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25 April 2024

» arxiv » 1509.5307

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Non-Markovian dynamics in two-qubit dephasing channels with an application to superdense coding
Antti Karlsson ; Henri Lyyra ; Elsi-Mari Laine ; Sabrina Maniscalco ; Jyrki Piilo ;
Date:	17 Sep 2015
Abstract:	We study the performance of two measures of non-Markovianity in detecting memory effects in two-qubit dephasing channels. By combining independent Markovian and non-Markovian noise on the qubits, our results show that the trace distance measure is able to detect the memory effects when at least one of the local channels displays non-Markovianity. A measure based on channel capacity, in turn, becomes non-zero when the global two-qubit dynamics shows memory effects. We apply these schemes to a well-known superdense coding protocol and demonstrate an optimal noise configuration to maximize the information transmission with independent local noises.
Source:	arXiv, 1509.5307
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