Performance Improvement of Two-way Quantum Key Distribution by Using a Heralded Noiseless Amplifier

We show the successful use of a heralded noiseless linear amplifier on the detection stage in the two-way continuous-variable quantum key distribution to improve the performance. Due to the excess noise, the secret-key rate of the two-way protocol becomes negative for a certain distance of transmiss...

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Veröffentlicht in:	International journal of theoretical physics 2016-04, Vol.55 (4), p.2199-2211
Hauptverfasser:	Li, Chenyang, Miao, Ruihang, Gong, Xinbao, Guo, Ying, He, Guangqiang
Format:	Artikel
Sprache:	eng
Schlagworte:	Elementary Particles Mathematical and Computational Physics Physics Physics and Astronomy Quantum Field Theory Quantum Physics Theoretical
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Zusammenfassung:	We show the successful use of a heralded noiseless linear amplifier on the detection stage in the two-way continuous-variable quantum key distribution to improve the performance. Due to the excess noise, the secret-key rate of the two-way protocol becomes negative for a certain distance of transmission. The use of a heralded noiseless linear amplifier increases this distance by the equivalent of 20 log 10 g dB of losses, and it also helps the two-way protocol tolerate more excess noise.
ISSN:	0020-7748 1572-9575
DOI:	10.1007/s10773-015-2859-9