Improving the maximum transmission distance of four-state continuous-variable quantum key distribution by using a noiseless linear amplifier
Abstract
A modified four-state CVQKD protocol is proposed to increase the maximum transmission distance and tolerable excess noise in the presence of Gaussian lossy and noisy channel by using a noiseless linear amplifier (NLA). An ideal NLA with gain g can increase the maximum admission losses by 20log10g dB. Further, the imperfections in a practical NLA, such as the finite detection efficiency and imperfect single-photon source, are included in consideration.
- Publication:
-
Physical Review A
- Pub Date:
- June 2013
- DOI:
- 10.1103/PhysRevA.87.062311
- arXiv:
- arXiv:1210.0107
- Bibcode:
- 2013PhRvA..87f2311X
- Keywords:
-
- 03.67.Dd;
- 03.67.Hk;
- Quantum cryptography;
- Quantum communication;
- Quantum Physics
- E-Print:
- 6 pages, 5 figures