document: Quantum-controlled measurement device for quantum-state discrimination We propose a `` programmable '' quantum device that is able to perform a specific generalized measurement from a certain set of measurements depending on a quantum state of a `` program register . '' In particular , we study a situation when the programmable measurement device serves for the unambiguous discrimination between nonorthogonal states . The particular pair of states that can be unambiguously discriminated is specified by the state of a program qubit . The probability of successful discrimination is not optimal for all admissible pairs . However , for some subsets it can be very close to the optimal value
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extractive_keyphrases: quantum state program register nonorthogonal states program qubit
abstractive_keyphrases: quantum-controlled measurement device quantum-state discrimination programmable quantum device