A bias-independent Gaussian modulation quantum optical signal generation device and method
A technology of Gaussian modulation and signal generation, which is applied in secure communication devices, photon quantum communication, and key distribution, can solve the problems of Gaussian modulation quantum optical signal difficulty, poor accuracy and stability, and influence, so as to avoid bias drift and improve Effects of Stability and Accuracy
Active Publication Date: 2021-12-17
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a bias-independent Gaussian modulation quantum optical signal generation device and method, aiming at solving the difficulty in generating Gaussian modulation quantum optical signals in the current continuous variable quantum key distribution system, which is subject to The bias drift of the intensity modulator leads to problems of poor accuracy and stability, and the invention improves the generation accuracy and stability of Gaussian modulated quantum optical signals
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[0029] build as figure 2 A bias-independent Gaussian modulation quantum optical signal generation and detection system shown includes the following steps:
[0030] Step S1: The optical pulse signal with high extinction ratio is transmitted in two ways at a ratio of 1 / 99;
[0031] Step S2: Connect the 1 / 100 optical pulse signal to the bias-independent Gaussian modulation quantum optical signal generating device of the present invention to form the required Gaussian modulation quantum optical signal;
[0032] Step S3: Couple the 99 / 100 optical pulse light with the Gaussian modulated quantum optical signal through an optical coupler with a π phase difference after appropriate delay compensation and enter the balance detector for detection, so as to realize the extraction and recovery of the Gaussian signal and obtain the original Gaussian random number signal R*cosU.
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The invention discloses a device and method for generating a bias-independent Gaussian modulation quantum optical signal. The device includes a Mach-Zehnder interferometer, a digital-to-analog conversion module, a random number generation module and an optical attenuator; the Mach-Zehnder interferometer The input end of the input end is connected to the optical pulse signal, and the output end is connected to the optical attenuator; the random number generation module is connected to the digital-to-analog conversion module, and the two output ports of the digital-to-analog conversion module are connected to the Mach-Zehnder interferometer respectively. RF ports for two phase modulators. The present invention uses two phase modulators to form a Mach-Zehnder interferometer, which avoids the influence of the bias drift of the intensity modulator in the traditional method, and improves the stability and accuracy of Gaussian modulation quantum optical signal generation; the present invention adopts Precisely control the optical delay of the two arms of the Mach-Zehnder interferometer without considering the matching of the optical delay and the electrical delay between the intensity modulator and the phase modulator in the traditional method.
Description
technical field [0001] The invention belongs to the technical field of quantum security communication, and in particular relates to a bias-independent Gaussian modulation quantum optical signal generation device and method. Background technique [0002] In recent years, with the development of quantum information theory and technology, the theoretical and experimental research of quantum key distribution technology has made great progress. Among them, the continuous variable quantum key distribution scheme based on coherent state has the advantages of not needing non-classical devices such as single-photon light source and single-photon detector, easy to implement in experiment, and fully compatible with classical optical communication. It has attracted great attention from domestic and foreign academic and industrial circles. [0003] In order to make the mutual information between the communication parties close to the capacity of the optical fiber channel, the coherent s...
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IPC IPC(8): H04B10/556H04B10/70H04L9/08
CPCH04B10/70H04L9/0852H04L9/0858H04B10/5561H04L9/0819
Inventor 王恒徐兵杰黄伟皮峣迪刘金璐邵云樊矾何远杭
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP