A device for feasible fidelity, purity, Hilbert-Schmidt distance and entanglement witness measurements

Details A device for feasible fidelity, purity, Hilbert-Schmidt distance and entanglement witness measurements A device for feasible fidelity, purity, Hilbert-Schmidt distance and entanglement witness measurements

2001-08-27

arxiv.org/abs/quant-ph/0108119v1

Phys. Rev. A 65, 062320 (2002)

Physics

Quantum Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevA.65.062320

A generic model of measurement device which is able to directly measure commonly used quantum-state characteristics such as fidelity, overlap, purity and Hilbert-Schmidt distance for two general uncorrelated mixed states is proposed. In addition, for two correlated mixed states, the measurement realizes an entanglement witness for Werner's separability criterion. To determine these observables, the estimation only one parameter - the visibility of interference, is needed. The implementations in cavity QED, trapped ion and electromagnetically induced transparency experiments are discussed.

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