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Quantum-controlled measurement device for quantum-state discrimination

descriptionPublicationkeyboard_double_arrow_right Article 20 Aug 2002Publisher:American Physical Society (APS)Journal:Physical Review A, volume 66 (issn: 1050-2947, eissn: 1094-1622,

Authors: Vladimír Bužek; Vladimír Bužek; Miloslav Dušek;

doi: 10.1103/physreva.66.022112

Quantum-controlled measurement device for quantum-state discrimination

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Abstract

We propose a "programmable" quantum device that is able to perform a specific generalized measurement from a certain set of measurements depending on a quantum state of a "program register." In particular, we study a situation when the programmable measurement device serves for the unambiguous discrimination between nonorthogonal states. The particular pair of states that can be unambiguously discriminated is specified by the state of a program qubit. The probability of successful discrimination is not optimal for all admissible pairs. However, for some subsets it can be very close to the optimal value.

Related Organizations

Masaryk University
Czech Republic
Slovak Academy of Sciences
Slovakia
Palacký University, Olomouc
Czech Republic

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Quantum multimeters: A programmable state discriminator
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