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General quantum measurements optimally interpolate between measurement paradigms
July 18, 2022
The ability to distinguish between two different quantum states can enable optical communication, cryptography, and networking. However, any overlap between the two states fundamentally limits how well they can be identified, and bounds how well various discrimination tasks can be achieved. Measurements for state discrimination include measurements that can identify the two states with the minimum possible error and measurements that can unambiguously discriminate the two states by introducing inconclusive results. However, quantum mechanics allows for more general quantum measurements encompassing these and other discrimination paradigms, which can be a powerful tool for quantum information and communications.