A novel experimental preparation of Gaussian modulated coherent state based on dual-drive Mach-Zehnder modulator in continuous variable quantum key distribution

In this paper, a novel experimental preparation scheme of Gaussian modulated coherent state (GMCS) in continuous variable quantum key distribution (CVQKD) system is proposed based on dual-drive Mach-Zehnder modulator (DDMZM). The experimental implementation of the proposed GMCS preparation scheme only depends on a DDMZM instead of an AM and a PM in conventional CVQKD, which simplifies the experimental setup and reduces the costs of the CVQKD system. Moreover, the sum-difference signals of the Rayleigh distribution and uniform distribution are applied on two parallel electrodes of the DDMZM, respectively, getting rid of the accurate time-delay alignment between the AM and the PM in conventional Gaussian modulation scheme. Besides, the measurement method of the prepared GMCS is experimentally demonstrated based on heterodyne detection, and both quadrature (X and P) are simultaneously measured to verify the proposed GMCS preparation scheme.

[1]  Roberto Corvaja.  Phase-noise limitations in continuous-variable quantum key distribution with homodyne detection , 2017 .

[2]  T. Ralph,et al.  Continuous variable quantum cryptography , 1999, quant-ph/9907073.

[3]  S. McLaughlin,et al.  Quantum key distribution over 25 km with an all-fiber continuous-variable system , 2007, 0706.4255.

[4]  Sebastian Kleis,et al.  Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals. , 2017, Optics letters.

[5]  Eleni Diamanti,et al.  Experimental demonstration of long-distance continuous-variable quantum key distribution , 2012, Nature Photonics.

[6]  Anthony Leverrier,et al.  Composable security proof for continuous-variable quantum key distribution with coherent States. , 2014, Physical review letters.

[7]  Wee Ser,et al.  An integrated silicon photonic chip platform for continuous-variable quantum key distribution , 2019, Nature Photonics.

[8]  P. Grangier,et al.  Continuous variable quantum cryptography using coherent states. , 2001, Physical review letters.

[9]  Peng Huang,et al.  Continuous-variable quantum key distribution with 1 Mbps secure key rate. , 2015, Optics express.

[10]  Miguel Navascués,et al.  Optimality of Gaussian attacks in continuous-variable quantum cryptography. , 2006, Physical review letters.

[11]  N. Cerf,et al.  Quantum key distribution using gaussian-modulated coherent states , 2003, Nature.

[12]  Yong Liu,et al.  Calibration-free and bias-drift-free microwave characterization of dual-drive Mach–Zehnder modulators using heterodyne mixing , 2015 .

[13]  M. Curty,et al.  Secure quantum key distribution , 2014, Nature Photonics.

[14]  Hong Guo,et al.  Long-distance continuous-variable quantum key distribution over 202.81 km fiber , 2020, 2001.02555.

[15]  Guihua Zeng,et al.  Pilot-multiplexed continuous-variable quantum key distribution with a real local oscillator , 2018 .

[16]  Ming Li,et al.  Continuous-Variable Quantum Key Distribution With Self-Reference Detection and Discrete Modulation , 2018, IEEE Journal of Quantum Electronics.

[17]  Maxim Kuschnerov,et al.  A flexible continuous-variable QKD system using off-the-shelf components , 2017, Security + Defence.

[18]  H. Lo,et al.  Experimental study on the Gaussian-modulated coherent-state quantum key distribution over standard telecommunication fibers , 2007, 0709.3666.

[19]  Peng Huang,et al.  25 MHz clock continuous-variable quantum key distribution system over 50 km fiber channel , 2015, Scientific Reports.

[20]  Renato Renner,et al.  Security of continuous-variable quantum key distribution against general attacks. , 2012, Physical review letters.

[21]  T Franz,et al.  Continuous variable quantum key distribution: finite-key analysis of composable security against coherent attacks. , 2011, Physical review letters.

[22]  Romain All'eaume,et al.  Self-coherent phase reference sharing for continuous-variable quantum key distribution , 2016, 1605.03642.