Entanglement-annihilating and entanglement-breaking channels

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Authors

ZIMAN Mário MORAVČÍKOVÁ Lenka

Year of publication 2010
Type Article in Periodical
Magazine / Source Journal of Physics A: Mathematical and Theoretical
MU Faculty or unit

Faculty of Informatics

Citation
Web http://arxiv.org/abs/1006.2502
Field Informatics
Keywords Quantum entanglement; quantum channels
Description We introduce and investigate a family of entanglement-annihilating channels. These channels are capable of destroying any quantum entanglement within the system they act on. We show that they are not necessarily entanglement breaking. In order to achieve this result we analyze the subset of locally entanglement-annihilating channels. In this case, the same local noise applied on each subsystem individually is less entanglement annihilating (with respect to multi-partite entanglement) as the number of subsystems is increasing. Therefore, the bipartite case provides restrictions on the set of local entanglement-annihilating channels for the multipartite case. The introduced concepts are illustrated on the family of single-qubit depolarizing channels.
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