Navigation Links
Quantum control protocols could lead to more accurate, larger scale quantum computations
Date:4/4/2012

(Santa Barbara, Calif.) A protocol for controlling quantum information pioneered by researchers at UC Santa Barbara, the Kavli Institute of Nanoscience in Delft, the Netherlands, and the Ames Laboratory at Iowa State University could open the door to larger-scale, more accurate quantum computations. Their findings, in a paper titled "Decoherence-protected quantum gates for a hybrid solid-state spin register," are published in the current issue of the journal Nature.

"Although interactions between a quantum bit ('qubit') and its environment tend to corrupt the information it stores, it is possible to dynamically control qubits in a way that facilitates the execution of quantum information-processing algorithms while simultaneously protecting the qubits from environment-induced errors," said UCSB physicist David Awschalom. He and his group were responsible for developing the electron and nuclear spins used as the quantum bits the quantum version of the computer bit in their demonstration and for helping to analyze the results.

Awschalom is director of UCSB's Center for Spintronics & Quantum Computation, professor of physics, electrical and computer engineering, and the Peter J. Clarke Director of the California NanoSystems Institute.

Dynamical protection of quantum information is essential for quantum computing as the qubits used for information processing and storage are highly susceptible to errors induced by interactions with atoms in the qubits' environment. The scientists' previous research has shown that quantum information stored in qubits can be effectively protected through successive control operations (rotations) on a qubit that filter out these unwanted interactions. However, these control operations also filter out the interactions between qubits that are essential for the realization of logic gates for quantum information processing. Thus, until recently, quantum information stored in protected qubit states could not be used for quantum computations.

The research team, which also included members from the University of Southern California, showed that by precisely synchronizing the rotations of an electron spin with the rotation of a nearby nuclear spin, they could realize dynamical protection of both qubits from the environment while maintaining the interactions between the two spins that are necessary for quantum information processing. As a proof of principle, the researchers demonstrated the high-fidelity execution of a quantum search algorithm using this two-qubit system. Quantum search algorithms, if executed on a larger number of qubits, could provide search results of certain databases considerably faster than search algorithms performed on a classical computer.

The results of this study point to greater possibilities for quantum computers that overcome, according to Awschalom, the perception that spin qubits in semiconductors, such as those used in this work, suffer from too strong of environmental interactions to be useful qubits. These solid state spin systems also offer the added benefit of operating at room temperature, in contrast to other candidate qubit systems which operate at only at a fraction of a degree above absolute zero.

"This demonstration of performing a quantum algorithm at the subatomic level with single spins suggests a pathway to build increasingly complex quantum machines, using qubit control protocols that circumvent the expected limitations from real materials," said Awschalom.


'/>"/>

Contact: Sonia Fernandez
sonia.fernandez@ia.ucsb.edu
805-893-4765
University of California - Santa Barbara
Source:Eurekalert  

Related biology technology :

1. Single molecules in a quantum movie
2. A new class of electron interactions in quantum systems
3. Graphene quantum dots: The next big small thing
4. Smaller and more powerful electronics requires the understanding of quantum jamming physics
5. Quantum computing has applications in magnetic imaging, say Pitt researchers
6. Michael Cusumano, MITs Sloan Distinguished Professor of Management, Joins Quantum Leap Innovations Board of Directors
7. Pitt discoveries in quantum physics could change face of technology
8. In new quantum-dot LED design, researchers turn troublesome molecules to their advantage
9. UCSB physicists identify room temperature quantum bits in widely used semiconductor
10. New hybrid technology could bring quantum information systems
11. Three for the price of one - mobile electrons multiplied in quantum dot films
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Quantum control protocols could lead to more accurate, larger scale quantum computations
(Date:3/22/2017)... ... 22, 2017 , ... Researchers face a fundamental challenge as ... full-size tissues, bones, even whole organs to implant in people to treat disease ... into the developing tissue. , Current bioengineering techniques, including 3-D printing, can’t ...
(Date:3/22/2017)... CAMBRIDGE, Mass. , March 22, 2017 ... announced that it has eclipsed the 130 million covered ... Cross Blue Shield of Texas . ... stages, the Company continues to enjoy strong payor acceptance ... of its clinical programs and genetic counseling, its industry-leading ...
(Date:3/22/2017)... 22, 2017 The global chronic ... research report by Transparency Market Research (TMR). The top ... and AbbVie Inc., accounted for a share of only ... in this market are focusing aggressively on mergers, acquisitions, ... is likely to lead to market consolidation in the ...
(Date:3/22/2017)... Mass. , March 22, 2017   Boston ... next-generation cancer therapeutics designed to target cancer stemness pathways, ... Patricia S. Andrews as Chief Executive Officer, effective ... succeed Chiang J. Li , M.D., FACP, who ... ten years ago. Under his leadership, Boston Biomedical has ...
Breaking Biology Technology:
(Date:3/6/2017)... SAN MATEO, Calif. , March 6, 2017 ... predictive marketing and sales technology, today announced Predictive ... (AI) solution for infusing actionable sales intelligence into ... customers to automatically enable their sales organizations with ... contextual messages that allow for intelligent engagement. Predictive ...
(Date:3/2/2017)... -- Australian stem cell and regenerative medicine company, ... agreement with the Monash Lung Biology Network, a consortia ... Department of Pharmacology at Monash University, Melbourne ... support the use of Cymerus™ mesenchymal stem cells (MSCs) ... is a chronic, long term lung condition recognised by ...
(Date:2/28/2017)... 27. Februar 2017  EyeLock LLC, ein marktführendes Unternehmen ... erstklassige biometrische Lösung zur Iris-Erkennung auf der ... LTE auf dem Mobile World Congress 2017 ... in Halle 3, Stand 3E10, vorstellen. ... Qualcomm Haven™ – eine Kombination aus Hardware, ...
Breaking Biology News(10 mins):