Experimental realization of optimal detection strategies for overcomplete states

Details Experimental realization of optimal detection strategies for overcomplete states Experimental realization of optimal detection strategies for overcomplete states

2000-08-04

arxiv.org/abs/quant-ph/0008028v2

Phys. Rev. A (64) 012303, 2001

Physics

Quantum Physics

RevTeX4, 14 pages, 10 figures (included as eps), submitted to Phys. Rev. A. Typos corrected, Sec II B rewritten, no changes to

Scientific paper

10.1103/PhysRevA.64.012303

We present the results of generalized measurements of optical polarization designed to provide one of three or four distinct outcomes. This has allowed us to discriminate between nonorthogonal polarization states with an error probability that is close to the minimum allowed by quantum theory. Employing these optimal detection strategies on sets of three (trine) or four (tetrad) equiprobable symmetric nonorthogonal polarization states, we obtain a mutual information that exceeds the maximum value attainable using conventional (von Neumann) polarization measurements.

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