Bristol UK (SPX) Mar 04, 2011
A research group led by scientists from the University of Bristol has demonstrated the quantum operation of new components that will enable compact circuits for future photonic quantum computers.
Quantum computers, holding the great promise of tremendous computational power for particular tasks, have been the goal of worldwide efforts by scientists for several years. Tremendous advances have been made but there is still a long way to go.
Building a quantum computer will require a large number of interconnected components - gates - which work in a similar way to the microprocessors in current personal computers. Currently, most quantum gates are large structures and the bulky nature of these devices prevents scalability to the large and complex circuits required for practical applications.
Recently, the researchers from the University of Bristol's Centre for Quantum Photonics showed, in several important breakthroughs, that quantum information can be manipulated with integrated photonic circuits. Such circuits are compact (enabling scalability) and stable (with low noise) and could lead in the near future to mass production of chips for quantum computers.
Now the team, in collaboration with Dr Terry Rudolph at Imperial College, London, shows a new class of integrated divides that promise further reduction in the number of components that will be used for building future quantum circuits.
These devices, based on optical multimode interference (and therefore often called MMIs) have been widely employed in classical optics as they are compact and very robust to fabrication tolerances. "While building a complex quantum network requires a large number of basic components, MMIs can often enable the implementation with much fewer resources," said Alberto Peruzzo, PhD student working on the experiment.
Until now it was not clear how these devices would work in the quantum regime. Bristol researchers have demonstrated that MMIs can perform quantum interference at the high fidelity required.
Scientists will now be able to implement more compact photonics circuits for quantum computing. MMIs can generate large entangled states, at the heart of the exponential speedup promised by quantum computing.
"Applications will range from new circuits for quantum computation to ultra precise measurement and secure quantum communication," said Professor Jeremy O'Brien, director of the Centre for Quantum Photonics.
The team now plans to build new sophisticated circuits for quantum computation and quantum metrology using MMI devices.
The research will be published online in the next issue of Nature Communications (Tuesday 1 March). The open-access paper can be downloaded here.
Share This Article With Planet Earth
University of Bristol
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com
New MIT Developments In Quantum Computing
Cambridge, MA (SPX) Mar 04, 2011
Quantum computers are computers that exploit the weird properties of matter at extremely small scales. Many experts believe that a full-blown quantum computer could perform calculations that would be hopelessly time consuming on classical computers, but so far, quantum computers have proven hard to build. At the Association for Computing Machinery's 43rd Symposium on Theory of Computing in ... read more
Gadgets ruining people's sleep: study|
Japan's Hitachi to sell HDD unit to Western Digital
Silk protein boosts e-book efficiency: scientists
Skype to introduce ads
LockMart Wins Role On Navy C4ISR Services Contract
ONR Moves A Modular Space Communications Asset Into Unmanned Aircraft For Marines
Northrop Grumman Next-Gen FBCB2 System Approved For Fielding
Boeing To Demonstrate Aviation Command And Control Subsystem For US Marine Corps
Russia Lacks Enough Carrier Rockets To Fulfill 2011 Launch Plans
NASA Assessing New Launch Dates For The Glory Mission
Successful Launch Of REXUS 9
24 hour delay for launch of NASA satellite
Shark Tracking Reveals Impressive Feats Of Navigation
China To Establish Global Satellite Navigation System By 2020
EGNOS Navigation System Begins Serving Europe's Aircraft
Beijing to trial mobile tracking system: report
EADS will not protest Boeing tanker contract
Chinese plane maker buys US Cirrus
US "air capital" savors Boeing tanker victory
China to spend $230 bn on aviation sector
New Generation Of Optical Integrated Devices For Future Quantum Computers
JQI Physicists Demonstrate Coveted Spin-Orbit Coupling In Atomic Gases
New MIT Developments In Quantum Computing
Development Team Achieves One Terabit per Second Data Rate On Single Integrated Photonic Chip
NASA reels from climate science setbacks
New Day Dawns For Satellite To Study Earth's Ozone Layer
NASA to launch Earth observation satellite Friday
Good Progress On Troubleshooting
Philippines disposes of Cold War-era US bombs
Death sentences for Indian train burners
Pollution a threat to China's growth
Russia jails four environmentalists after protest
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. 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 SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement|