Reduction Theorems for Optimal Unambiguous State Discrimination of Density Matrices

Details Reduction Theorems for Optimal Unambiguous State Discrimination of Density Matrices Reduction Theorems for Optimal Unambiguous State Discrimination of Density Matrices

2003-04-28

arxiv.org/abs/quant-ph/0304179v2

Physical Review A 68, 022308 (2003)

Physics

Quantum Physics

6 pages, 1 figure

Scientific paper

10.1103/PhysRevA.68.022308

We present reduction theorems for the problem of optimal unambiguous state discrimination (USD) of two general density matrices. We show that this problem can be reduced to that of two density matrices that have the same rank $n$ and are described in a Hilbert space of dimensions $2n$. We also show how to use the reduction theorems to discriminate unambiguously between N mixed states (N \ge 2).

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