Abstract
In quantum information and quantum computing, the carrier of information is a quantum system and information is encoded in its state. Secure communication schemes employ non‐orthogonal states that can not be discriminated with 100% probability of success. We briefly review various possible optimized state discrimination strategies since they provide a quantitative figure of merit for the acceptable noise level in quantum communication. We also report on recent results in two special areas. First, we consider discrimination between mixed quantum states. Second, we show that communication via completely unknown quantum states is possible and discuss programmable quantum state discriminators that accomplish this task optimally.
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