by Staff Writers
Innsbruck, Austria (SPX) May 31, 2011
A general rule in data processing is that disturbances cause the distortion or deletion of information during data storage or transfer. Methods for conventional computers were developed that automatically identify and correct errors: Data are processed several times and if errors occur, the most likely correct option is chosen.
As quantum systems are even more sensitive to environmental disturbances than classical systems, a quantum computer requires a highly efficient algorithm for error correction.
The research group of Rainer Blatt from the Institute for Experimental Physics of the University of Innsbruck and the Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences (IQOQI) has now demonstrated such an algorithm experimentally.
"The difficulty arises because quantum information cannot be copied," explains Schindler. "This means that we cannot save information repeatedly and then compare it."
Therefore, the physicists use one of the peculiarities of quantum physics and use quantum mechanical entanglement to perform error correction.
Quick and efficient error correction
"Then a quantum algorithm determines whether an error occurs and if so, which one. Subsequently, the algorithm itself corrects the error." After having made the correction, the auxiliary qubits are reset using a laser beam. "This last point is the new element in our experiment, which enables repetitive error correction," says Rainer Blatt.
"Some years ago, American colleagues demonstrated the general functioning of quantum error correction. Our new mechanism allows us to repeatedly and efficiently correct errors."
Leading the field
For many years Rainer Blatt's research group, which is one of the global leaders in the field, has been working on realizing a quantum computer.
Three years ago they presented the first quantum gate with fidelity of more than 99 percent. Now they have realized another key element: repetitive error correction.
Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.
New Bandwidth Management Techniques Boost Operating Efficiency In Multi-Core Chips
Raleigh, NC (SPX) May 27, 2011
Researchers from North Carolina State University have developed two new techniques to help maximize the performance of multi-core computer chips by allowing them to retrieve data more efficiently, which boosts chip performance by 10 to 40 percent. To do this, the new techniques allow multi-core chips to deal with two things more efficiently: allocating bandwidth and "prefetching" data. Mul ... read more
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2011 - Space Media Network. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|