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Non-Markovian dynamics in two-qubit dephasing channels with an application to superdense coding




TekijätKarlsson A, Lyyra H, Laine EM, Maniscalco S, Piilo J

KustantajaAMER PHYSICAL SOC

Julkaisuvuosi2016

JournalPhysical Review A

Tietokannassa oleva lehden nimiPHYSICAL REVIEW A

Lehden akronyymiPHYS REV A

Artikkelin numeroARTN 032135

Vuosikerta93

Numero3

Sivujen määrä7

ISSN2469-9926

eISSN2469-9934

DOIhttps://doi.org/10.1103/PhysRevA.93.032135


Tiivistelmä

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 nonzero 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.


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