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Ignorance is bliss: General and robust cancellation of decoherence via no-knowledge quantum feedback

Szigeti, S S; Carvalho, Andre; Morley, James G; Hush, Michael


A "no-knowledge" measurement of an open quantum system yields no information about any system observable; it only returns noise input from the environment. Surprisingly, performing such a no-knowledge measurement can be advantageous. We prove that a system undergoing no-knowledge monitoring has reversible noise, which can be canceled by directly feeding back the measurement signal. We show how no-knowledge feedback control can be used to cancel decoherence in an arbitrary quantum system coupled...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.113.020407


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