Unambiguous comparison of ensembles of quantum states

Details Unambiguous comparison of ensembles of quantum states Unambiguous comparison of ensembles of quantum states

2007-12-11

arxiv.org/abs/0712.1616v1

Phys. Rev. A 77, 042304 (2008)

Physics

Quantum Physics

7 pages, 3 figures

Scientific paper

10.1103/PhysRevA.77.042304

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.

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