"Pretty strong" converse for the quantum capacity of degradable channels

We exhibit a possible road towards a strong converse for the quantum capacity of degradable channels. In particular, we show that all degradable channels obey what we call a "pretty strong" converse: When the code rate increases above the quantum capacity, the fidelity makes a discontinuou...

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Veröffentlicht in:	arXiv.org 2013-10
Hauptverfasser:	Morgan, Ciara, Winter, Andreas
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymptotic properties Channels Computer Science - Information Theory Degradation Mathematics - Information Theory Physics - Quantum Physics
Online-Zugang:	Volltext
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