Quantum devices allow us to accomplish computing and sensing tasks that go beyond the capabilities of their classical counterparts. However, protecting quantum information from being corrupted by errors is difficult.
An international team of researchers from Innsbruck, Harvard, Copenhagen and Waterloo put forward a new method to protect quantum information stored in trapped ions. In their new proposal, the authors use dissipation (i.e. the interaction of a quantum system with its environment) to correct quantum states. Dissipation is typically considered harmful, but as demonstrated by Florentin Reiter and colleagues, it can be tweaked to work in a quantum engineer’s favor.
Standard quantum error correction schemes are performed by applying a sequence of gates in a logical quantum circuit and rely on measurements by classical devices. The new dissipative approach does not require a logical circuit and dispenses also with measurements.
“The whole error correcting process happens autonomously at the microscopic level, such that quantum systems can correct themselves”, said co-author Christine Muschik, of the Department of Theoretical Physics at the University of Innsbruck and the Institute of Quantum Optics and Quantum Information at the Austrian Academy of Sciences.
The new approach has important practical applications for high-precision measurements. “We showed how the new dissipative correction mechanism can be used to enhance the precision for sensing weak magnetic fields”, Muschik said. These results open new avenues for improving high-precision sensing schemes with trapped ions and constitute a stepping stone towards the paradigm of self-correcting quantum information processing.
Publication: Dissipative Quantum Error Correction and Application to Quantum Sensing with Trapped Ions. F. Reiter, A. Sørensen, P. Zoller, and C. Muschik. Nature Communications 2017 DOI: 10.1038/s41467-017-01895-5
Department of Theoretical Physics
University of Innsbruck
phone: +43 512 507-52263
Public Relations Office
University of Innsbruck
phone: +43 512 507 32022
http://dx.doi.org/10.1038/s41467-017-01895-5 - Dissipative Quantum Error Correction and Application to Quantum Sensing with Trapped Ions. F. Reiter, A. Sørensen, P. Zoller, and C. Muschik. Nature Communications 2017
http://www.uibk.ac.at/th-physik/qo/ - Quantum Optics Group
Dr. Christian Flatz | Universität Innsbruck
Exoplanet stepping stones
21.11.2018 | W. M. Keck Observatory
First diode for magnetic fields
21.11.2018 | Universität Innsbruck
Innsbruck quantum physicists have constructed a diode for magnetic fields and then tested it in the laboratory. The device, developed by the research groups led by the theorist Oriol Romero-Isart and the experimental physicist Gerhard Kirchmair, could open up a number of new applications.
Electric diodes are essential electronic components that conduct electricity in one direction but prevent conduction in the opposite one. They are found at the...
Max Planck researchers revel the nano-structure of molecular trains and the reason for smooth transport in cellular antennas.
Moving around, sensing the extracellular environment, and signaling to other cells are important for a cell to function properly. Responsible for those tasks...
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
19.11.2018 | Event News
09.11.2018 | Event News
06.11.2018 | Event News
21.11.2018 | Life Sciences
21.11.2018 | Medical Engineering
21.11.2018 | Physics and Astronomy