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Quantum key distribution method based on single photon multi-degree of freedom irrelevant to measurement device

A technology for quantum key distribution and measurement equipment, applied in the field of quantum key distribution, can solve the problems of small channel capacity, detector attack, low coding rate, etc., so as to improve the coding rate, improve the utilization rate, and ensure reliability. and safety effects

Active Publication Date: 2019-01-11
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In the middle, the detector was attacked most frequently
[0003] However, the MDI-QKD schemes that have been reported so far only involve a single degree of freedom to increase the security key transmission distance and increase the security key generation rate
However, the existing MDI-QKD scheme encodes information on one degree of freedom, and uses linear optical conditions to implement Bell state measurement, with only a 50% success probability. Therefore, the original MDI-QKD scheme has low coding rate and Disadvantages of small channel capacity

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  • Quantum key distribution method based on single photon multi-degree of freedom irrelevant to measurement device
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  • Quantum key distribution method based on single photon multi-degree of freedom irrelevant to measurement device

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 , the measurement device-independent quantum key distribution method based on single-photon multi-degree-of-freedom of the present invention comprises:

[0020] Step 1: User 1 and User 2 randomly select one of the linear basis and the diagonal basis to encode the single photon state with two degrees of freedom in space and polarization, and send the encoded single photon state to the third party for measurement through the quantum channel device.

[0021] Specifically, in this step, user 1 and user 2 are responsible for the preparation state, and the third-party measuring device is responsible for the measurement state. First, user 1 and user 2 use the polarization controller to randomly prepare one of the four polarization degrees of freedom quantum states, namely: where |H> and |V> are the horizontal and vertical polarization states of t...

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Abstract

The present invention provides a quantum key distribution method based on a single photon multi-degree of freedom irrelevant to a measurement device. The method employs spaces and polarization singlephotons to perform coding on a polarization freedom and a space path freedom and sends the spaces and polarization single photons after coding to a third-party measurement device. The third-party measurement device is employed to perform hyper-entangled Bell state analysis to achieve complete distinguishing of 16 Bell states. Compared to a quantum key distribution protocol scheme irrelevant to anoriginal measurement device, the information is encoded on two degrees of freedom, and a non-linear optical condition is employed to perform complete distinguishing of the 16 Bell states so as to effectively utilize the safe keys and improve the channel capacity. Besides, in order to respond to the safety hole of photon number separation attack, a decoy state technology is used. The quantum key distribution method based on a single photon multi-degree of freedom irrelevant to a measurement device can greatly improve the utilization of the code forming rate and the safe keys and can ensure thereliability and the safety of the transmission process.

Description

technical field [0001] The invention relates to quantum communication technology, in particular to a quantum key distribution method. Background technique [0002] Quantum key distribution (QKD) is an important branch of quantum information science, which allows two legitimate users at a distance to share a security key, and if there is an eavesdropping, it can be discovered. In 1984, Charles H. Bennett of IBM Corporation and Gilles Brassard of the University of Montreal proposed the first QKD protocol, the BB84 protocol, which has attracted widespread attention due to its simplicity and efficiency. However, in actual use, due to the imperfection of the equipment, there are still many loopholes in the quantum key system. Attackers known as quantum hackers can target these vulnerabilities by implementing beam-splitting attacks, time-shifting attacks, and blinding attacks to obtain key information. Among them, the detectors were attacked most frequently. [0003] However, t...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 盛宇波崔政霞周澜
Owner NANJING UNIV OF POSTS & TELECOMM
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