Fundamental rate-loss tradeoff for optical quantum key distribution

Since 1984, various optical quantum key distribution (QKD) protocols have been proposed and examined. In all of them, the rate of secret key generation decays exponentially with distance. A natural and fundamental question is then whether there are yet-to-be discovered optical QKD protocols (without...

Full description

Bibliographic Details
Published in:Nature communications, Vol. 5 (2014), p. 5235
Main Author: Takeoka, Masahiro (Author)
Other Involved Persons: Guha, Saikat ; Wilde, Mark M
Format: electronic Article
Language:English
ISSN:2041-1723
Item Description:Date Completed 06.04.2015
Date Revised 24.10.2014
published: Electronic
Citation Status PubMed-not-MEDLINE
Copyright: From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Physical Description:Online-Ressource
DOI:10.1038/ncomms6235
Subjects:
QR Code: Show QR Code
LEADER 02486nma a2200421 c 4500
001 NLM242963331
003 DE-601
005 20181229011053.0
007 cr uuu---uuuuu
008 180206s2014 000 0 eng d
024 7 |a 10.1038/ncomms6235  |2 doi 
028 5 2 |a pubmed19n0810.xml 
035 |a (DE-599)NLM25341406 
040 |b ger  |c GBVCP 
041 0 |a eng 
100 1 |a Takeoka, Masahiro  |e verfasserin  |4 aut 
245 1 0 |a Fundamental rate-loss tradeoff for optical quantum key distribution  |h Elektronische Ressource 
300 |a Online-Ressource 
500 |a Date Completed 06.04.2015 
500 |a Date Revised 24.10.2014 
500 |a published: Electronic 
500 |a Citation Status PubMed-not-MEDLINE 
500 |a Copyright: From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine 
520 |a Since 1984, various optical quantum key distribution (QKD) protocols have been proposed and examined. In all of them, the rate of secret key generation decays exponentially with distance. A natural and fundamental question is then whether there are yet-to-be discovered optical QKD protocols (without quantum repeaters) that could circumvent this rate-distance tradeoff. This paper provides a major step towards answering this question. Here we show that the secret key agreement capacity of a lossy and noisy optical channel assisted by unlimited two-way public classical communication is limited by an upper bound that is solely a function of the channel loss, regardless of how much optical power the protocol may use. Our result has major implications for understanding the secret key agreement capacity of optical channels-a long-standing open problem in optical quantum information theory-and strongly suggests a real need for quantum repeaters to perform QKD at high rates over long distances 
611 2 7 |a Journal Article  |2 gnd 
611 2 7 |a Research Support, Non-U.S. Gov't  |2 gnd 
611 2 7 |a Research Support, U.S. Gov't, Non-P.H.S.  |2 gnd 
689 0 0 |A f  |a Journal Article 
689 0 1 |A f  |a Research Support, Non-U.S. Gov't 
689 0 2 |A f  |a Research Support, U.S. Gov't, Non-P.H.S. 
689 0 |5 DE-601 
700 1 |a Guha, Saikat  |e verfasserin  |4 aut 
700 1 |a Wilde, Mark M  |e verfasserin  |4 aut 
773 0 8 |i in  |t Nature communications  |g Vol. 5 (2014), p. 5235  |q 5<5235  |w (DE-601)NLM199281564  |x 2041-1723 
856 4 1 |u http://dx.doi.org/10.1038/ncomms6235  |3 Volltext 
912 |a GBV_NLM 
951 |a AR 
952 |d 5  |j 2014  |c 10  |h 5235