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Two range records have just been reported: Chinese researchers entangled cold atoms across 420 kilometres, four times the previous mark, while a Berlin group teleported quantum signals through 30 kilometres of commercial fibre, which the FAZ calls a precondition for a quantum internet.
A quantum internet would connect distant nodes through entanglement and teleportation instead of conventional signals. The core obstacle is distance: quantum states degrade quickly over fibre and free space, so progress is measured in kilometres covered. Competing research groups, among them teams in China and Germany, have been pushing these range records upward.
Chinese researchers entangled cold atoms across 420 kilometres, four times the previous record, the South China Morning Post reported on Friday. In Berlin, researchers teleported quantum signals over 30 kilometres of commercial fibre, which the FAZ calls a precondition for a quantum internet.