Commutator Relations Reveal Solvable Structures in Unambiguous State Discrimination

Details Commutator Relations Reveal Solvable Structures in Unambiguous State Discrimination Commutator Relations Reveal Solvable Structures in Unambiguous State Discrimination

2007-05-23

arxiv.org/abs/0705.3391v2

J. Phys. A: Math. Theor. 40 (2007) F871-F878

Physics

Quantum Physics

5 pages, discussion of related work added

Scientific paper

10.1088/1751-8113/40/36/F04

We present a criterion, based on three commutator relations, that allows to decide whether two self-adjoint matrices with non-overlapping support are simultaneously unitarily similar to quasidiagonal matrices, i.e., whether they can be simultaneously brought into a diagonal structure with 2x2-dimensional blocks. Application of this criterion to unambiguous state discrimination provides a systematic test whether the given problem is reducible to a solvable structure. As an example, we discuss unambiguous state comparison.

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