温度或盐度对水下量子密钥分配影响的研究

Study on the Effect of Temperature or Salinity on Underwater Quantum Key Distribution

水下量子密钥分配对保障水下通信安全具有十分重要的意义。本文研究不同温度或盐度的海水对光传输以及水下量子密钥分配的影响。本文在有限的范围内改变水槽中水的温度或盐度,在温盐均匀和有温盐差的海水信道中对出射光进行偏振测试,并进行了基于偏振编码的BB84协议水下量子密钥分配实验研究。研究表明:偏振光经过温盐均匀或有温盐差的模拟海水后其偏振态几乎不发生变化;在温盐均匀的海水中,温度或盐度的变化几乎不改变误码率,但在温盐不均匀的海水中,误码率随温盐差的增大呈增加趋势。

Underwater quantum key distribution plays an important role in ensuring the security of underwater communication.In this paper,the effects of seawater with different temperatures or salinities on light transmission and underwater quantum key distribution were studied.We changed the temperature or salinity of the water in the tank within a limited range,measure the polarization of the received light in temperature or salt uniform channel and temperature or salt difference channel,and carred out the experiment of underwater quantum key distribution based on polarization encoding BB84 protocol.The results show that the polarization of light hardly changes after passing through simulated seawater with uniform temperature and salinity or with temperature and salinity difference.And the change of temperature or salinity in uniform seawater hardly influences the bit error rate.However,in seawater with nan-unirorm temperature and salinity,the bit error rate increases with the increase of temperature and salinity difference.