Multichannel parallel continuous variable quantum key distribution method based on optical frequency comb

A technology of quantum key distribution and optical frequency comb, which is applied in the field of quantum communication, can solve problems such as resource occupation, difficulty in implementation, and processing speed limitation of digital signal processors.

Inactive Publication Date: 2020-03-06
CENT SOUTH UNIV
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Problems solved by technology

OFDM has the advantages of strong resistance to multipath fading and high spectrum utilization, but most of OFDM currently requires Fast Fourier Transform (FFT) or equivalent functions to realize the multiplexing and demultiplexing process, which is affected by the digital signal Processor processing speed limitation
WDM systems are known for

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  • Multichannel parallel continuous variable quantum key distribution method based on optical frequency comb
  • Multichannel parallel continuous variable quantum key distribution method based on optical frequency comb

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Embodiment Construction

[0025] Such as figure 1 Shown is the method flow diagram of the method of the present invention, as figure 2 Shown is a schematic diagram of the principle of the method of the present invention: the optical frequency comb-based multi-channel parallel continuous variable quantum key distribution method provided by the present invention includes the following steps:

[0026] S1. The sending end generates an optical frequency comb as a multi-wavelength source; specifically, the sending end generates a center frequency f s0 , the repetition frequency is f sr The optical frequency comb as a multi-wavelength source;

[0027] S2. the optical frequency comb that step S1 is obtained forms several sub-channels by demultiplexer; Specifically, the center frequency that step S1 produces is f s0 , the repetition frequency is f sr The optical frequency comb of is formed N sub-channels by the demultiplexer, and the number N of sub-channels is equal to the data of the comb line;

[0028]...

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Abstract

The invention discloses a multichannel parallel continuous variable quantum key distribution method based on an optical frequency comb. The method comprises the steps that a sending end generates theoptical frequency comb as a multi-wavelength source; enabling the optical frequency comb to form a plurality of sub-channels through a demultiplexer; independent amplitude modulation and phase modulation are carried out on each sub-channel, and then the sub-channels are combined through a multiplexer and sent to a receiving end; the receiving end generates a local optical frequency comb, and demultiplexes the local optical frequency comb and the received signal; and the sender and the receiver perform post-processing according to the demultiplexing signal and complete final key distribution. According to the invention, a pair of optical frequency combs is used for transmitting a key for parallel transmission and coherent reception, the channel density of a wavelength division multiplexingsystem is higher, and the carrier recovery process is simpler than that of an independent laser; the key rate of the CVQKD system can be greatly improved; the method is high in reliability, good in practicability, easy to implement and high in key rate.

Description

technical field [0001] The invention belongs to the field of quantum communication, and in particular relates to a multi-channel parallel continuous variable quantum key distribution method based on an optical frequency comb. Background technique [0002] One of the most famous applications of quantum cryptography is quantum key distribution (QKD), which allows two distant parties to establish a public key in an untrusted environment. Both discrete variable quantum key distribution (DV-QKD) based on single photon detection and continuous variable quantum key distribution (CV-QKD) based on coherent detection have achieved remarkable achievements. The former encode key information as properties of individual photon pulses, which can be limited by the detection speed and efficiency of individual photon detectors. Fortunately, CVQKD can get rid of this limitation by encoding information on continuous variables, such as the orthogonal number of electromagnetic field patterns. T...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0858
Inventor 黄端潘雅茜毛宜珏
Owner CENT SOUTH UNIV
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