Continuous-variable quantum key distribution system: Past, present, and future

doi:10.1063/5.0179566

Continuous-variable quantum key distribution system: Past, present, and future

2024-03-27

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DOI：10.1063/5.0179566

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Quantum key distribution provides secure keys with information-theoretic security ensured by the principle of quantum mechanics. The continuous-variable version of quantum key distribution using coherent states offers the advantages of its compatibility with telecom industry, e.g., using commercial laser and homodyne detector, is now going through a booming period. In this review article, we describe the principle of continuous-variable quantum key distribution system; focus on protocols based on coherent states, whose systems are gradually moving from proof-of-principle lab demonstrations to in-field implementations and technological prototypes. We start by reviewing the theoretical protocols and the current security status of these protocols. Then, we discuss the system structure, the key module, and the mainstream system implementations. The advanced progresses for future applications are discussed, including the digital techniques, system on chip, and point-to-multipoint system. Finally, we discuss the practical security of the system and conclude with promising perspectives in this research field.

Keywords:

RANDOM NUMBER GENERATION

BALANCED HOMODYNE DETECTOR

FIELD-TEST

FRAME SYNCHRONIZATION

PHASE COMPENSATION

SILICON PHOTONICS

LOCAL OSCILLATOR

SECURE

NOISE

STATE

Continuous-variable quantum key distribution system: Past, present, and future

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