One-dimensional modulation continuous variable quantum key distribution system based on heterodyne detection, and implementation method thereof

A technology of quantum key distribution and heterodyne detection, applied in key distribution to simplify the system structure and reduce production costs

Inactive Publication Date: 2018-01-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The one-dimensional scheme simplifies the modulation method of the signal light while ensuring the safety of the system. The one-dimensional Gaussian modulation of the signal light can be realized through a phase modulator. Ho

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  • One-dimensional modulation continuous variable quantum key distribution system based on heterodyne detection, and implementation method thereof
  • One-dimensional modulation continuous variable quantum key distribution system based on heterodyne detection, and implementation method thereof

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the examples are only used to illustrate the present invention, but not to limit the protection scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope of protection defined in the present application.

[0040] The present invention is based on the one-dimensional modulation continuous variable quantum key distribution system of heterodyne detection, such as figure 1 As shown, including the sending end and the receiving end, the sending end includes:

[0041] A pulsed laser for generating a pulsed laser with a frequency of 10MH;

[0042] The first beam splitter is used to divide the pulse lase...

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Abstract

The invention discloses a one-dimensional modulation continuous variable quantum key distribution system based on heterodyne detection, and an implementation method thereof. Pulse laser is divided bya first beam splitter into signal light and local oscillator light at a sending end, an electro-optic phase modulator modulates the signal light, and the modulated signal light is attenuated to a quantum level by an adjustable light attenuator; the signal light at the quantum level is merged with the local oscillator light by a polarization coupler and is transmitted to a receiving end by a quantum channel; signal detection is performed on the receiving end by the heterodyne detection technology, the output information of a first differential amplifier and a second differential amplifier are sent to a data collection card and a computer system for collection and analysis processing, and a group of safe quantum keys is obtained on the sending end and the receiving end separately. Accordingto the one-dimensional modulation continuous variable quantum key distribution system, the modulation process in the continuous variable quantum key distribution system can be achieved just by one electro-optic phase modulator, thereby effectively simplifying the system structure, reducing the volume of the device, reducing the data processing volume and reducing the manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of optical fiber quantum communication, and relates to a one-dimensional modulation continuous variable quantum key distribution system based on heterodyne detection and an implementation method thereof. Background technique [0002] Quantum key distribution enables legitimate communication parties to safely share keys in an untrusted quantum channel, and its security features are based on the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, quantum key distribution is divided into two directions: discrete variable and continuous variable according to the difference of information carrier. Compared with the discrete variable quantum key distribution protocol, the quantum state of the continuous variable quantum key distribution is easier to prepare, can be integrated into the existing optical fiber system, and can use high-efficiency and low-cost homodyne detection ...

Claims

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Application Information

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IPC IPC(8): H04L9/08
Inventor 郭迎谢才浪黄端廖骎
Owner CENT SOUTH UNIV
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