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Implementation of continuous-variable quantum key distribution with discrete modulation
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DOI：10.1088/2058-9565/aa7230.png)
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We have developed a continuous-variable quantum key distribution (CV-QKD) system that employs discrete quadrature-amplitude modulation and homodyne detection of coherent states of light. We experimentally demonstrated automated secure key generation with a rate of 50 kbps when a quantum channel is a 10 kmoptical fibre. The CV-QKD system utilises a four-state and post-selection protocol and generates a secure key against the entangling cloner attack. We used a pulsed light source of 1550 nm wavelength with a repetition rate of 10 MHz. A commercially available balanced receiver is used to realise shot-noise-limited pulsed homodyne detection. We used a non-binary LDPC code for error correction (reverse reconciliation) and the Toeplitz matrix multiplication for privacy amplification. A graphical processing unit card is used to accelerate the software-based post-processing.
Keyword:
continuous-variable quantum key distribution
quadrature amplitude modulation
pulsed homodyne detection
期刊
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5
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1.4K
被引数:
5.1K
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25 MHz clock continuous-variable quantum key distribution system over 50 km fiber channel.png)
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