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Integrated chip-based high-dimensional quantum key distribution system

A key distribution system and high-dimensional quantum technology, applied in the field of high-dimensional quantum key distribution systems, can solve problems such as difficulty in large-scale deployment, large system size, and complicated debugging, and achieve high anti-noise capability and high system stability. improve the detection efficiency

Pending Publication Date: 2022-08-02
GUANGXI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the system is bulky, complicated to debug, poor in stability, and high in cost, making it difficult to achieve large-scale deployment

Method used

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  • Integrated chip-based high-dimensional quantum key distribution system

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Embodiment 1

[0048] figure 1 A structural diagram of the integrated chip high-dimensional quantum key distribution system provided by the first embodiment of the present invention is shown, as shown in figure 1 As shown, the integrated chip high-dimensional quantum key distribution system of the present invention includes a transmitting end 1, a receiving end 2, a transmitting and coding end chip 11, a first laser 12, a second laser 13, a receiving and decoding end chip 21, and a photoelectric detection end. 22, first single photon detector 23, second single photon detector 24, third single photon detector 25, fourth single photon detector 26, fifth single photon detector 27, sixth single photon detector 28 , the seventh single-photon detector 29 and the eighth single-photon detector 210;

[0049]Both the first laser 12 and the second laser 13 are connected to the transmitting and encoding end chip 11, the transmitting and encoding end chip 11 is connected to the receiving and decoding en...

Embodiment 2

[0071] Embodiment 2 Implementation of an integrated HD-QKD system based on time phase encoding

[0072] In step S1, the continuous light sent by the off-chip laser is coupled into the waveguide through the first fiber coupler 1101, and then enters the transmitting and encoding end chip 11. By adjusting the first thermally tunable phase shifter 110303, the first optical power detector 110307 outputs light. The intensity is the largest, the output light intensity of the second optical power detector 110314 is maximized by adjusting the third thermally tunable phase shifter 110301, and the output light intensity of the third optical power detector 110321 is maximized by adjusting the fifth thermally tunable phase shifter 110317 , by adjusting the seventh thermally tunable phase shifter 110404 and the ninth thermally tunable phase shifter 110408 to maximize the output light intensity of the off-chip photodetector connected to the third fiber coupler 1111, thereby balancing the manu...

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Abstract

The invention relates to an integrated chip high-dimensional quantum key distribution system, which comprises a laser, a transmitting coding end chip, a receiving decoding end chip and a detector, and is characterized in that the laser is connected with the transmitting coding end chip, the transmitting coding end chip is connected with the receiving decoding end chip, and the receiving decoding end chip is connected with the detector. The emission coding end chip is integrated on the same photon chip by using a silicon-based optical waveguide, and the reception decoding end chip is integrated on the same photon chip by using silicon nitride. The transmitting coding end chip and the receiving decoding end chip in the HD-QKD system based on time phase coding are integrated at the same time, the transmitting coding end chip in the integrated system has a great advantage in coding rate, and the integrated receiving decoding end chip is very small in insertion loss, good in stability and high in reliability. Experimental argumentation and application of a stable, safe, high-speed modulation and high-code-rate HD-QKD protocol can be realized.

Description

technical field [0001] The invention relates to the technical field of quantum information, in particular to an integrated chip-based high-dimensional quantum key distribution system. Background technique [0002] With the vigorous development of the information technology industry, the secure transmission of information is becoming more and more important, and the development of new technologies such as quantum computing will have a subversive impact on the traditional cryptographic system. At the same time, quantum communication technology based on the basic principles of quantum mechanics can theoretically achieve unconditional security of communication. At present, the most mature and widely developed technology in the field of quantum communication is the quantum key distribution (QKD) technology, which mainly includes the preparation, transmission, and detection of quantum states. [0003] In order to improve the key transmission efficiency of QKD, a high-dimensional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04L9/0858H04B10/70
Inventor 韦克金杜永强赵震庚张振荣余宇刘巍石洋
Owner GUANGXI UNIV
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