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

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.

References in corpus (3)

• Assessing non-Markovian dynamics
• Experimental observation of weak non-Markovianity
• Spin chains and channels with memory

Cited by in corpus (7)

• Thermodynamic fingerprints of non-Markovianity in a system of coupled superconducting qubits
• Continuous-time quantum walk on spatially correlated noisy lattices
• Bose-Hubbard lattice as a controllable environment for open quantum systems
• Overcoming noise in quantum teleportation with multipartite hybrid entanglement
• Experimental Snapshot Verification of non-Markovianity with Unknown System-Probe Coupling
• Experimental Quantum Probing Measurements With No Knowledge on the System-Probe Interaction
• Exploring the Non-Markovian Dynamics in Depolarizing Maps