Minimum-error multiple state discrimination constrained by the no-signaling principle

Details Minimum-error multiple state discrimination constrained by the no-signaling principle Minimum-error multiple state discrimination constrained by the no-signaling principle

2009-09-07

arxiv.org/abs/0909.1149v2

J. Math. Phys. 51, 022202 (2010)

Physics

Quantum Physics

6 pages, 1 figure

Scientific paper

10.1063/1.3298647

We provide a bound on the minimum error when discriminating among quantum states, using the no-signaling principle. The bound is general in that it depends on neither dimensions nor specific structures of given quantum states to be discriminated among. We show that the bound is tight for the minimum-error state discrimination between symmetric (both pure and mixed) qubit states. Moreover, the bound can be applied to a set of quantum states for which the minimum-error state discrimination is not known yet. Finally, our results strengthen the quantitative connection between two no-go theorems, the no-signaling principle and the no perfect state estimation.

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