Quantum metrology assisted by abstention
Gendra Casalí, Bernat (Universitat Autònoma de Barcelona. Departament de Física)
Ronco Bonvehi, Elio (Universitat Autònoma de Barcelona. Departament de Física)
Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física)
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física)
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Date:	2013
Abstract:	The main goal of quantum metrology is to obtain accurate values of physical parameters using quantum probes. In this context, we show that abstention, i. e. , the possibility of getting an inconclusive answer at readout, can drastically improve the measurement precision and even lead to a change in its asymptotic behavior, from the shot-noise to the Heisenberg scaling. We focus on phase estimation and quantify the required amount of abstention for a given precision. We also develop analytical tools to obtain the asymptotic behavior of the precision and required rate of abstention for arbitrary pure states.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review letters, Vol. 110, Issue 10 (March 2013) , p. 100501-1-100501-5, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.110.100501

5 p, 155.3 KB

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