Quantum encoder whose polarization state is modulated by phase and decoder and its application

A phase modulator and quantum encoding technology, applied in the field of polarization compensation, can solve problems such as difficulty in high-speed encoding, halving of efficiency, and difficulty in generating entangled photons
CN1224210CInactive Publication Date: 2005-10-19SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2005-10-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a quantum coder with phase modulated polarization state, decoder and polarization compensating method used in the quantum secret communication, four-state quantum coder and decoder are formed from a phase-polarization controller and a true random generator, and the six-state quantum coder and decoder are formed from two phase-polarization controllers and a synchronous trigger, in the quantum secret communication it utilizes the quantum coder and decoder to effectively compensate the polarization state distortion resulted in the course of signal transmission, so that its error code rate can be greatly reduced to 10 to the minus fifth, and its modulation speed can be up to several GHz from tens Hz.
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Description

technical field

[0001] The invention relates to special equipment for quantum secure communication in the communication field and an application method thereof, in particular to a quantum encoder and decoder for phase modulation polarization state and a polarization compensation method for quantum secure communication. Background technique

[0002] In the existing quantum cryptography communication technology, there are three types of protocols such as BB84 protocol, B92 protocol and E91 protocol, and three coding methods such as two-state coding, four-state coding and six-state coding. The BB84 protocol belongs to the four-state coding method, while the B92 protocol and the E91 protocol belong to the two-state coding method. The efficiency of the four-state coding method is relatively high, while the efficiency of the two-state coding method is halved.

[0003] The BB84 protocol usually adopts the phase modulation encoding method, that is, two ide...

Claims

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