China in Quantum Transmission

China China satellite China quantum computing Quantum Satellite China quantum satellite Quantum communications space space news

According to QUESS lead scientist and Chinese Academy of Sciences (CAS) academician Pan Jianwei, the communication from the satellite to the ground stations occurred over a distance between 645km and 1,200km.

The messages were transmitted via light, and any attempt to "eavesdrop" on the communication would be instantly detected. The photon pairs were demonstrated to be still entangled after travelling long distances and Bell's inequality was shown to be violated under strict Einstein locality conditions.

Quantum Key Distribution system context diagram. The tech would also make it far more hard for governments to spy on private communications - something that global leaders and agencies around the world have a vested interest in.

"Satellite-based quantum key distribution can be linked to metropolitan quantum networks where fibers are sufficient and convenient to connect numerous users within a city over 100 km".

Last August, China launched a quantum satellite into space, a move which was called a "notable advance" by the Pentagon. Cooperating with Micius are three ground stations (Delingha in Qinghai; Nanshan in Urumqi, Xinjiang; and Gaomeigu Observatory in Lijiang, Yunnan). "I am not aware of any specific USA research that focuses specifically on ground-to-satellite quantum teleportation, [although] there have been experiments demonstrating quantum teleportation and pushing the limits of distance".

The satellite sends messages with entangled photons, which becomes disturbed if eavesdropping or message interception is attempted. To optimize link efficiency, the scientists combined narrow-beam divergence with a high-bandwidth and high-precision acquiring, pointing, and tracking (APT) technique. The code was sent at a transmission efficiency 20 times larger than by using an equivalent length of optical fibre and is "unhackable" as any interceptions would change the quantum state of the code and destruct it.

With the use of the satellite, Chinese researchers at the Quantum Experiments at Space Scale (QUESS) project, were able to transmit secret messages from space to earth at a further distance than ever before. Another immediate application is to exploit distributed entanglement to perform a variant of quantum teleportation protocol for remote preparation and control of quantum states.

China has sent a quantum-based wireless message that it says can not be intercepted without detection.

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