Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Coincidence helps with quantum measurements: New method enables quantum simulations on larger systems

The repeated measurement of randomly selected transformations of individual particles reveals provides information about the degree of entanglement of a system.

CREDIT
IQOQI Innsbruck/M.R.Knabl
The repeated measurement of randomly selected transformations of individual particles reveals provides information about the degree of entanglement of a system. CREDIT IQOQI Innsbruck/M.R.Knabl

Abstract:
Quantum phenomena are experimentally difficult to deal with, the effort increases dramatically with the size of the system. For some years now, scientists are capable of controlling small quantum systems and investigating quantum properties. Such quantum simulations are considered promising early applications of quantum technologies that could solve problems where simulations on conventional computers fail. However, the quantum systems used as quantum simulators must continue to grow. The entanglement of many particles is still a phenomenon that is difficult to understand. "In order to operate a quantum simulator consisting of ten or more particles in the laboratory, we must characterize the states of the system as accurately as possible," explains Christian Roos from the Institute of Quantum Optics and Quantum Information at the Austrian Academy of Sciences.

Coincidence helps with quantum measurements: New method enables quantum simulations on larger systems

Innsbruck, Austria | Posted on April 22nd, 2019

So far, quantum state tomography has been used for the characterization of quantum states, with which the system can be completely described. This method, however, involves a very high measuring and computing effort and is not suitable for systems with more than half a dozen particles. Two years ago, the researchers led by Christian Roos, together with colleagues from Germany and Great Britain, presented a very efficient method for the characterization of complex quantum states. However, only weakly entangled states can be described with this method. This issue is now circumvented by a new method presented last year by the theorists led by Peter Zoller, which can be used to characterize any entangled state. Together with experimental physicists Rainer Blatt and Christian Roos and their team, they have now demonstrated this method in the laboratory.

Quantum simulations on larger systems

"The new method is based on the repeated measurement of randomly selected transformations of individual particles. The statistical evaluation of the measurement results then provides information about the degree of entanglement of the system," explains Andreas Elben from Peter Zoller's team. The Austrian physicists demonstrated the process in a quantum simulator consisting of several ions arranged in a row in a vacuum chamber. Starting from a simple state, the researchers let the individual particles interact with the help of laser pulses and thus generate entanglement in the system. "We perform 500 local transformations on each ion and repeat the measurements a total of 150 times in order to then be able to use statistical methods to determine information about the entanglement state from the measurement results," explains PhD student Tiff Brydges from the Institute of Quantum Optics and Quantum Information.

In the work now published in Science, the Innsbruck physicists characterize the dynamic development of a system consisting of ten ions as well as a subsystem consisting of ten ions of a 20-ion chain. "In the laboratory, this new method helps us a lot because it enables us to understand our quantum simulator even better and, for example, to assess the purity of the entanglement more precisely," says Christian Roos, who assumes that the new method can be successfully applied to quantum systems with up to several dozen particles.

The scientific work was published in the journal Science and financially supported by the European Research Council ERC and the Austrian Science Fund FWF. "This publication shows once again the fruitful cooperation between the theoretical physicists and the experimental physicists here in Innsbruck", emphasizes Peter Zoller. "At the University of Innsbruck and the Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, young researchers from both fields find very good conditions for research work that is competitive worldwide."

####

For more information, please click here

Contacts:
Christian Roos

43-512-507-4728

Copyright © University of Innsbruck

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 Links

RELATED JOURNAL ARTICLE:

Related News Press

News and information

MTU engineers examine lithium battery defects January 28th, 2020

Extraction of lithium from its largest source, i.e. seawater, by nanostructured membranes January 27th, 2020

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

What if the Universe has no end? The Big Bang is widely accepted as being the beginning of everything we see around us, but other theories that are gathering support among scientists are suggesting otherwise January 25th, 2020

Quantum Physics

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

Quantum physics: On the way to quantum networks January 24th, 2020

Govt.-Legislation/Regulation/Funding/Policy

MTU engineers examine lithium battery defects January 28th, 2020

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

Nano-thin flexible touchscreens could be printed like newspaper: New touch-responsive technology is 100 times thinner than existing touchscreen materials and so pliable it can be rolled up like a tube January 24th, 2020

Toward safer disposal of printed circuit boards January 16th, 2020

Possible Futures

MTU engineers examine lithium battery defects January 28th, 2020

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

What if the Universe has no end? The Big Bang is widely accepted as being the beginning of everything we see around us, but other theories that are gathering support among scientists are suggesting otherwise January 25th, 2020

Nano-thin flexible touchscreens could be printed like newspaper: New touch-responsive technology is 100 times thinner than existing touchscreen materials and so pliable it can be rolled up like a tube January 24th, 2020

Quantum Computing

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

ORNL researchers advance performance benchmark for quantum computers January 3rd, 2020

In leap for quantum computing, silicon quantum bits establish a long-distance relationship: Princeton scientists demonstrate that two silicon quantum bits can communicate across relatively long distances in a turning point for the technology December 27th, 2019

A distinct spin on atomic transport: Work that demonstrates simultaneous control over transport and spin properties of cold atoms establishes a framework for exploring concepts of spintronics and solid-state physics November 8th, 2019

Discoveries

Extraction of lithium from its largest source, i.e. seawater, by nanostructured membranes January 27th, 2020

Quantum physics: On the way to quantum networks January 24th, 2020

Nano-thin flexible touchscreens could be printed like newspaper: New touch-responsive technology is 100 times thinner than existing touchscreen materials and so pliable it can be rolled up like a tube January 24th, 2020

Old Molecule, New Tricks: Chemistry professors develop an electrochemical method for extracting uranium, and potentially other metal ions, from solution January 24th, 2020

Announcements

MTU engineers examine lithium battery defects January 28th, 2020

Extraction of lithium from its largest source, i.e. seawater, by nanostructured membranes January 27th, 2020

SUNY Poly Professor Partners with Leading Institutions on NSF Award for Quantum Information Science Research: SUNY Poly Research Builds Upon Recent Quantum-related Research Initiatives and Workshops January 27th, 2020

American Chemical Society names Philip Proteau as new editor-in-chief of the Journal of Natural Products January 24th, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

MTU engineers examine lithium battery defects January 28th, 2020

Extraction of lithium from its largest source, i.e. seawater, by nanostructured membranes January 27th, 2020

What if the Universe has no end? The Big Bang is widely accepted as being the beginning of everything we see around us, but other theories that are gathering support among scientists are suggesting otherwise January 25th, 2020

A consensus statement establishes the protocols to study stability of perovskite photovoltaic devices January 24th, 2020

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project