quantum communication

A quantum computer has been operated in space for the first time, according to a report by ScienceAlert. The milestone suggests quantum computing technology can function in the harsh conditions of orbit, opening the door to space-based quantum research and potentially quantum communication networks between satellites. Details about the hardware involved and the mission responsible have not yet been widely reported.

Researchers report a quantum memory that has stored single photons for a record length of time, a result described as a major step towards building a quantum internet. Long-lived storage of individual light particles is a key requirement for quantum repeaters, the devices needed to send entangled signals across continental distances. The achievement is drawing attention as a milestone in quantum communication research.

Researchers at Nanjing University report an advance in quantum key distribution, achieving boosted key rates for networks serving three users simultaneously. The work targets practical multi-user quantum communication, where distributing secure keys to several parties at once has so far limited performance. Higher key rates could make quantum-secured communication networks more viable for real-world deployment.

A quantum communication link has been shown operating over fiber optic cable already carrying 400G Ethernet and 5G traffic, demonstrating that quantum networking can coexist with conventional high-capacity telecommunications on deployed infrastructure rather than requiring dedicated lines. This points to a cheaper path for integrating quantum-secure communications into existing networks.