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High-speed quantum key distribution method

A quantum key distribution, high-speed technology, applied in the field of quantum communication, can solve the problem of low key generation rate of quantum key distribution system, and achieve the effect of simplifying hardware structure design, improving evaluation accuracy, and improving optical coupling efficiency

Active Publication Date: 2017-12-08
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0005] Researchers at home and abroad have increased the operating frequency of the quantum key distribution system to 1.25 GHz, and used superconducting single-photon detectors with high sensitivity and low noise, but the key generation rate of the quantum key distribution system is still low

Method used

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0036] like figure 1 Shown is a schematic structural diagram of the high-speed quantum key distribution device of the present invention. It can be seen from the figure that the high-speed quantum key distribution device of the present invention includes a transmitting end and a receiving end, wherein the transmitting end includes a light source 1, an entanglement source 3, and a first single-photon detector 4 , the second single photon detector 7, the third single photon detector 16, the first optical beam splitter 5, the second optical beam splitter 6, the third optical beam splitter 15, the retarder 8 and the homodyne detector 17 . The receiving end includes a modulator 2 , a fourth optical beam splitter 9 , a fourth single photon detector 10 , a random number generator 12 and an optical amplifier 13 .

[0037] The channel from the transmitt...

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Abstract

The present invention relates to a high-speed quantum key distribution method. The method includes the following steps that: after the first photon of an entangled photon pair emitted by an entanglement source in a transmitting terminal is triggered, and the time label A of each signal is recorded, after the second photon and laser emitted by a light source are combined together, reflected light and transmitted light are obtained, part of light is detected from the reflected light is selected so as to be detected, the time label B of each signal is recorded, and the remaining part of the reflected light is outputted to a receiving end; delaying processing is performed on the transmitted light, so that delayed light can be obtained; the receiving end selects part of light from received light so as to detect the selected light, records the time label C of each signal, sequentially modulates and amplifies the remaining part of the received light, and outputs the modulated and amplified received light to the transmitting end; and the transmitting end selects part of light from received light so as to detect the light, records the time label D of each signal, and performs zero-difference detection on the remaining part of the received light and the delayed light. With the high-speed quantum key distribution method of the invention adopted, the accuracy of channel safety assessment and the optical efficiency of a transmitting system are significantly improved, and the security of a two-way communication link can be greatly improved.

Description

technical field [0001] The invention relates to a high-speed quantum key distribution method, which belongs to the technical field of quantum communication. Background technique [0002] Since the first quantum key distribution scheme was proposed in 1984, the quantum key distribution technology was basically in the theoretical research stage before 2000, and the experimental research work started from the entanglement test around 1997, and it began to be more systematic in 2003 Until 2005, the decoy state scheme overcomes the split photon number attack using the non-ideal (non-ideal single photon) characteristics of the light source, and the quantum key distribution technology began its practical development. With the continuous breakthrough of technology and technology, the performance, function, reliability and integration of equipment have gradually improved to a practical level. By around 2013, a large-scale multi-node metropolitan area network will be built, and the qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/70H04L9/08
Inventor 张安宁褚鑫贾鲁宁李洁杨然王鹏程王学锋
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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