Manipulating Light on Superconducting Chips

Light manipulated on a superconducting chip using a switch that shapes released photons in different waveforms could forge new pathways to building the quantum devices of the future — including superfast and powerful quantum computers. Physicists in the lab of…

Light manipulated on a superconducting chip using a switch that shapes released photons in different waveforms could forge new pathways to building the quantum devices of the future — including superfast and powerful quantum computers.

Physicists in the lab of John Martinis, professor of physics at the University of California, Santa Barbara, have developed an unprecedented level of manipulating light on a superconducting chip, a crucial step in achieving controllable quantum devices, according to first author Yi Yin.

“In our experiment, we caught and released photons in and from a superconducting cavity by incorporating a superconducting switch,” said Yin, who worked as postdoctoral fellow in the Martinis lab from 2009 to 2012. She is now a professor at Zhejiang University in Hangzhou, China. “By controlling the switch on and off, we were able to open and close a door between the confined cavity and the road where photons can transmit. The on/off speed should be fast enough with a tuning time much shorter than the photon lifetime of the cavity.”

The switch can also be opened continuously like a shutter. This ability has allowed the investigators to shape the released photons in different waveforms — a key element for the next step they want to accomplish: controlled photon transfer between two distant cavities.

This way of moving information around — sending and catching information — is one of the most important features of the research, said co-author Yu Chen, a postdoctoral fellow in the Martinis lab. “In optics, people imagine sending information from Earth to a satellite and then back — really remote quantum communication,” he said.

“The shutter controls the release of this photon,” Chen said. “You need to perfectly transfer a bit of information, and this shutter helps you to do that.”

The method also could provide ways to transmit signals in a secure manner over long distances, said co-author Jim Wenner, a graduate student in the Martinis lab.

A schematic diagram of part of the superconducting chip used in a University of California, Santa Barbara, experiment to manipulate light for quantum communications. The wavy line is the superconducting cavity. The piece in the bottom right is the superconducting switch. Courtesy of UCSB.
Instead of another shutter, Yin used classical electronics to drive the photon, Wenner said. She then captured the signal in the superconducting cavity, in an area called the meander, or the resonator. Then the shutter controlled the photon’s release.

Wenner explained that the resonator, a superconducting cavity, is etched on the flat, superconducting chip — which is about ¼-in. square. It is chilled to a temperature of about −273.12 ºC.

Findings were reported in Physical Review Letters (doi: 10.1103/PhysRevLett.110.107001).
For more information, visit: www.ucsb.edu

ARTICLE DISCUSSION

MORE VIDEOS »

Vision Library or Vision-Specific IDE: Which is right for you?Commercial machine vision software is currently classified along two lines: the conventional vision library and the vision-specific integrated…MORE INFO » Real-time Profiling for Focusing, M2, Divergence & AlignmentBeam intensity profiling is an essential tool in many aspects of photonics. The precise intensity distribution in a focused laser beam is critical in…MORE INFO » Advanced Light Cure AdhesiveBreakthroughs in adhesive technology enable light curing adhesives to cure under a visible light wavelength of 405 nanometers. Learn how these…MORE INFO »
MORE WHITE PAPERS »

Search the Photonics Buyers’ Guide, the most comprehensive buyers’ resource in the photonics industry.

4000+ companies

1600+ product categories

The authors hope the new National Academies of Science report, “Optics & Photonics: Essential Technologies for Our Nation” will have a major influence on research and manufacturing in the US, unlike its predecessor. How do you think the report will impact those critical areas of the US economy?
I think it will drive commercialization of photonic technologiesI think it will lead to new opportunities and breakthroughs in researchI think it depends on government buy-inI think it depends on industry buy-in

Nerds, terraforming and dinosaurs with ray guns Consider this for a moment: Dinosaurs might still be alive today if they had had a space program.

If dinosaurs —… FULL ARTICLE »

View Feed »Photonics.com http://Photonics.com is the leading source for photonics news, research, business updates, new products, and industry events. View Feed »Laura S. Marshall managing editor, laurin publishing (photonics spectra, biophotonics, europhotonics); interests: photonics, lasers, light, science, physics, cameras, biotech View Feed »Melinda Rose senior editor, Photonics.com, interested in lasers, optics, MEMS, fiber optics, etc. I also host Light Matters weekly newscast and write for Photonics Spectra. View Feed »Photonics Media Offering global coverage of optics, lasers, imaging, fiber optics, electro-optics and photonics component manufacturing