自由空间量子隐形传态实验中远程光符合的电子学系统研制

Electronic system for long-distance photon coincidence in free-space quantum teleportation

在两光子自由空间量子隐形传态实验方案中,设计了一套远程光符合的电子学系统,系统最小符合时间窗口约2ns.整个系统包括编码、解码、延时、高压驱动、符合、计数等模块.此系统实现了将实验中的经典信息和量子信息耦合在一起并通过自由空间传送到另一端进行在线符合来判定纠缠光子对.系统中编码模块将Alice端Bell基测量结果的时间标记信息和通道信息叠加在一起,通道信息的编码使用了奇偶校验和汉明码来降低事例丢失率和出错率,解码模块则分离出经典的时间标记信息和通道信息并做相应操作.完成了800m距离的两光子自由空间量子隐形传态实验,实验结果表明用本系统进行远程的实验是可行的.

For the two-photon quantum teleportation project in free space, an electronic system for photon coincidence over long-distance was designed, and the minimum coincident time window of the system was about 2 ns. The system consists of modules for coder, decoder, delay, high voltage driver, coincidence and counter, etc. In the system, the classic information and quantum information were coupled and sent to another point through free space, where the entangled photons were figured out by on-line coincidence. The coder put the time tag information and the channel information in the Alice end＇s Bell state measurement together. Parity check and Haming code was used to transform the channel information to reduce the event＇s loss rate and error rate. The decoder can separate the time tag information and the channel information to perform corresponding operations. The experiment of two-photon quantum teleportation over a distance of 800 meters has been completed, results show the feasibility of using this system for long-distance experiments.