Quasiparticles can be used to explain physical phenomena in solid bodies even though they are not actual physical particles.
Physicists in Innsbruck have now realized quasiparticles in a quantum system and observed quantum mechanical entanglement propagation in a many-body system. The researchers have published their work in Nature.
Christian Roos’ research team at the Institute for Quantum Optics and Quantum Information at the Austrian Academy of Sciences in Innsbruck has established a new experimental platform for investigating quantum phenomena: In a string of trapped ultracold ions they can precisely initialise, control and measure the states and properties of quasiparticle excitations in a many-body quantum system.
“Quasiparticles are a well-established concept in physics to describe the collective behaviour of particles in a simplified way,” says Christian Roos.
For the experiment the physicists used a one-dimensional ion-string consisting of between seven and fifteen calcium ions trapped in a vacuum chamber. Laser beams then manipulate the quantum state of the ions. “Each particle behaves like a little quantum magnet interacting with each other,” explains Petar Jurcevic, first author of this study. “The precise excitation of one of the particles also affects the other particles. The resulting collective behaviour of the system is called quasiparticles.”
These quasiparticles disperse to both sides of the excitation site on the ion-string, thereby, transporting quantum correlations. Excitation distribution has previously been observed in experiments with neutral atoms, where correlations between particles have also been shown.
“In our experiments we have been able to determine that these correlations are quantum correlations,” says Roos. “By measuring multi-particle correlations we have been able to detect and quantify quantum entanglement.” The physicists were, thus, the first to show entanglement propagation in a quantum system.
In contrast to previous experiments, the researchers in Innsbruck can tune the ion-ion interaction range in the system from effectively nearest-neighbour to infinite range. In each case, a new set of quasiparticles is created with unique dynamical properties.
New research with quasiparticles
“With this new scheme we can precisely manipulate the quasiparticles,” says an excited Philipp Hauke, one of the authors of this study. “It has taken us decades to come up with ways to precisely control and manipulate quantum particles. With this platform we can now do the same with quasiparticles and investigate phenomena that we haven’t been able to study experimentally.”
For example, it opens up new paths to study how quantum systems reach equilibrium, including the question of when thermalisation occurs, a process that so far has remained elusive. “Another big goal is to utilize quasiparticles for quantum information processing,” says Hauke.
In addition, this platform could also be used to study the role of transport processes in biological systems. At the moment Christian Roos’ research team is working on the idea to investigate interaction processes between two quasiparticles.
The study, now published in Nature, was jointly conducted by Peter Zoller’s theoretical research group and Rainer Blatt’s experimental research team at the Institute for Quantum Optics and Quantum Information at the Austrian Academy of Sciences and the University of Innsbruck. The researchers are funded by the Austrian Science Fund, the European Commission, the European Research Council and the Federation of Austrian Industries Tyrol.
Publication: Quasiparticle engineering and entanglement propagation in a quantum many-body system. P. Jurcevic, B. P. Lanyon, P. Hauke, C. Hempel, P. Zoller, R. Blatt, and C. F. Roos. Nature 2014 DOI: 10.1038/nature13461
Institute for Quantum Optics and Quantum Information
Austrian Academy of Sciences
Phone: +43 512 507 4728
Phone: +43 512 507 32022
Mobile: +43 676 872532022
http://quantumoptics.at - Quantum Optics and Spectroscopy Group
Dr. Christian Flatz | Universität Innsbruck
Hubble observes one-of-a-kind star nicknamed 'Nasty'
22.05.2015 | NASA/Goddard Space Flight Center
Basel Physicists Develop Efficient Method of Signal Transmission from Nanocomponents
22.05.2015 | Universität Basel
Physicists have developed an innovative method that could enable the efficient use of nanocomponents in electronic circuits. To achieve this, they have developed a layout in which a nanocomponent is connected to two electrical conductors, which uncouple the electrical signal in a highly efficient manner. The scientists at the Department of Physics and the Swiss Nanoscience Institute at the University of Basel have published their results in the scientific journal “Nature Communications” together with their colleagues from ETH Zurich.
Electronic components are becoming smaller and smaller. Components measuring just a few nanometers – the size of around ten atoms – are already being produced...
Development and implementation of an advanced automobile parking navigation platform for parking services
To fulfill the requirements of the industry, PolyU researchers developed the Advanced Automobile Parking Navigation Platform, which includes smart devices,...
The world's first electrical car and passenger ferry powered by batteries has entered service in Norway. The ferry only uses 150 kWh per route, which...
On Tuesday, 19 May 2015 the research icebreaker Polarstern will leave its home port in Bremerhaven, setting a course for the Arctic. Led by Dr Ilka Peeken from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) a team of 53 researchers from 11 countries will investigate the effects of climate change in the Arctic, from the surface ice floes down to the seafloor.
RV Polarstern will enter the sea-ice zone north of Spitsbergen. Covering two shallow regions on their way to deeper waters, the scientists on board will focus...
Nanoengineers at the University of California, San Diego developed a gel filled with toxin-absorbing nanosponges that could lead to an effective treatment for skin and wound infections caused by MRSA (methicillin-resistant Staphylococcus aureus), an antibiotic-resistant bacteria. This "nanosponge-hydrogel" minimized the growth of skin lesions on mice infected with MRSA - without the use of antibiotics. The researchers recently published their findings online in Advanced Materials.
To make the nanosponge-hydrogel, the team mixed nanosponges, which are nanoparticles that absorb dangerous toxins produced by MRSA, E. coli and other...
20.05.2015 | Event News
18.05.2015 | Event News
12.05.2015 | Event News
26.05.2015 | Materials Sciences
26.05.2015 | Studies and Analyses
26.05.2015 | Earth Sciences