Selfcomplementary quantum channels

Abstract

Selfcomplementary quantum channels are characterized by such an interaction between the principal quantum system and the environment that leads to the same output states of both interacting systems. These maps can describe approximate quantum copy machines, as perfect copying of an unknown quantum state is not possible due to the celebrated no-cloning theorem. We provide here a parametrization of a large class of selfcomplementary channels and analyze their properties. Selfcomplementary channels preserve some residual coherences and residual entanglement. Investigating some measures of non-Markovianity we show that time evolution under selfcomplementary channels is highly non-Markovian.

23 pages, 4 figures

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• Relating compatibility and divisibility of quantum channels
• Energy-constrained LOCC-assisted quantum capacity of bosonic dephasing channel
• Trade--off relations for operation entropy of complementary quantum channels
• Degradable Strongly Entanglement Breaking Maps
• Exact Quantum Capacity of Decohering Channels in Arbitrary Dimensions