論文

査読有り
2015年3月

Unbounded number of channel uses may be required to detect quantum capacity

NATURE COMMUNICATIONS
  • Toby Cubitt
  • ,
  • David Elkouss
  • ,
  • William Matthews
  • ,
  • Maris Ozols
  • ,
  • David Perez-Garcia
  • ,
  • Sergii Strelchuk

6
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/ncomms7739
出版者・発行元
NATURE PUBLISHING GROUP

Transmitting data reliably over noisy communication channels is one of the most important applications of information theory, and is well understood for channels modelled by classical physics. However, when quantum effects are involved, we do not know how to compute channel capacities. This is because the formula for the quantum capacity involves maximizing the coherent information over an unbounded number of channel uses. In fact, entanglement across channel uses can even increase the coherent information from zero to non-zero. Here we study the number of channel uses necessary to detect positive coherent information. In all previous known examples, two channel uses already sufficed. It might be that only a finite number of channel uses is always sufficient. We show that this is not the case: for any number of uses, there are channels for which the coherent information is zero, but which nonetheless have capacity.

リンク情報
DOI
https://doi.org/10.1038/ncomms7739
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000353045600001&DestApp=WOS_CPL
URL
http://orcid.org/0000-0003-2023-2768
ID情報
  • DOI : 10.1038/ncomms7739
  • ISSN : 2041-1723
  • ORCIDのPut Code : 21092807
  • Web of Science ID : WOS:000353045600001
  • ORCIDで取得されたその他外部ID : a:1:{i:0;a:1:{s:8:"other-id";s:19:"WOS:000353045600001";}}

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