Optimal Quantum State Estimation with Use of the No-Signaling Principle

Details Optimal Quantum State Estimation with Use of the No-Signaling Principle Optimal Quantum State Estimation with Use of the No-Signaling Principle

2010-10-31

arxiv.org/abs/1011.0150v2

Physical Review A 82, 062318 (2010)

Physics

Quantum Physics

3 pages, 1 figure

Scientific paper

A simple derivation of the optimal state estimation of a quantum bit was obtained by using the no-signaling principle. In particular, the no-signaling principle determines a unique form of the guessing probability independently of figures of merit, such as the fidelity or information gain. This proves that the optimal estimation for a quantum bit can be achieved by the same measurement for almost all figures of merit.

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