Memory effects in quantum channel discrimination
classification
🪐 quant-ph
keywords
channelsmemorydiscriminationprotocolsassistedoptimalquantumchannel
read the original abstract
We consider quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance for channels with memory. For optimal discrimination and estimation of sets of unitary channels memory-assisted protocols are not required.
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