Optimal probabilistic estimation of quantum states

Details Optimal probabilistic estimation of quantum states Optimal probabilistic estimation of quantum states

2006-06-19

arxiv.org/abs/quant-ph/0606156v1

New J. Phys. 8, 192 (2006).

Physics

Quantum Physics

7 pages, 2 figures, ReVTeX4

Scientific paper

10.1088/1367-2630/8/9/192

We extend the concept of probabilistic unambiguous discrimination of quantum states to quantum state estimation. We consider a scenario where the measurement device can output either an estimate of the unknown input state or an inconclusive result. We present a general method how to evaluate the maximum fidelity achievable by the probabilistic estimation strategy. We illustrate our method on two explicit examples: estimation of a qudit from a pair of conjugate qudits and phase covariant estimation of a qubit from N copies. We show that by allowing for inconclusive results it is possible to reach estimation fidelity higher than that achievable by the best deterministic estimation strategy.

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