Communications of the ACM
New Route to a Quantum Internet
The researchers designed a nanoscopic silicon waveguide to capture the photons emitted by the erbium ion and send them as high-fidelity signals over the fiber optic cable.
Credit: Jeff Thompson et al
Princeton University researchers have developed a method for connecting quantum devices over long distances that involves sending telecom-ready light emitted from a single ion implanted in a crystal.
The rare earth ion used in the new device does not require signal conversion because it emits light at an optimal infrared wavelength.
The device is comprised of a calcium tungstate crystal containing erbium ions that emit light through the crystal when pulsed with a special laser, and a nanoscopic piece of silicon carved into a J-shaped channel located on top of the crystal, which captures and moves individual photons encoded with information from the ion into the fiber optic cable.
The researchers observed up to 80% suppression of individual photons at the interferometer output, which Princeton's Salim Ourari said demonstrated the signal was significantly above the hi-fi threshold.
From Princeton University
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