Optimal universal programmable detectors for unambiguous discrimination

Abstract

We discuss the problem of designing unambiguous programmable discriminators for any n unknown quantum states in an m-dimensional Hilbert space. The discriminator is a fixed measurement that has two kinds of input registers: the program registers and the data register. The quantum state in the data register is what users want to identify, which is confirmed to be among the n states in program registers. The task of the discriminator is to tell the users which state stored in the program registers is equivalent to that in the data register. First, we give a necessary and sufficient condition for judging an unambiguous programmable discriminator. Then, if $m=n$, we present an optimal unambiguous programmable discriminator for them, in the sense of maximizing the worst-case probability of success. Finally, we propose a universal unambiguous programmable discriminator for arbitrary n quantum states.

7 pages

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• Success probabilities for universal unambiguous discriminators between unknown pure states
• An agnostic-Dolinar receiver for coherent states classification
• Optimal quantum state identification with qudit-encoded unknown states
• Optimal programmable unambiguous discriminator between two unknown latitudinal states
• Quantum Advantage in Storage and Retrieval of Isometry Channels
• Quantum theory of unambiguous measurements
• Dealing with ignorance: universal discrimination, learning and quantum correlations