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Hybrid modulation continuous variable QKD system and method based on compressed state

A technology of mixed modulation and compressed state, which is applied in the field of mixed modulation continuous variable QKD system, can solve the problems of difficult and limited preparation of compressed state, and achieve the effects of low noise, high protocol efficiency and high channel capacity

Active Publication Date: 2021-04-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Claims
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Problems solved by technology

However, due to the limited level of early technology, the preparation of the compressed state is extremely difficult, leading to the abandonment of the continuous variable QKD scheme using the compressed state

Method used

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  • Hybrid modulation continuous variable QKD system and method based on compressed state
  • Hybrid modulation continuous variable QKD system and method based on compressed state
  • Hybrid modulation continuous variable QKD system and method based on compressed state

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Embodiment Construction

[0074] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0075] Such as Figure 4 As shown, the present invention provides a mixed modulation continuous variable QKD system based on compressed states, including the sender Alice and the receiver Bob.

[0076] The sender Alice and the receiver Bob are connected through a quantum channel and a classical channel.

[0077] Wherein: the quantum channel is used to transmit signal light and synchronous light, and the classical channel is used to transmit classical light, and perform operations such as basis vector comparison and post-processing.

[0078] The sender Alice generates the key sequence, prepares and sends the quantum state, and performs base vector comparison and post-processing with the receiver Bob.

[0079] The receiving party Bob measures and records the sent quantum state, and performs base vector comparison and post-processing with the...

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Abstract

The invention provides a hybrid modulation continuous variable QKD system based on a compressed state. The hybrid modulation continuous variable QKD system comprises a sender and a receiver. The sender and the receiver are connected through a quantum channel and a classic channel; wherein the quantum channel is used for transmitting signal light and synchronous light, and the classic channel is used for transmitting classic light and carrying out basis vector comparison and post-processing; the sender generates a key sequence, prepares and sends a quantum state, and performs base vector comparison and post-processing with the receiver; and the receiver measures the received quantum state and records data, and performs base vector comparison and post-processing with the sender. According to the system, a compressed state is adopted as a light source quantum state, Gaussian modulation is carried out on a compressed component, and discrete modulation is carried out on a stretched component; characteristics and advantages of a compressed state are fully combined, and compared with a previous single modulation scheme adopting coherent light, the scheme is smaller in noise, lower in bit error rate, higher in protocol efficiency, farther in transmission distance and higher in channel capacity.

Description

technical field [0001] The invention relates to the field of quantum information and quantum encryption communication, in particular to a mixed modulation continuous variable QKD system and method based on compressed states. Background technique [0002] Quantum key distribution (quantum key distribution, QKD) technology provides a practical way for remote communication parties to securely distribute key information. Among them, continuous variable QKD has attracted extensive attention because of its high detection efficiency and strong anti-interference ability, and has become a research hotspot in the field of quantum encryption communication in recent years. [0003] The current continuous variable QKD has two modulation methods, one is Gaussian modulation and the other is discrete modulation. Among them, the Gaussian modulation has the advantage that the distribution of the orthogonal component of the light field is a Gaussian distribution, which can achieve a higher ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
Inventor 郭邦红刘刚胡敏
Owner SOUTH CHINA NORMAL UNIVERSITY
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