The optimal positive operator-valued measure for state discrimination

• URL: http://arxiv.org/abs/2108.10474v2
• Date: Fri, 24 Sep 2021 03:06:45 GMT
• Title: The optimal positive operator-valued measure for state discrimination
• Authors: Wei Li and Shengmei Zhao
• Abstract summary: We provide a theoretical study of the positive operator-valued measure (POVM) for discriminating nonorthogonal states. With simulation, we find that the optimal POVM measurement provides a tight upper bound for state discrimination. The derivation of optimal POVM measurement will play an important role in the security research of quantum key distribution.
• Score: 2.9848983009488936
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Evaluating the amount of information obtained from non-orthogonal quantum states is an important topic in the field of quantum information. The commonly used evaluation method is Holevo bound, which only provides a loose upper bound for quantum measurement. In this paper, we provide a theoretical study of the positive operator-valued measure (POVM) for discriminating nonorthogonal states. We construct a generalized POVM measurement operation, and derive the optimal one for state discrimination by Lagrange multiplier method. With simulation, we find that the optimal POVM measurement provides a tight upper bound for state discrimination, which is significantly lower than that predicted by Holevo bound. The derivation of optimal POVM measurement will play an important role in the security research of quantum key distribution.

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