Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > A new twist for quantum systems

Macroscopic quantum objects: A microwave resonator measuring 32 mm x 15 mm x 5 mm (left) contains superconducting circuits (center and right) that display similar quantum behavior as atoms.

Credit: Abdufarrukh Abdumalikov / ETH Zurich
Macroscopic quantum objects: A microwave resonator measuring 32 mm x 15 mm x 5 mm (left) contains superconducting circuits (center and right) that display similar quantum behavior as atoms.

Credit: Abdufarrukh Abdumalikov / ETH Zurich

Abstract:
To maneuver a car into a parking spot parallel to the road can be quite a challenge. It would be an easy task, of course, if only the vehicle could move sideways. As this is not possible, the sideways motion must be pieced together - sometimes elegantly, sometimes less so - in a series of forward and backward movements and turns on the steering wheel. Such a finely tuned sequence of movements also enables cats to almost always land on their feet after a free fall. Researchers at ETH Zurich have now used a similar principle for steering a quantum system into a desired state. This new type of control should be useful in situations in which quantum systems must be precisely controlled, not least in the context of quantum computers.

A new twist for quantum systems

Zurich, Switzerland | Posted on April 17th, 2013

Big quantum world

For their research, scientists in the group of Andreas Wallraff, a professor at the Department of Physics, use "artificial atoms" made of electronic circuits, which they control with microwave pulses. These circuits comprise superconducting components - that is, components in which electric currents can flow without resistance—and typically measure fractions of a millimeter. "For a quantum physicist, these circuits are enormously large objects, but they display behavior that is very similar to that of atoms," explains Wallraff.

Unlike in natural quantum systems, such as atoms, electrons or photons, the design and properties of the quantum circuits can be changed and adapted to different applications. Moreover, the fragile quantum states can survive for several microseconds in these superconducting circuits - a relatively long time for quantum objects. During this time the state can be manipulated with microwave pulses, in order to study the quantum state itself or to make use of it in a quantum computation.

Finding the right twist

These favorable properties notwithstanding, the quantum circuits are highly sensitive to external disturbances (caused, for example, by imperfect shielding), just as natural quantum systems. Under the direction of Stefan Filipp, a scientist in the Wallraff group, the ETH Zurich researchers have now found a possible way to render the quantum states more robust against disturbances. They make use of the geometry of so-called Hilbert spaces; these abstract spaces are the 'natural habitat' of any quantum system. Similarly as a car is driven through a two-dimensional space, a quantum system is steered through its Hilbert space.

Both for parallel parking and for controlling quantum systems, the specific sequence of operations is important. For example, when a motorist first performs all steering-wheel movements and then all forward and backward movements, then she or he will hardly end up in the parking spot. The situation is comparable for the physicists' artificial atoms, which they control with microwave pulses. "We obtain different results depending on the order in which we apply the individual pulses, even if the pulses have an identical shape, the same energy and the same length. This can only be explained by the different routes the system takes through its Hilbert space," says Stefan Filipp.

Path towards a quantum computer

"This is the first time that somebody obtained this specific type of control over an isolated quantum object and was able to study the process in detail," adds Abdufarrukh Abdumalikov, scientist in the Wallraff group. An important factor for the ETH physicists' success was that they could work with relatively short microwave pulses. "This allowed us to perform operations quickly, before the quantum state was irrevocably destroyed," says Abdumalikov.

The researchers expect that their method may provide a viable path towards a practical quantum computer. The development of such devices, which use the laws of quantum mechanics to tackle computational tasks, is a very active field of current study. Quantum physics opens up a whole range of new possibilities for information processing, and one day quantum computers may help solve problems that are computationally too complex for any conventional computer to solve within reasonable time.

####

For more information, please click here

Contacts:
Dr. Abdufarrukh Abdumalikov

41-446-337-124

Copyright © ETH Zurich

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Ultrathin, flat lens resolves chirality and color: Multifunctional lens could replace bulky, expensive machines June 25th, 2016

Nanotechnology and math deliver two-in-one punch for cancer therapy resistance June 24th, 2016

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

Particle zoo in a quantum computer: First experimental quantum simulation of particle physics phenomena June 23rd, 2016

Superconductivity

Coexistence of superconductivity and charge density waves observed June 23rd, 2016

Titan shines light on high-temperature superconductor pathway: Simulation demonstrates how superconductivity arises in cuprates' pseudogap phase June 22nd, 2016

Marrying superconductors, lasers, and Bose-Einstein condensates: Chapman University Institute for Quantum Studies (IQS) member Yutaka Shikano, Ph.D., recently had research published in Scientific Reports June 20th, 2016

Physics

Particle zoo in a quantum computer: First experimental quantum simulation of particle physics phenomena June 23rd, 2016

Laboratories

Titan shines light on high-temperature superconductor pathway: Simulation demonstrates how superconductivity arises in cuprates' pseudogap phase June 22nd, 2016

Discovery of gold nanocluster 'double' hints at other shape-changing particles: New analysis approach brings two unique atomic structures into focus June 19th, 2016

Quantum Computing

Particle zoo in a quantum computer: First experimental quantum simulation of particle physics phenomena June 23rd, 2016

CWRU physicists deploy magnetic vortex to control electron spin: Potential technology for quantum computing, keener sensors June 21st, 2016

Researchers refine method for detecting quantum entanglement June 18th, 2016

UChicago physicists first to see behavior of quantum materials in curved space: Feat probes light-matter interplay, phenomena of potential technological interest June 16th, 2016

Discoveries

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Ultrathin, flat lens resolves chirality and color: Multifunctional lens could replace bulky, expensive machines June 25th, 2016

Nanotechnology and math deliver two-in-one punch for cancer therapy resistance June 24th, 2016

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

Announcements

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Ultrathin, flat lens resolves chirality and color: Multifunctional lens could replace bulky, expensive machines June 25th, 2016

Nanotechnology and math deliver two-in-one punch for cancer therapy resistance June 24th, 2016

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic