Information-Disturbance Tradeoff in Quantum State Discrimination

Details Information-Disturbance Tradeoff in Quantum State Discrimination Information-Disturbance Tradeoff in Quantum State Discrimination

2006-10-23

arxiv.org/abs/quant-ph/0610196v2

Phys. Rev. A 74, 052320 (2006)

Physics

Quantum Physics

5 pages, 2 (low-quality) figures. Eq. (20) corrected. Final published version

Scientific paper

10.1103/PhysRevA.74.052320

When discriminating between two pure quantum states, there exists a quantitative tradeoff between the information retrieved by the measurement and the disturbance caused on the unknown state. We derive the optimal tradeoff and provide the corresponding quantum measurement. Such an optimal measurement smoothly interpolates between the two limiting cases of maximal information extraction and no measurement at all.

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