The College of Strathclyde is main a three-year European analysis undertaking to develop cold-atom quantum reminiscences for long-distance networks spanning fiber and free-space optical hyperlinks.
The Atom-Gentle Free-Area Quantum Optics Networking (AL FreSQO) undertaking will examine how quantum reminiscences could be integrated into repeater units to assist distribute entanglement past the space potential over a direct connection. The undertaking may even develop wavelength-conversion programs designed to attach photons touring at telecommunications wavelengths with cold-atom reminiscences working at totally different wavelengths.
“Quantum indicators are fragile and simply misplaced over lengthy distances,” Daniel Oi, a professor in Strathclyde’s Division of Physics and AL FreSQO’s lead coordinator, famous in a press release. “As a result of they’ll’t be copied or amplified, we’d like new methods to increase their vary.”
Quantum repeaters divide an extended connection into shorter segments, set up entanglement throughout every phase, and be part of them utilizing entanglement swapping. Quantum reminiscences briefly retailer quantum states whereas entanglement is established throughout different components of the community. This buffering helps synchronize the operations required to attach the person segments.
Connecting fiber and free-space hyperlinks
AL FreSQO will mix cold-atom reminiscences with free-space optical hyperlinks, which transmit photons by means of the air moderately than optical fiber.
Free-space hyperlinks are vital the place fiber networks usually are not sensible. Potential functions embrace quantum connections involving satellites, plane, ships, trains, and street automobiles.
“Frequency conversion permits us to attach free-space and fiber networks by matching totally different wavelengths, giving better flexibility in how quantum networks are constructed,” Oi famous.
The researchers defined the chosen applied sciences might additionally cut back reliance on the cumbersome and energy-intensive cryogenic gear required by some different quantum-memory platforms.
Aidan Arnold, a reader in physics at Strathclyde, will conduct quantum non-demolition experiments meant to detect a photon with out destroying it.
The undertaking might finally assist safe communications, clock synchronization, distributed sensing, and connections forming a part of a future quantum web.
Strathclyde is working with the colleges of Southampton and Padua, Humboldt College of Berlin, Sabancı College, and College of Padua spinout ThinkQuantum.
AL FreSQO has acquired roughly $2.3 million by means of the European Fee-supported QuantERA program involving greater than 40 research-funding organizations.
The undertaking was considered one of 39 chosen from 287 proposals submitted to the 2025 QuantERA funding name. The profitable initiatives acquired roughly $61.7 million in whole funding.
