Optimality of minimum-error discrimination by the no-signalling condition
classification
🪐 quant-ph
keywords
conditionno-signallingdiscriminationquantumstatescannotderivediscriminated
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In this work we relate the well-known no-go theorem that two non-orthogonal (mixed) quantum states cannot be perfectly discriminated, to the general principle in physics, the no-signalling condition. In fact, we derive the minimum error in discrimination between two quantum states, using the no-signalling condition.
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