Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Artificial atoms light up

10.05.2010
A superconducting circuit that strongly interacts with light paves the way for optical computing schemes

Before a quantum effect such as resonance fluorescence—resulting from the interaction of light with atoms—can be applied to quantum computing schemes, scientists need to replicate it in the laboratory.

Thus far, however, efforts using artificial atoms made from superconducting circuits have been unsuccessful. Now, resonance fluorescence of a single artificial atom has been demonstrated by researchers from the NEC Nano Electronics Laboratory in Tsukuba and the RIKEN Advanced Science Institute in Wako.

Resonance fluorescence occurs when a light beam with an energy that matches an atom’s resonance energy gets absorbed by the atom and then re-emitted in random directions. As resonance fluorescence can be used to couple two photons, or light particles, scientists are keen to exploit this effect in quantum computing operations. However, this effect in atoms is too small to be useful for practical applications since photons and atoms interact very weakly due to their small size, according to Jaw-Shen Tsai, who led the research team.

To circumvent this problem, researchers created artificial atoms on computer chips, where the interaction between light and the artificial atom can be optimized. “With a solid-state device such as ours, made from superconducting circuits, the coupling can be very strong,” says Tsai.

Earlier attempts by researchers in the field to observe resonant fluorescence in artificial atoms resulted in low efficiencies of around 12%, owing to poor re-emission of the absorbed light by these atoms. To enhance the re-emission process, the researchers used a one-dimensional waveguide coupled to the artificial atom. This resulted in an efficient re-emission of light from the artificial atom because in the waveguide the light is channelled in only two directions. Tsai and colleagues demonstrated that about 94% of the incoming light at the resonance frequency of the superconducting circuit was absorbed and re-emitted.

By building on this strong interaction between incoming light and the artificial atom a number of potential applications are now possible, according to Tsai. “There are a whole series of experiments one can do, for example towards photon-based quantum computing,” he says. The absorption of a photon by an artificial atom, for example, could be used to control the propagation of a second photon along the waveguide, owing to the non-linear nature of the interaction of light with the artificial atom, Tsai explains.

This research is funded by the Japanese government through a Kakenhi Grant-in-Aid for Scientific Research on Quantum Cybernetics.

The corresponding author for this highlight is based at the Macroscopic Quantum Coherence Team, RIKEN Advanced Science Institute

Journal information

1. Astafiev, O., Zagoskin, A.M., Abdumalikov, A.A., Pashkin, Yu.A., Yamamoto, T., Inomata, K., Nakamura, Y. & Tsai, J.S. Resonance fluorescence of a single artificial atom. Science 327, 840–843 (2010)

gro-pr | Research asia research news
Further information:
http://www.rikenresearch.riken.jp/eng/research/6255
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht From rocks in Colorado, evidence of a 'chaotic solar system'
23.02.2017 | University of Wisconsin-Madison

nachricht Prediction: More gas-giants will be found orbiting Sun-like stars
22.02.2017 | Carnegie Institution for Science

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: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

NASA eyes Pineapple Express soaking California

24.02.2017 | Earth Sciences

New gene for atrazine resistance identified in waterhemp

24.02.2017 | Agricultural and Forestry Science

New Mechanisms of Gene Inactivation may prevent Aging and Cancer

24.02.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>