A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum Key Distribution
HUANG Duan, FANG Jian, WANG Chao, HUANG Peng** , ZENG Gui-Hua**
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiaotong University, Shanghai 200240
Abstract ：In Gaussian-modulated coherent-state quantum key distribution, the measurement of quadratures of coherent states is performed by using a homodyne detector. However, conventional detectors usually suffer from narrow bands. We present a method to design a high-speed shot-noise-limited balanced homodyne detector. A 300-MHz bandwidth detector is experimentally tested and the level of shot noise is 14 dB higher than the electronic noise. The results show that a detector with this method is potential to design a GHz bandwidth detector for continuous variable quantum key distribution at a low level of ratio of shot noise to electronic noise.
收稿日期: 2013-07-02
出版日期: 2013-11-30
:
42.50.Dv
(Quantum state engineering and measurements)
03.67.Hk
(Quantum communication)
[1] Grosshans F and Grangier P 2002 Phys. Rev. Lett. 88 057902 Nat. Photon. 421 4382012 Rev. Mod. Phys. 84 621 2007 Phys. Rev. A 76 052323 2013 Nat. Photon. 7 378 2007 Phys. Rev. A 75 035802 2007 Appl. Phys. Lett. 90 041111 2012 Opt. Commun. 285 5259 2008 Opt. Lett. 33 001458 2011 New J. Phys. 13 013003 2003 Phys. Rev. A 68 042331 2001 Opt. Lett. 26 1430 2012 Chin. Phys. Lett. 29 124202 2007 Phys. Rev. A 75 052304 2006 Phys. Rev. Lett. 97 190503 2006 Phys. Rev. Lett. 97 190502 2013 J. Opt. Soc. Am. B 30 1303
[1]
.
[2]
.
[3]
.
[4]
.
[5]
.
[6]
.
[7]
.
[8]
.
[9]
.
[10]
.
[11]
.
[12]
.
[13]
.
[14]
.
[15]
.
2013, Vol. 30 
