Geodesics and the best measurement for distinguishing quantum states

Details Geodesics and the best measurement for distinguishing quantum states Geodesics and the best measurement for distinguishing quantum states

2005-08-18

arxiv.org/abs/quant-ph/0508133v2

J. Phys. A: Math. Gen. 38 (2005) L725-L730

Physics

Quantum Physics

3 pages, replaced by published version

Scientific paper

10.1088/0305-4470/38/44/L01

From statistical distinguishability of probability distributions, one can define distinguishability of quantum states. A corresponding measurement to perform, optimal in a definite sense, for distinguishing between two given states rho_A and rho_B, has been derived by Fuchs and Caves. We show that the Bures-Uhlmann geodesic through the two states singles out this measurement. The geodesic `bounces' at the boundary of the set of quantum states. Whenever the geodesic hits the boundary, the state orthogonal to that boundary state is one of the basis states for the measurement.

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