Experimental study on discretely modulated continuous-variable quantum key distribution

Abstract

We present a discretely modulated continuous-variable quantum key distribution system in free space by using strong coherent states. The amplitude noise in the laser source is suppressed to the shot-noise limit by using a mode cleaner combined with a frequency shift technique. Also, it is proven that the phase noise in the source has no impact on the final secret key rate. In order to increase the encoding rate, we use broadband homodyne detectors and the no-switching protocol. In a realistic model, we establish a secret key rate of 46.8 kbits/s against collective attacks at an encoding rate of 10 MHz for a 90% channel loss when the modulation variance is optimal.

arXiv comment7 pages,6 figures

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• Experimental Demonstration of Sequential Multiparty Quantum Secret Sharing and Quantum Conference Key Agreement
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• Enhancement of the security of a practical continuous-variable quantum-key-distribution system by manipulating the intensity of the local oscillator
• Zero-photon catalysis based eight-state discrete modulated measurement-device-independent continuous-variable quantum key distribution
• Single-photon-detection attack on the phase-coding continuous-variable quantum cryptography