Unambiguous identification of coherent states II: Multiple resources

Details Unambiguous identification of coherent states II: Multiple resources Unambiguous identification of coherent states II: Multiple resources

2009-01-21

arxiv.org/abs/0901.3206v1

Phys. Rev. A 79, 062305 (2009)

Physics

Quantum Physics

9 figures

Scientific paper

10.1103/PhysRevA.79.062305

We consider unambiguous identification of coherent states of electromagnetic field. In particular, we study possible generalizations of an optical setup proposed in M. Sedl\'{a}k {\it et al.}, Phys. Rev. A {\bf 76}, 022326 (2007). We show how the unambiguous identification of coherent states can be performed in a general case when multiple copies of unknown and the reference states are available. We also investigate whether reference states after the measurement can be "recovered" and further used for subsequent unambiguous identification tasks. We show that in spite of the fact that the recovered reference states are disturbed by measurements they can be repeatedly used for unambiguous identifications. We analyze the role of various imperfections in preparation of the unknown and the reference coherent states on the performance of our unambiguous identification setup.

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