Memory Effects in Spin Chain Channels for Information Transmission

Abstract

We investigate the multiple use of a ferromagnetic spin chain for quantum and classical communications without resetting. We find that the memory of the state transmitted during the first use makes the spin chain a qualitatively different quantum channel during the second transmission, for which we find the relevant Kraus operators. We propose a parameter to quantify the amount of memory in the channel and find that it influences the quality of the channel, as reflected through fidelity and entanglement transmissible during the second use. For certain evolution times, the memory allows the channel to exceed the memoryless classical capacity (achieved by separable inputs) and in some cases it can also enhance the quantum capacity.

5 pages, 4 figures

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• Classical capacity of a qubit depolarizing memory channel with Markovian correlated noise
• Measurement enhances long-distance Entanglement generation in spin chains with dissipative processes
• Witnessing latent time correlations with a single quantum particle
• Security of deterministic key distribution with higher-dimensional systems
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• Quantum Finite-Depth Memory Channels: Case Study