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Bejing sets new record for quantum secure direct communication

by on19 April 2022


Quantum Message flung over 102.2 km

Researchers in Beijing have set a new quantum secure direct communication (QSDC) world record of 102.2 km (64 miles), smashing the previous mark of 18 km (11 miles).

According to the Eurasian Times transmission speeds were extremely slow at 0.54 bits per second, but still good enough for text message and phone call encryption over a distance of 30 km (19 miles).

Research lead Long Guilu said the work will 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 so that since entangled particles are linked, changing the property of one by measuring it will cause another to instantly change.

In theory, the particles stay linked even if they're light-years apart, so such systems should work over great distances, depending if the quantum cats can be bothered.

The same research team set the previous fibre 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 (QBER) 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 fibre from 28.3km to the record 102.2 km distance. "The experiment shows that intercity quantum secure direct communication through the fibre is feasible with present-day technology.

 

Last modified on 19 April 2022
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