Nanotechnology Now





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

TCL Unveils First 65” TV Featuring QD Vision’s Color IQ™ Quantum Dot Technology: Emerging industry leader introduces expanded quantum dot TV lineup May 30th, 2015

Nanotech Secures Additional Patents in Advanced Security Features: New patented features gain attention from the banknote industry May 30th, 2015

New 'designer carbon' from Stanford boosts battery performance May 30th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

Physics

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

How spacetime is built by quantum entanglement: New insight into unification of general relativity and quantum mechanics May 28th, 2015

Squeezed quantum cats May 28th, 2015

Superconductivity

Linking superconductivity and structure May 28th, 2015

Laboratories

Linking superconductivity and structure May 28th, 2015

Collaboration could lead to biodegradable computer chips May 28th, 2015

Quantum Computing

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

Squeezed quantum cats May 28th, 2015

Advance in quantum error correction: Protocol corrects virtually all errors in quantum memory, but requires little measure of quantum states May 27th, 2015

Researchers discover 'swing-dancing' pairs of electrons: Findings set the stage for room-temperature superconductivity and the transformation of high-speed rail, quantum computers May 14th, 2015

Discoveries

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

New chip makes testing for antibiotic-resistant bacteria faster, easier: Researchers at the University of Toronto design diagnostic chip to reduce testing time from days to one hour, allowing doctors to pick the right antibiotic the first time May 28th, 2015

Announcements

TCL Unveils First 65” TV Featuring QD Vision’s Color IQ™ Quantum Dot Technology: Emerging industry leader introduces expanded quantum dot TV lineup May 30th, 2015

Nanotech Secures Additional Patents in Advanced Security Features: New patented features gain attention from the banknote industry May 30th, 2015

New 'designer carbon' from Stanford boosts battery performance May 30th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

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