Optimal partial estimation of quantum states from several copies

Abstract

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.

5 pages, 2 figures, RevTeX4

References in corpus (1)

• Information-disturbance tradeoff in estimating a maximally entangled state

Cited by in corpus (3)

• Information-Disturbance Tradeoff in Quantum State Discrimination
• Information-disturbance tradeoff for spin coherent state estimation
• Optimal multicopy asymmetric Gaussian cloning of coherent states