Phase encoding method, phase encoding device and quantum key distribution system
A phase encoding and phase modulation technology, applied in key distribution, can solve problems such as difficult to realize high-speed quantum key distribution system, analog bandwidth limitation, etc.
Pending Publication Date: 2021-06-01
银川产业技术研究院
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The actual quantum key distribution system mainly adopts the BB84 protocol or the evolved BB84 protocol. The phase encoding needs to randomly generate four different phases (such as 0 degrees, 90 degrees, 180 degrees and 270 degrees). The general method is to use a digital-to-analog converter (DAC) generates four different voltages to drive the electro-optic phase modulator to encode the corresponding four phase values. Due to the limitation of the analog bandwidth of the DAC, this scheme is difficult to achieve a high-speed quantum key distribution system
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[0039] The preferred embodiments of the present invention are described below in detail with reference to the accompanying drawings, which constitute a part of the disclosure of the present application and together with the embodiments of the present invention, serve to explain the principles of the present invention. For the purpose of clarity and simplicity, detailed detailed descriptions of well-known functions and structures of the devices described herein are sometimes omitted so as not to obscure the present invention.
[0040] figure 1 It is a flow chart of a phase encoding method according to a preferred embodiment of the present invention.
[0041] The phase encoding method may be a phase encoding method using high-speed two-phase modulation for a quantum key distribution system. Specifically, as figure 1 As shown, the phase encoding method may include the following steps:
[0042] S101: Receive random first input optical pulses or second input optical pulses from ...
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The invention discloses a phase encoding method and device and a quantum key distribution system. The phase encoding method comprises the following steps: randomly receiving an incident first path of input light pulse or a second path of input light pulse from any one of a first input port and a second input port of a beam splitter; respectively splitting the first path of input light pulse or the second path of input light pulse into two paths of transmission sub light pulses; after the two paths of transmission sub-optical pulses are relatively delayed, combining the two paths of transmission sub-optical pulses into one path of output optical pulse, wherein the one path of output optical pulse is a pair of front and back adjacent output sub-optical pulses; and using a phase modulator to randomly perform one of two phase modulations on at least one of the two transmission sub-optical pulses or at least one of the pair of output sub-optical pulses. According to the method, four phase coding of the output light pulse can be realized by using two phase modulation, the output voltage requirement of a phase modulator driving circuit is reduced, and high-speed phase modulation is easy to realize.
Description
technical field [0001] The invention relates to the technical field of optical transmission security communication, in particular to a phase encoding method, a phase encoding device and a quantum key distribution system using two phase modulations. Background technique [0002] Quantum secure communication technology is a frontier hot field combining quantum physics and information science. Based on quantum key distribution technology and the principle of one-time pad encryption, quantum secure communication can realize the secure transmission of information in open channels. Quantum key distribution is based on the physical principles of quantum mechanics Heisenberg's uncertainty relation, quantum unclonable theorem, etc. It can securely share keys between users, and can detect potential eavesdropping behavior, which can be applied to national defense, government affairs, and finance. , electricity and other areas with high security requirements. [0003] At present, the ...
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IPC IPC(8): H04L9/08H04B10/70H04B10/556
CPCH04L9/0858H04B10/70H04B10/5561
Inventor 许华醒王昌雷林晖张平张瀚
Owner 银川产业技术研究院