Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Classical mechanics helps control quantum computers: Into the quantum world with a tennis racket

06.07.2017

Quantum technology is seen as an important future-oriented technology: smaller, faster and with higher performance than conventional electronics. However, exploiting quantum effects is difficult because nature’s smallest building blocks have properties quite distinct from those we know from our everyday world. An international team of researchers has now succeeded in extracting a fault tolerant manipulation of quanta from an effect of classical mechanics.

The motion of a tennis racket in the air can help predict the behavior of quanta. “Using an analogy from classical physics aids us in more efficiently designing and illustrating control elements for phenomena in the quantum world,” reports Stefan Glaser, professor in the Department of Chemistry at the Technical University of Munich (TUM).


While the racket rotates 360 degrees about its lateral axis, the tennis racket effect leads to an unintentional 180-degree flip about its longitudinal axis.

Credit: Steffen Glaser / TUM

“Controlling the properties of quanta and using them in technical processes has proven difficult thus far because the quanta adhere to their own laws, which often exceed our imagination,” explains the scientist. “Possible applications such as secure networks, highly sensitive measuring equipment and ultrafast quantum computers are thus still in their infancy.”

Quanta under control

“Utilizing quantum effects in a technical manner by influencing the behavior of particles through electromagnetic fields required the fastest possible methods to develop fault-tolerant control sequences,” says Glaser. “To date, most of the methods build on very complicated computational processes.”

Together with an international team of physicists, chemists and mathematicians, the researcher has now discovered an unexpected, promising and novel approach: Using the tennis racket effect, a well-known phenomenon in classical mechanics, the consistent alteration in the spin of quanta via electromagnetic control commands can be visualized.

Tennis racket in motion

The tennis racket effect describes what happens when one tosses a tennis racket into the air while imparting a rotation about an axis. When one spins the racket about its transverse axis a surprising effect appears: In addition to the intended 360-degree rotation about its transverse axis, the racket will almost always perform an unexpected 180-degree flip about its longitudinal axis. When the racket is caught, the initial bottom side will be facing up.

“Responsible for this effect are tiny deviations and perturbations during the toss and the different moments of inertia along the three axes of an asymmetrical body. The effect can also be observed by tossing a book or cell phone into the air – for good measure over a soft bedding – instead of a tennis racket,” elucidates Glaser. The longest and shortest axes are stable. However, the intermediate axis, in the case of a tennis racket, the transverse axis, is unstable and even miniscule agitations reliably trigger an additional 180-degree rotation.

Quanta in motion

Quanta also possess angular momentum, known as spin. This can be influenced by applying an electromagnetic field. “The aim of this quantum technique is to change the orientation of the spin in a targeted manner, thereby minimizing errors caused by small perturbations,” says Glaser.

“The discovered mathematical analogy between the geometric properties of classical physics pertaining to freely rotating objects and controlling quantum phenomena can now be utilized to optimize the electromagnetic control of quantum states,” summarizes co-author Prof. Dominique Sugny. The scientist works at the French University of Burgundy, as well as a Hans Fischer Fellow at the Institute for Advanced Study at TUM.

New, robust models

Using measurements of the nuclear spin, the team could demonstrate experimentally that the tennis racket effect really does improve the robustness of scattering sequences. They have now published their results in the journal “Scientific Reports.”

“Based on these research results, we can now develop more efficient mathematical models that allow errors to be avoided when controlling quantum processors,” adds Glaser. “Building on the well-understood phenomenon from classical physics, we can not only visualize the development of reliable control sequences in quantum technology, but also accelerate them significantly.”

---

The research was funded by the German Research Foundation (DFG), the French National Research Agency (ANR) and the French National Center of Scientific Research (CNRS), the Mexican funding program Convocatorias Abiertas Fondo de Cooperación Internacional en Ciencia y Tecnología del Conacyt (FONCICYT), the Autonomous National University of Mexico, the Bavarian Elite Network and the Technical University of Munich via the Institute for Advanced Study funded by the German Excellence Initiative and the European Union. The experiments were conducted at the Bavarian NMR Center in Garching.

Image:

https://mediatum.ub.tum.de/1368067

Further information:

Breaking Newton’s law
https://www.tum.de/en/about-tum/news/press-releases/detail/article/33954/

Visualization of the matrix
https://www.tum.de/en/about-tum/news/press-releases/detail/article/32429/

Contact:

Prof. Dr. Steffen Glaser
Technical University of Munich
Chair of Organic Chemistry
Lichtenbergstr.4, 85748 Garching, Germany
Tel.: +49 89 289 52602 – E-Mail: glaser@tum.de – Web: http://www.ocnmr.ch.tum.de/

Prof. Dr. Dominique Sugny
Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB)
UMR 5209 CNRS-Université Bourgogne Franche Comté
9 Av. A. Savary, BP 47 870, F-21078, Dijon Cedex, France
Tel.: +33 380 395972 – E-Mail: Dominique.Sugny@u-bourgogne.fr

Weitere Informationen:

https://www.tum.de/en/about-tum/news/press-releases/detail/article/34054/ Link to the Press release

Dr. Ulrich Marsch | Technische Universität München

More articles from Physics and Astronomy:

nachricht Supercomputers without waste heat
07.12.2018 | Universität Konstanz

nachricht DF-PGT, now possible through massive sequencing techniques
06.12.2018 | Universitat Autonoma de Barcelona

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

Im Focus: Substitute for rare earth metal oxides

New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals

Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.

Im Focus: A bit of a stretch... material that thickens as it's pulled

Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.

Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...

Im Focus: The force of the vacuum

Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.

The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

Expert Panel on the Future of HPC in Engineering

03.12.2018 | Event News

Inaugural "Virtual World Tour" scheduled for december

28.11.2018 | Event News

 
Latest News

A new molecular player involved in T cell activation

07.12.2018 | Life Sciences

High-temperature electronics? That's hot

07.12.2018 | Materials Sciences

Supercomputers without waste heat

07.12.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>