Researchers break world record for quantum-encrypted communications
. The work could eventually lead to hack-proof communication, as any eavesdropping attempt on a quantum line can be instantly detected.
QSDC uses the principal of entanglement to secure networks. Quantum physics dictates that entangled particles are linked, so that if you change the property of one by measuring it, the other will instantly change, too — effectively making hacking impossible. In theory, the particles stay linked even if they're light-years apart, so such systems should work over great distances.
The same research team set the previous fiber record, and devised a"novel design of physical system with a new protocol" to achieve the longer distance. They simplified it by eliminating the"complicated active compensation subsystem" used in the previous model."This enables an ultra-low quantum bit error rate and the long-term stability against environmental noises."
As a result, the system can withstand much more so-called channel loss that makes it impossible to decode encrypted messages. That in turn allowed them to extend the fiber from 28.3km to the record 102.2 km distance."The experiment shows that intercity quantum secure direct communication through the fiber is feasible with present-day technology," the team wrote in
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