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Free space continuous variable quantum key distribution protocol based on discrete modulation

A technology of quantum key distribution and free space, which is applied in the field of communication, can solve the problems of unseen patents, unseen discrete modulation free space continuous variable quantum key distribution research and patents, etc.

Active Publication Date: 2020-06-09
TIANJIN NORMAL UNIVERSITY
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  • Claims
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Problems solved by technology

However, the existing research is based on the Gaussian modulation method, and directly quotes or expands the transmission coefficient fluctuation model. It lacks the analysis of the physical mechanism of the discrete modulation quantum signal transmission in the free space channel, and there are no patents related to it.
[0008]In summary, there are no researches and patents on discrete modulation free space continuous variable quantum key distribution at home and abroad

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  • Free space continuous variable quantum key distribution protocol based on discrete modulation
  • Free space continuous variable quantum key distribution protocol based on discrete modulation
  • Free space continuous variable quantum key distribution protocol based on discrete modulation

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Embodiment Construction

[0041] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0042] In describing the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood a...

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Abstract

The invention provides a free space continuous variable quantum key distribution protocol based on discrete modulation, which comprises the following steps that: a key sender Alice uses an independentoriginal data stream to discretely modulate continuous laser in a specified clock period, and generates a light quantum signal after passing through an attenuator; the discretely modulated light quantum signal is transmitted through a free space quantum channel and then reaches a secret key receiver Bob, and the Bob measures two regular components of a light quantum state by adopting a zero beatdetector; the Bob sends side information to the Alice through a classical channel, and the Alice executes reverse harmony to correct data of the Alice and is associated with a quantum state measurement value of the Bob; then parameter estimation and private amplification are executed, and finally a secret key is generated. According to the high-speed continuous variable quantum key distribution protocol based on discrete modulation, high-speed free space continuous variable quantum key distribution is achieved, and meanwhile the safety of the protocol is proved by integrating various atmospheric turbulence effects.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a free space continuous variable quantum key distribution protocol based on discrete modulation. Background technique [0002] Quantum key distribution is one of the most important applications of quantum communication. It uses quantum channels for non-orthogonal quantum state exchange and classical channels for data processing, so that Alice and Bob, legal users who are space-separated, can share keys. The eavesdropper Eve must measure the quantum state in order to steal the key information. According to the basic physical laws of quantum mechanics, any eavesdropping behavior that interacts with the quantum system will inevitably lead to changes in the quantum state, increase noise, and thus be legally communicated. Fang found out. Quantum key distribution plus one-time pad system can provide unconditional security of information, and can fundamentally solve i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04L9/0852H04L9/0858H04B10/70
Inventor 李明李力
Owner TIANJIN NORMAL UNIVERSITY
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