.identifierhttp://arxiv.org/abs/0707.3001
dc.identifierQuantum Information Processing 7 (2008) 71-83
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/164390
dc.subjectQuantum Physics
dc.titleOptimality of feedback control strategies for qubit purification
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