par Niset, Julien ;Fiurasek, Jaromir ;Cerf, Nicolas
Référence Physical Review Letters, 102, page (120501)
Publication Publié, 2009
Article révisé par les pairs
Résumé : We prove that Gaussian operations are of no use for protecting Gaussian states against Gaussian errors in quantum communication protocols. Specifically, we introduce a new quantity characterizing any single-mode Gaussian channel, called entanglement degradation, and show that it cannot decrease via Gaussian encoding and decoding operations only. The strength of this no-go theorem is illustrated with some examples of Gaussian channels.

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