Featured Research

from universities, journals, and other organizations

Quantum computing? Progress in the fight against quantum dissipation

Date:
April 16, 2014
Source:
Yale University
Summary:
Scientists have confirmed a 50-year-old, previously untested theoretical prediction in physics and improved the energy storage time of a quantum switch by several orders of magnitude. High-quality quantum switches are essential for the development of quantum computers and the quantum internet -- innovations that would offer vastly greater information processing power and speed than classical (digital) computers, as well as more secure information transmission.

Scientists at Yale have confirmed a 50-year-old, previously untested theoretical prediction in physics and improved the energy storage time of a quantum switch by several orders of magnitude.
Credit: Image courtesy of Yale University

Scientists at Yale have confirmed a 50-year-old, previously untested theoretical prediction in physics and improved the energy storage time of a quantum switch by several orders of magnitude. They report their results in the April 17 issue of the journal Nature.

High-quality quantum switches are essential for the development of quantum computers and the quantum internet -- innovations that would offer vastly greater information processing power and speed than classical (digital) computers, as well as more secure information transmission.

"Fighting dissipation is one of the main goals in the development of quantum hardware," said Ioan Pop, a postdoctoral researcher in applied physics at Yale and lead author of the paper. "A quantum switch needs to act reversibly without losing any energy. Our result is very encouraging for the development of superconducting quantum bits acting as switches."

Superconducting quantum bits, or qubits, are artificial atoms that represent information in quantum systems. They also manipulate that information as they switch among states -- such as "0," "1," or both simultaneously -- under the influence of other qubits. But in switching states, they tend to lose energy, resulting in information loss.

In the Yale experiment, researchers demonstrated that a type of superconducting quantum bit can be immune to dissipation in presence of a quasiparticle -- a microscopic entity that normally saps the energy of the qubit.

"We can engineer a system that is immune to quasiparticle dissipation," Pop said.

The researchers used an artificial fluxonium atom as their qubit.

The experiment confirms by direct measurement a theoretical prediction made by Nobel Prize-winning British physicist Brian Josephson in the 1960s, namely that quasiparticle dissipation should vanish under certain conditions. Josephson junctions are superconducting devices with properties well suited for building quantum processing systems.

The results open new frontiers in areas related to quantum information and quantum measurements, the researchers said, providing both a strategy for building dissipation-immune quantum systems and a specific new device that could be adapted for better measuring properties of quasiparticles and understanding their origin and dynamics.


Story Source:

The above story is based on materials provided by Yale University. The original article was written by Eric Gershon. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ioan M. Pop, Kurtis Geerlings, Gianluigi Catelani, Robert J. Schoelkopf, Leonid I. Glazman, Michel H. Devoret. Coherent suppression of electromagnetic dissipation due to superconducting quasiparticles. Nature, 2014; 508 (7496): 369 DOI: 10.1038/nature13017

Cite This Page:

Yale University. "Quantum computing? Progress in the fight against quantum dissipation." ScienceDaily. ScienceDaily, 16 April 2014. <www.sciencedaily.com/releases/2014/04/140416133412.htm>.
Yale University. (2014, April 16). Quantum computing? Progress in the fight against quantum dissipation. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2014/04/140416133412.htm
Yale University. "Quantum computing? Progress in the fight against quantum dissipation." ScienceDaily. www.sciencedaily.com/releases/2014/04/140416133412.htm (accessed July 24, 2014).

Share This




More Computers & Math News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com
Facebook Earnings Put Smile on Investors Faces

Facebook Earnings Put Smile on Investors Faces

Reuters - Business Video Online (July 23, 2014) Facebook earnings beat forecasts- with revenue climbing 61 percent. Bobbi Rebell reports. Video provided by Reuters
Powered by NewsLook.com
StubHub Caught in Global Cyber Crime Ring

StubHub Caught in Global Cyber Crime Ring

Reuters - Business Video Online (July 23, 2014) eBay's StubHub is caught up in an international cyber crime ring stretching from North America to Europe. Conway G. Gittens reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins