Optimal partial estimation of quantum states from several copies
Ladislav Mista, Jaromir Fiurasek
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.
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