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Phys-ical Sciences and Engineering CC-BY 12th Conference on the Theory of Quantum Computation, Communication, and Cryptography
We introduce a definition of the fidelity function for multi-round quantum strategies, which we call the strategy fidelity, that is a generalization of the fidelity function for quantum states. We provide many interesting properties of the strategy fidelity including a Fuchs-van de Graaf relationship with the strategy norm. We illustrate an operational interpretation of the strategy fidelity in the spirit of Uhlmann's Theorem and discuss its application to the security analysis of quantumfatcat:q3w27szbizb4ncdtlhorjjxbme