Unambiguous comparison of ensembles of quantum states

Investor logo

Warning

This publication doesn't include Faculty of Economics and Administration. It includes Faculty of Informatics. Official publication website can be found on muni.cz.
Authors

SEDLAK Michal ZIMAN Mário BUŽEK Vladimír HILLERY Mark

Year of publication 2008
Type Article in Periodical
Magazine / Source Physical Review A (Atomic, Molecular, and Optical Physics)
MU Faculty or unit

Faculty of Informatics

Citation
Field Information theory
Keywords quantum information; quantum estimation
Description We present a solution of the problem of the optimal unambiguous comparison of two ensembles of unknown quantum states (psi_1)^k and (psi_2)^l. We consider two cases: 1) The two unknown states psi_1 and psi_2 are arbitrary states of qudits. 2) Alternatively, they are coherent states of a harmonic oscillator. For the case of coherent states we propose a simple experimental realization of the optimal "comparison" machine composed of a finite number of beam-splitters and a single photodetector.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.