Secret key capacity of the thermal-loss channel: Improving the lower bound

被引：13
|
作者：
Ottaviani, Carlo [1 ]
Laurenza, Riccardo
Cope, Thomas P. W.
Spedalieri, Gaetana
Braunstein, Samuel L.
Pirandola, Stefano
机构：
[1] Univ York, Comp Sci, York YO10 5GH, N Yorkshire, England
来源：
QUANTUM INFORMATION SCIENCE AND TECHNOLOGY II | 2016年 / 9996卷
关键词：
Quantum cryptography; secret key capacity; Gaussian channels; teleportation; VARIABLE QUANTUM CRYPTOGRAPHY; SQUASHED ENTANGLEMENT; TELEPORTATION;
D O I：
10.1117/12.2244899
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We consider the secret key capacity of the thermal loss channel, which is modeled by a beam splitter mixing an input signal mode with an environmental thermal mode. This capacity is the maximum value of secret bits that two remote parties can generate by means of the most general adaptive protocols assisted by unlimited and two-way classical communication. To date, only upper and lower bounds are known. The present work improves the lower bound by resorting to Gaussian protocols based on suitable trusted-noise detectors.
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页数：10
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