Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Kassel University research team’s results make the development of quantum computers more realistic

12.12.2013
Together with a supporting research team, Kassel physicist Prof. Dr. Christiane Koch has made a discovery that is sure to attract significant attention among experts. Criteria established in the course of her research make the eventual development of the quantum computer more feasible.

Is there a flow of electrical current or not? Until now, the register of traditional bit computers can only determine between these two basic states. Complicated operations that depend on this distinction, such as the decryption of a coded message, take a correspondingly long period of time to complete.

Computer scientists are hopeful that the development of quantum computers will facilitate an exponential acceleration of such processes. This would be possible because the quantum bits (or qubits) of a quantum computer can recognise multiple states at the same time, thereby making it possible for various logical operations to be executed simultaneously. This in turn would finally make it possible to handle calculations that are currently beyond the capacity of current technologies.

While the first quantum computers are indeed able to calculate very rapidly on this basis, the verification of the quantum operations has until now continued to take a large amount of time. This is mainly because the importing and exporting of the relevant information still has to take place in the tradition manner.

Put simply, this means that the more qubits a quantum register has, the more time and effort is required to determine its condition following a logical operation. With the current protocols it takes several days to ascertain whether a quantum operation has been correctly executed, even with a small number of qubits.

For the verification of 3 qubits, for example, 2 billion measurements are required. Even assuming that each of these measurements only lasts a microsecond, the measurement process in this instance will take an hour. In addition, with increasing numbers of qubits significantly more random checks must be undertaken, so that the verification of just 8 qubits requires a measurement time of one year.

In their study published in the prestigious journal “Physical Review Letters”, Daniel Reich, Dr. Giulia Gualdi und Prof. Dr. Koch have now shown how such operations can be verified with minimal resources. “The resources are a significant factor less than has heretofore been assumed,” commented Prof. Dr. Koch, the leader of the research group Quantum Dynamics and Control at Kassel University.

Through an ingenious use of the mathematical characteristics of quantum operations, the Kassel research team has demonstrated a way to achieve a considerable reduction in the necessary measurement time. For the verification of 8 qubits, only 3 days as opposed to hundreds of days will be required.

“We have shown how one can best, that is to say how one can most efficiently test if the components of a quantum computer are functioning as they should,” explains researcher Koch about the process. This will make it possible for designers of quantum computers to decide which protocol is most suitable for the concrete realisation of such a computer. This brings the real use of quantum computers one step closer. The Kassel research team’s results will soon be tested in the context of a practical study.

Contact:

Prof. Dr. Christiane Koch
University of Kassel
FB 10 – Mathematics and Natural Sciences
Institute of Physics
Research Group: Theoretical Physics III / Quantum Dynamics and Control
Tel. 0561 804-4407/4785 (department secretary)
E-Mail: christiane.koch@uni-kassel.de
Publication: Phys. Rev. Lett. 111, 200401 (2013).

Sebastian Mense | idw
Further information:
http://www.uni-kassel.de

More articles from Information Technology:

nachricht Ultra-precise chip-scale sensor detects unprecedentedly small changes at the nanoscale
18.01.2017 | The Hebrew University of Jerusalem

nachricht Data analysis optimizes cyber-physical systems in telecommunications and building automation
18.01.2017 | Fraunhofer-Institut für Algorithmen und Wissenschaftliches Rechnen SCAI

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>