Compatibility of quantum states

Details Compatibility of quantum states Compatibility of quantum states

2002-05-07

arxiv.org/abs/quant-ph/0205033v1

Phys. Rev. A 67, 010101(R) (2003)

Physics

Quantum Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevA.67.010101

We introduce a measure of the compatibility between quantum states--the
likelihood that two density matrices describe the same object. Our measure is
motivated by two elementary requirements, which lead to a natural definition.
We list some properties of this measure, and discuss its relation to the
problem of combining two observers' states of knowledge.

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