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This nonlinear optical wave guide converts the wavelength of a single-photon signal to a common telecom wavelength. (Photo: L.A. Cicero/Stanford News) This nonlinear optical wave guide converts the wavelength of a single-photon signal to a common telecom wavelength. (Photo: L.A. Cicero/Stanford News)

Stanford physicists set quantum record by using photons to carry messages from electrons over a distance of 1.2 miles

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Stanford physicists have extended the distance they can demonstrate quantum communications. Stanford News reports on progress using photons to communicate between two electrons through more than a mile of fiber optic cable, an important step toward proving the practicality of quantum networks.

Their paper in Nature Communications describes how Stanford Postdoctoral scholar Leo Yu and a team of scientists including Professor Emeritus Yoshihisa Yamamoto have correlated photons with electron spin over a record distance of 1.2 miles. 

"Electron spin is the basic unit of a quantum computer," Yu said. "This work can pave the way for future quantum networks that can send highly secure data around the world."

Read the full article at Stanford News.

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This project builds on a previous project sponsored by the Japan Society for the Promotion of Science investigating quantum cryptography. Now that this communication effect has been extended to a "campus-wide" size in distance it brings quantum networks closer to reality.  The Yamamoto Group continues investigations in quantum information science. Dr Yu is joining a new group headed by Tony Heinz, a scientist known for exploring the properties of nanoscale materials and developing important new tools for that exploration. See the latest research from the ecosystem by exploring the map below!

 

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  • Caption: The Yamamoto group studies quantum information science, with an experimental emphasis on light-matter interactions in semiconductors. Research topics include the optical control of spin qubits, engineering large-scale quantum computing systems, and the condensed matter physics of exciton-polaritons.

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