A low-complexity heterodyne CV-QKD architecture

In contrast to the more prominent discrete-variable quantum key distribution (DV-QKD), which requires specialized hardware like single-photon detectors, the continuous-variable version (CV-QKD) promises low-cost and high-performance implementations by leveraging mature telecommunication technology. In this paper we demonstrate a simplified CV-QKD architecture based on analog frontends and digitizers for mobile communication systems and standard optical components. The high-fidelity, software-defined receiver and transmitter allow us to shift complexity from the analog to the digital domain, thus simplifying the system, improving robustness and paving the way for a low-cost implementation.

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

[2]  Kazuro Kikuchi,et al.  Fundamentals of Coherent Optical Fiber Communications , 2016, Journal of Lightwave Technology.

[3]  Frédéric Grosshans,et al.  Continuous-variable quantum cryptography is secure against non-Gaussian attacks. , 2004, Physical review letters.

[4]  Hao Qin,et al.  Coexistence of continuous variable QKD with intense DWDM classical channels , 2014, 1412.1403.

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

[6]  Philip Walther,et al.  Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations , 2017, Advanced Quantum Technologies.

[7]  Eleni Diamanti,et al.  Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations , 2015, Entropy.

[8]  Bing Qi,et al.  Generating the local oscillator "locally" in continuous-variable quantum key distribution based on coherent detection , 2015, 1503.00662.

[9]  Patrick J. Coles,et al.  Self-referenced continuous-variable quantum key distribution protocol , 2015, 1503.04763.

[10]  P. Grangier,et al.  Continuous-variable quantum-key-distribution protocols with a non-Gaussian modulation , 2011, Physical Review A.

[11]  Bing Qi,et al.  Practical challenges in quantum key distribution , 2016, npj Quantum Information.

[12]  Peng Huang,et al.  High-speed continuous-variable quantum key distribution without sending a local oscillator. , 2015, Optics letters.

[13]  Sébastien Kunz-Jacques,et al.  Long Distance Continuous-Variable Quantum Key Distribution with a Gaussian Modulation , 2011, Physical Review A.

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