Optimal partial estimation of quantum states from several copies

Details Optimal partial estimation of quantum states from several copies Optimal partial estimation of quantum states from several copies

2006-06-13

arxiv.org/abs/quant-ph/0606112v1

Phys. Rev. A 74, 022316 (2006).

Physics

Quantum Physics

5 pages, 2 figures, RevTeX4

Scientific paper

10.1103/PhysRevA.74.022316

We derive analytical formula for the optimal trade-off between the mean
estimation fidelity and the mean fidelity of the qubit state after a partial
measurement on N identically prepared qubits. We also conjecture analytical
expression for the optimal fidelity trade-off in case of a partial measurement
on N identical copies of a d-level system.

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