Open AccessResearch Progress Of Quantum Repeaters
Author(s) -
Qiao Ruihong,
Ying Meng
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1237/5/052032
Subject(s) - repeater (horology) , quantum key distribution , quantum channel , quantum information science , quantum network , quantum capacity , quantum entanglement , telecommunications , computer science , amplitude damping channel , quantum , channel (broadcasting) , quantum information , free space , key (lock) , photon , topology (electrical circuits) , electronic engineering , physics , quantum mechanics , electrical engineering , engineering , optics , encoding (memory) , computer security , artificial intelligence
At present, the main components of quantum communication channels are optical fibers and free space. However, whether it is a fiber channel or a free-space channel, the channel in which it propagates is affected by noise, resulting in loss or absorption of photons. Experimental studies have shown that the quantum key can basically meet the requirements of the local area network, and the safety distance is about 100km. However, if you want to achieve longer distance distribution, you can’t do without quantum repeaters. The quantum repeater can divide the long-distance communication distance into several segments, and then perform quantum key distribution in several segments respectively; then establish a longer-distance EPR pair between adjacent nodes, and establish an EPR pair to utilize entanglement switching and Entanglement purification technology; finally repeat the above steps, and finally achieve long-distance information transmission. The development of quantum repeaters can solve the communication problems facing the world and promote the replacement of global communication methods.