Estimating the spectrum of a density matrix with LOCC

Details Estimating the spectrum of a density matrix with LOCC Estimating the spectrum of a density matrix with LOCC

2005-06-23

arxiv.org/abs/quant-ph/0506197v3

J. Phys. A: Math. Gen. 39 (2006) 1645-1656

Physics

Quantum Physics

12 pages, uses iopart.cls and iopart10.clo. Improved version. v3: Reference updated, added journal reference

Scientific paper

10.1088/0305-4470/39/7/009

The problem of estimating the spectrum of a density matrix is considered. Other problems, such as bipartite pure state entanglement, can be reduced to spectrum estimation. A local operations and classical communication (LOCC) measurement strategy is shown which is asymptotically optimal. This means that, for a very large number of copies, it becomes unnecessary to perform collective measurements which should be more difficult to implement in practice.

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