Quantum-controlled measurement device for quantum-state discrimination

DUŠEK, Miloslav and Vladimír BŮŽEK. Quantum-controlled measurement device for quantum-state discrimination. Physical Review A (Atomic, Molecular, and Optical Physics). 2002, vol. 66, 20/08/2002, p. 022112-1; 022112-5, 5 pp. ISSN 1094-1622.

Basic information

Original name

Quantum-controlled measurement device for quantum-state discrimination

Authors

DUŠEK, Miloslav (203 Czech Republic) and Vladimír BŮŽEK (703 Slovakia, guarantor)

Edition

Physical Review A (Atomic, Molecular, and Optical Physics), 2002, 1094-1622

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Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10301 Atomic, molecular and chemical physics

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Organization unit

Faculty of Informatics

UT WoS

000177872600020

Keywords in English

quantum measurement; quantum processors

Tags

Quantum measurement, quantum processors

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Abstract

V originále

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.