A new atomic device sends high-fidelity quantum information over fiber optic networks. Researchers have unveiled a new way to connect quantum devices over long distances, a necessary step toward allowing the technology to play a role in future communications systems. While today’s classical da
Princeton researchers introduce a new method for constructing quantum repeaters using telecom-ready light from a single ion, with calcium tungstate emerging as the optimal material. Future work aims to improve quantum state storage duration.Researchers have unveiled a new way to connect quantum devices over long distances, a necessary step toward allowing the technology to play a role in future communications systems.
Other leading quantum repeater designs emit light in the visible spectrum, which degrades quickly over optical fiber and must be converted before traveling long distances. The new device is based on a single rare earth ion implanted in a host crystal. And because this ion emits light at an ideal infrared wavelength, it requires no such signal conversion, which can lead to simpler and more robust networks.
They winnowed the list of candidate materials from hundreds of thousands down to a few hundred, then a couple dozen, then three. Each of the three finalists took half a year to test. The first material turned out to be not quite clear enough. The second caused the erbium to have poor quantum properties. But the third, the calcium tungstate, was just right.
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