Publication details
Unambiguous comparison of ensembles of quantum states
| Authors | |
|---|---|
| Year of publication | 2008 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review A (Atomic, Molecular, and Optical Physics) |
| MU Faculty or unit | |
| 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. |
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