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arXiv:1207.5612 · Quantum Information Processing

Quantum capacity of an amplitude-damping channel with memory

Rabia Jahangir, Nigum Arshed, A. H. Toor

Published Nov 28, 2014• 13 citations
arXivHTMLPDF
DOI
10.1007/s11128-014-0883-y

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We study the performance of a partially correlated amplitude damping channel acting on two qubits. We derive lower bounds for the single-shot classical capacity by studying two kinds of quantum ensembles, one which allows us to maximize the Holevo quantity for the memoryless channel and the other allowing the same task but for the full-memory channel. In these two cases we also show the amount of entanglement which is involved in achieving the maximum of the Holevo quantity. For the single-shot quantum capacity we discuss both a lower and an upper bound, achieving a good estimate for high values of the channel transmissivity. We finally compute the entanglement-assisted classical channel capacity.