Phys.org May 23, 2023
An international team of researchers (Austria, France) has presented a quantum repeater node based on trapped ions that act as single-photon emitters, quantum memories, and an elementary quantum processor. They demonstrated the node’s ability to establish entanglement across two 25-km-long optical fibers independently, then to swap that entanglement efficiently to extend it over both fibers. The resultant entanglement was established between telecom-wavelength photons at either end of the 50 km channel. Finally, they calculated the system improvements to allow for repeater-node chains to establish stored entanglement over 800 km at hertz rates revealing a near-term path to distributed networks of entangled sensors, atomic clocks, and quantum processors… read more. TECHNICAL ARTICLEÂ
Quantum repeater concept. Credit: Phys. Rev. Lett. 130, 213601, 22 May 2023