Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UCSB physicists make discovery in the quantum realm

05.03.2013
Physicists at UC Santa Barbara are manipulating light on superconducting chips, and forging new pathways to building the quantum devices of the future –– including super-fast and powerful quantum computers.

The science behind tomorrow's quantum computing and communications devices is being conducted today at UCSB in what some physicists consider to be one of the world's top laboratories in the study of quantum physics. A team in the lab of John Martinis, UCSB professor of physics, has made a discovery that provides new understanding in the quantum realm and the findings are published this week in Physical Review Letters.


This is a schematic diagram of part of the superconducting chip. The wavy line is the superconducting cavity. The piece in the bottom right is the superconducting switch.

Credit: UCSB

"As one crucial step of achieving controllable quantum devices, we have developed an unprecedented level of manipulating light on a superconducting chip," said first author Yi Yin. Yin worked on the project when she was a postdoctoral fellow in the Martinis Lab from 2009 to 2012. She relocated to her native China last fall, where she is now a professor at Zhejiang University in the city of Hangzhou.

"In our experiment, we caught and released photons in and from a superconducting cavity by incorporating a superconducting switch," said Yin. "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."

She explained that not only can the switch be in an on/off state, it also can be opened continuously, like a shutter. In that way, the research team was able to shape the released photons in different wave forms –– a key element for the next step they want to accomplish: controlled photon transfer between two distant cavities.

Co-author Yu Chen, also a postdoctoral fellow in the Martinis lab, said that this way of moving information around –– sending and catching information –– is one of the most important features of this research. "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," said Chen. "You need to perfectly transfer a bit of information, and this shutter helps you to do that."

Co-author Jim Wenner, a graduate student in the Martinis lab, explained another application. "Another one, again with communication, would be providing ways to transmit signals in a secure manner over long distances," said Wenner.

He said that, instead of another shutter, Yin used classical electronics to drive the photon. She then captured the signal in the superconducting cavity, in an area called the meander, or the resonator. Then the shutter controlled the release of the photon.

Wenner explained that the resonator, a superconducting cavity, is etched on the flat, superconducting chip –– which is about one quarter of an inch square. It is chilled to a temperature of about minus-273.12 degrees Celsius.

Yin completed her B.S. in physics at the University of Science and Technology in China, before going to Harvard University to earn a Ph.D. in physics. Of the time she spent at UCSB, Yin said: "The Martinis group is one of the best groups in the field of superconducting quantum devices in the world, which strongly attracted me to find the opportunity to work here.

"The whole group is a very young, energetic, and creative team, with the strong leadership and support of Professor John Martinis. I am very happy to have learned the advanced techniques and to have studied the exotic quantum devices of this group." She credits the support of the entire UCSB team, especially important technique support from co-authors Yu Chen, Daniel Sank, Peter O'Malley, Ted White, and Jim Wenner.

In addition to Martinis, the other co-authors from UCSB are Rami Barends, Julian Kelly, Anthony Megrant, Charles Neill, Amit Vainsencher, and Andrew Cleland. Additional contributors are Erik Lucero, now with the IBM T.J. Watson Research Center; Matteo Mariantoni, now with the University of Waterloo, Waterloo, Canada; and Alexander N. Korotkov, with the University of California, Riverside.

Gail Gallessich | EurekAlert!
Further information:
http://www.ucsb.edu

More articles from Physics and Astronomy:

nachricht Magnetic nano-imaging on a table top
20.04.2018 | Georg-August-Universität Göttingen

nachricht New record on squeezing light to one atom: Atomic Lego guides light below one nanometer
20.04.2018 | ICFO-The Institute of Photonic Sciences

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Spider silk key to new bone-fixing composite

University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.

Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

Im Focus: Basel researchers succeed in cultivating cartilage from stem cells

Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.

Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...

Im Focus: Like a wedge in a hinge

Researchers lay groundwork to tailor drugs for new targets in cancer therapy

In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

Magnetic nano-imaging on a table top

20.04.2018 | Physics and Astronomy

Start of work for the world's largest electric truck

20.04.2018 | Interdisciplinary Research

Atoms may hum a tune from grand cosmic symphony

20.04.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>