Quantum cryptography communication device

Quantum key distribution terminal

release time:2016-10-20   Click on:2049


Quantum cryptography is the first practical quantum information technology. It uses nocloning theorem and uncertainty principle of quantum mechanics. Password information shall be transferred through a single photon, and key distribution will be achieved between legitimate users via a quantum channel. Different from public key cryptosystems, the security is based on the basic physical laws of quantum mechanics, instead of being guaranteed by the computational complexity. Therefore it is called unconditional security. It provides us with a secure secret communication which is unlikely to be eavesdropped and broken.

Quantum key distribution terminal is the dedicate device to realize quantum cryptography technology. The international advanced Faraday - Michelson (F-M) phase encoding scheme is being used which is the most stable quantum cryptography communication solution in the world currently. The scheme has already obtained the patent licensing in China, the United States, Japan, etc. and the first prize of technological invention of Chinese Ministry of Education. The device conducts key agreement by the quantum state property of light to realize the security of the key distribution, key management, and other functions, and provide a key interface for upper applications. It is the core device in quantum cryptography communication network.

Key properties

• Security: decoy state BB84 key distribution technology, real-time detection for the line

• Universality: direct access to the existing optical fiber communication network, intelligent key service center

• Stability: international advanced F-M interference system, completely immune line disturbance, without human intervention (see image below)


Schematic diagram of F-M interference system  


Result of stability test on railway bridge duct optical cable of Wuhu Yangtze River Bridge
(Stable operation 5000 hours)

Applied range

Public information security domain such as in the party, the politics,the military, the finance, the electricity, etc.  
Multi-area synchronous true random source
High secure key service center
Quantum cryptography teaching experiment

Technical parameters

phase encoding + decoy state BB84 agreement

Parameter name 

    Index parameter   





coded scheme  

Phase encoding + decoy state BB84 agreement /

trigger frequencies** 



average bit-error-ratio(@25km)  



    Secure key formation rate(@25km)      



Power supply   




Power consumption   



   dimension(W×H×D mm3)     

3U/4U standard chasis

* means typical value, actual wavelength can be determined by the requirement
** means typical value, actual optical pulse repetition rate can be determined by the requirement

Parameter table for selection


                                     ①   ②     

    100 indicates the first generation, 200 indicates the second generation     
Indicate the trigger frequency

T means the transmitting terminal, R means the receiving terminal, TR means transmission & receipt

X means different requirements of different users