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 The TU Ilmenau develops tomorrow’s chip technology today
27.04.2017 | Technische Universität Ilmenau

nachricht Five developments for improved data exploitation
19.04.2017 | Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>