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Continuous variable quantum key distribution variable transmittance and data bit frame synchronization method

A quantum key distribution and data synchronization technology, applied in the field of computer information, can solve problems such as synchronization difficulties and low signal-to-noise ratio, and achieve the effects of improving operating efficiency, facilitating integration, and resisting random phase drift.

Active Publication Date: 2021-03-12
上海循态量子科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

Since the CVQKD system works under low-light conditions, the received signal at the receiving end has an extremely low signal-to-noise ratio, which brings great difficulties to synchronization

Method used

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  • Continuous variable quantum key distribution variable transmittance and data bit frame synchronization method
  • Continuous variable quantum key distribution variable transmittance and data bit frame synchronization method
  • Continuous variable quantum key distribution variable transmittance and data bit frame synchronization method

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Embodiment 1

[0051] A continuous-variable quantum key distribution (CVQKD) variable transmittance and data bit frame synchronization method. This method is mainly applicable to CVQKD systems such as free space CVQKD or underwater CVQKD where the channel transmittance is variable. In contrast, the channel transmittance of traditional optical fiber CVQKD systems can usually be regarded as a constant. In the optical fiber CVQKD system, it is only necessary to synchronize the data of Alice and Bob, and then estimate the channel transmittance through the parameter estimation step. In CVQKD systems such as free space or underwater, we need to separate a part of the light to monitor in real time to obtain the channel transmittance of each pulse, and also need to synchronize the Alice-side data, Bob-side data and channel transmittance data. , this scheme proposes a method for synchronizing Bob's data and channel transmittance data. The main steps of the method are as follows: Step A: constructing...

Embodiment 2

[0069] In the continuous variable quantum key distribution system, the quantum state sent by Alice (the sender) is subject to Gaussian modulation, that is, the position and momentum of the quantum state are subject to Gaussian distribution. The sending end makes the transmitted data obey the Gaussian distribution by loading a signal that obeys Rayleigh distribution on the amplitude modulator AM and loading a uniformly distributed signal on the phase modulator PM. For the convenience of discussion, the following analysis takes the position component X of the quantum state as an example, and has the same result for the momentum component P. For the X component and P component that obey the Gaussian distribution, when modulated at the sending end, the purpose of encoding the X component and P component in the light field is achieved by modulating the amplitude and phase of the optical signal. The modulation amplitude is The phase is θ=angle(X+iP). Such as figure 1 As shown, ...

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Abstract

The invention discloses a continuous variable quantum key distribution variable transmittance and data bit frame synchronization method, and the method is characterized in that the method comprises the following steps: A, constructing a synchronization frame: constructing a data synchronization frame and a channel transmittance synchronization frame, modulating the data synchronization frame and the channel transmittance synchronization frame at the frame header of each frame, and then modulating Gaussian distribution data; B, calculating a synchronization bit: carrying out correlation operation on the received data, and determining the synchronization bit in the data. According to the synchronization method provided by the invention, only a special data synchronization frame and a specialchannel transmittance synchronization frame need to be modulated by a sending end during modulation, and a synchronization frame signal can be completed in a receiving end in a process of calculatingcorrelation to perform synchronization after two parties have good quotient through a classical channel in advance; compared with a method for synchronizing measurement results published by comparingAlice and Bob, the method has the advantages that the link of communication between the Alice and the Bob is omitted, the operation efficiency of the system is improved, and integration is facilitated.

Description

technical field [0001] The invention relates to the field of computer information technology, in particular to a continuous variable quantum key distribution variable transmittance and data bit frame synchronization method. In particular, it relates to a bit-frame synchronization method for a quantum key distribution system (such as a free space or underwater CVQKD system, etc.) where the channel transmittance cannot be regarded as a constant. Background technique [0002] Since the 21st century, with the rapid development of information technology, a star-studded information technology and information industry have emerged, technologies in the fields of optical fiber communication and wireless communication have developed rapidly, and fields such as the Internet, Internet of Things, big data, and artificial intelligence have flourished. At the same time, The importance of information security is also increasing day by day. Quantum key distribution is a key sharing scheme w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L27/26H04J3/16
CPCH04L9/0852H04L27/2656H04J3/1664
Inventor 黄鹏王平曾贵华
Owner 上海循态量子科技有限公司
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