Phys. Rev. A 54, 2728–2736 (1996)Optimum decision scheme with a unitary control process for binary quantum-state signalsReceived 18 December 1995; published in the issue dated October 1996 A scheme for distinguishing between binary signals of nonorthogonal coherent states with the minimum average error is proposed. In contrast to the well-known Dolinar scheme, it does not use a feedback process. Instead, it achieves the same minimum error bound by only unitary transformations and photon number counting. It is shown that the required transformation should produce the appropriate Schrödinger-cat states. An example of the Hamiltonian generating such a process is derived from a multiphoton nonlinear optical process. © 1996 The American Physical Society. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.54.2728
DOI:
10.1103/PhysRevA.54.2728
PACS:
42.50.Lc
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