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Continuous variable quantum key distribution method and system based on orbital angular momentum

A technology of quantum key distribution and orbital angular momentum, which is applied to key distribution, can solve the problem that channel coding is difficult to resist the influence of strong turbulence, and achieve the effects of high reliability, noise reduction and low cost

Active Publication Date: 2019-11-15
CENT SOUTH UNIV
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Problems solved by technology

However, channel coding is difficult to resist the influence of strong turbulence

Method used

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  • Continuous variable quantum key distribution method and system based on orbital angular momentum
  • Continuous variable quantum key distribution method and system based on orbital angular momentum
  • Continuous variable quantum key distribution method and system based on orbital angular momentum

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Embodiment Construction

[0025] Such as figure 1 Shown is the schematic flow chart of the method of the present invention: the continuous variable quantum key distribution method based on orbital angular momentum provided by the present invention comprises the following steps:

[0026] S1. The sender and the receiver perform their respective initializations; specifically including initializing the signal source, random number source, modem, detector and control circuit in the CVQKD system;

[0027] S2. The sender divides the coherent light source into signal light and auxiliary light through an optical beam splitter, and modulates the signal light, including phase modulation and amplitude modulation;

[0028] In the specific implementation, the coherent state normal components X and P are coded and modulated by phase and amplitude modulation, so that the signal light obeys a Gaussian distribution with a mean value of zero and a variance of VA; the value range of VA is 0<VA<100;

[0029]S3. The sender...

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Abstract

The invention discloses a continuous variable quantum key distribution method based on orbital angular momentum. The method comprises the following steps: initializing; obtaining the signal light andthe auxiliary light and modulating the signal light by a sender; modulating the modulated signal light into signal light orbital angular momentum beams with different modes, carrying out orbital angular momentum multiplexing, carrying out polarization multiplexing together with auxiliary light, and sending the signal light orbital angular momentum beams to a receiver; receiving the optical signalthrough polarization demultiplexing by the receiver; modulating the auxiliary light into auxiliary light orbital angular momentum beams with different modes, demodulating the received and demultiplexed orbital angular momentum multiplexed signal light orbital angular momentum beams with different modes to obtain the value of the regular position X or the regular momentum P of the signal light sentby the sender and the randomly measured signal light, and obtaining the final value and the key data which are sent by the sender. The invention also discloses a system for realizing the orbital angular momentum-based continuous variable quantum key distribution method. According to the method, the system communication capacity can be improved and the noise introduced by an atmospheric channel isreduced.

Description

technical field [0001] The invention specifically relates to a continuous variable quantum key distribution method and system based on orbital angular momentum. Background technique [0002] Quantum key distribution (QKD) is one of the important applications of quantum cryptography, which allows two legitimate parties, Alice and Bob, to exchange a public key through an untrusted environment. Its security is guaranteed by the laws of quantum mechanics. At present, the commonly used key distribution methods in quantum communication include discrete variable (DV) QKD and continuous variable (CV) QKD. CVQKD encodes the quadratic property information of the Gaussian state and is an alternative to DVQKD with a higher key distribution rate. With the development of research in recent years, CVQKD has become a hot spot in QKD research due to its advantages of high detection efficiency and low experimental cost. The Gaussian-modulated CVQKD protocol has been proven to be secure aga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/11H04B10/54H04B10/556H04B10/70
CPCH04B10/11H04B10/541H04B10/5561H04B10/70H04L9/0819H04L9/0852
Inventor 黄端金迪
Owner CENT SOUTH UNIV
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