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Qubit needle detected in a haystack of nuclear spins – Physics World

March 1, 2021

Qubit needle detected in a haystack of nuclear spins – Physics World

In the new work, the Cambridge team injected such a single nuclear excitation, known as a nuclear magnon, into dots made of indium gallium arsenide. The feat, which involves laser light and a single electron that acts like a spin-herding “sheepdog”, might aid the development of a quantum Internet. “If we imagine our cloud of spins as a herd of 100 000 sheep moving randomly, one sheep suddenly changing direction is hard to see,” he says. The real hurdle, Atatüre explains, came when he and his colleagues tried to sense the presence of the stored quantum information in the ensemble of spins. One way to overcome this is to protect the information-containing spins by “hiding” them in the cloud of spins from the 100 000 atomic nuclei within each quantum dot. “Being able to do this will allow us to overcome a major building block for the quantum Internet: a deterministic quantum memory connected to light,” Atatüre tells Physics World. However, for quantum devices to reach their full potential, researchers need to find some way of networking them into a quantum Internet.

Article from physicsworld.com.