Phys. Rev. A 62, 042301 (2000) [5 pages]Enhanced quantum estimation via purificationReceived 25 April 2000; published 5 September 2000 We analyze the estimation of a finite ensemble of quantum bits that have been sent through a depolarizing channel. Instead of using the depolarized qubits directly, we first apply a purification step and show that this improves the fidelity of subsequent quantum estimation. Even though we lose some qubits of our finite ensemble the information is concentrated in the remaining purified ones. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.042301
DOI:
10.1103/PhysRevA.62.042301
PACS:
03.67.-a, 03.65.Bz
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