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Light quantum phase modulating system

An electro-optical phase modulation and phase modulation technology, which is applied in the field of quantum cryptography, can solve problems such as difficulty in meeting the modulation rate above 1Gbps, and achieve the effect of avoiding the limitation of the modulation rate and improving the working speed

Active Publication Date: 2012-10-17
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, due to the limitations of the establishment and stabilization time of digital-to-analog conversion and the switching time of analog switches, it is difficult for these methods to meet the requirements of modulation rates above 1Gbps

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Embodiment Construction

[0016] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to avoid confusing the understanding of the present invention.

[0017] The main purpose of the present invention is to provide a technical solution that can satisfy the random modulation of quantum state of the quantum key distribution system above 1 GHz. In the present invention, the phase modulation is performed based on the high-speed serial data communication interface, without digital-to-analog conversion or analog switch, which avoids the limitation of the conversion or switching time to increase the modulation rate, so that the work of the entire quantum key distribution system can be effectively improved speed.

[0018] The present invention can utilize the independent parallel / serial conversion chip, or the high-speed serial commun...

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Abstract

The invention provides a light quantum phase modulating system, which utilizes a high-speed serial data transceiver to generate two paths of high-speed electric pulse signals. After the signals pass through a gain network, the signals are used for driving an electro-optic phase modulator (PM) so as to realize the phase modulation of light quantum signals. According to the light quantum phase modulating system, a digital to analog converter or an analogue switch does not need to be used and a high-speed digital signal is directly utilized to realize a four-phase modulating function needed by a BB84 quantum secrete key distribution protocol; and therefore, the limitation to a modulating speed by links including digital-to-analogue conversion, analogue switch switching and the like can be avoided. A dual-pole electro-optic phase modulator scheme also can effectively reduce the range requirements of a modulation driving signal; and the light quantum phase modulating system is good for realizing high-speed phase modulation meeting requirements of quantum secrete key distribution.

Description

technical field [0001] The invention relates to the field of quantum cryptography, and specifically relates to an optical quantum phase modulation system, which is used for high-speed quantum key distribution and can realize the high-speed random modulation function of the optical quantum state required by the quantum cryptography system. Background technique [0002] With the development of communication technology, especially in the field of secure communication, the demand increases. The superiority of quantum secure communication with absolute security in theory has been paid more and more attention. Quantum key distribution (QKD) is the core of quantum cryptography, which can realize unconditionally secure key distribution in the sense of cryptography among remote users. Combining quantum key distribution technology with One-time-pad (One-time-pad) encryption can realize unconditionally secure confidential communication. Therefore, quantum cryptography has received ex...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/155
CPCH04B10/70H04B10/548H04B10/5561H04L9/08H04L9/0852
Inventor 陈巍王双银振强黄大骏杨阳周政何德勇李玉虎韩正甫王永纲郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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