Asymptotic performance of optimal state estimation in quantum two level system

2004/11/10 by Masahito Hayashi, Hayashi, Masahito, Keiji Matsumoto +1 · 1 citation
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.quant-ph/0411073

openalex publication_date 2004/11/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We derived an asymptotic bound the accuracy of the estimation when we use the quantum correlation in the measuring apparatus. It is also proved that this bound can be achieved in any model in the quantum two-level system. Moreover, we show that this bound of such a model cannot be attained by any quantum measurement with no quantum correlation in the measuring apparatus. That is, in such a model, the quantum correlation can improve the accuracy of the estimation in an asymptotic setting.

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• Topics in Estimation of Quantum Channels

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