Featured Research

from universities, journals, and other organizations

New results make development of quantum computers more realistic

Date:
December 12, 2013
Source:
Kassel, Universität
Summary:
New research will make the eventual development of the quantum computer more feasible.

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 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.


Story Source:

The above story is based on materials provided by Kassel, Universität. Note: Materials may be edited for content and length.


Journal Reference:

  1. Daniel M. Reich, Giulia Gualdi, Christiane P. Koch. Optimal Strategies for Estimating the Average Fidelity of Quantum Gates. Physical Review Letters, 2013; 111 (20) DOI: 10.1103/PhysRevLett.111.200401

Cite This Page:

Kassel, Universität. "New results make development of quantum computers more realistic." ScienceDaily. ScienceDaily, 12 December 2013. <www.sciencedaily.com/releases/2013/12/131212095644.htm>.
Kassel, Universität. (2013, December 12). New results make development of quantum computers more realistic. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2013/12/131212095644.htm
Kassel, Universität. "New results make development of quantum computers more realistic." ScienceDaily. www.sciencedaily.com/releases/2013/12/131212095644.htm (accessed August 21, 2014).

Share This




More Computers & Math News

Thursday, August 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Families Can Now Ask Twitter To Remove Photos Of Deceased

Families Can Now Ask Twitter To Remove Photos Of Deceased

Newsy (Aug. 20, 2014) — In the wake of a high-profile harassment case, Twitter says family members can ask for photos of dying or dead relatives to be taken down. Video provided by Newsy
Powered by NewsLook.com
Ballmer Leaves Microsoft's Board, Has Advice For Nadella

Ballmer Leaves Microsoft's Board, Has Advice For Nadella

Newsy (Aug. 19, 2014) — In a letter to Microsoft CEO Satya Nadella, Ballmer said he's leaving the board of directors and offered tips on how the company can be successful. Video provided by Newsy
Powered by NewsLook.com
What Google Can Gain From Special Accounts For Children

What Google Can Gain From Special Accounts For Children

Newsy (Aug. 19, 2014) — Google will reportedly offer official accounts for children younger than 13 years old. Video provided by Newsy
Powered by NewsLook.com
Breakingviews: Ebola's Economic Impact Could Eclipse SARS

Breakingviews: Ebola's Economic Impact Could Eclipse SARS

Reuters - Business Video Online (Aug. 18, 2014) — The virus ravaging Africa has yet to spread elsewhere. Yet Asia’s SARS crisis in 2003 showed how changes to behaviour can hurt the economy more than the actual disease, says Breakingviews' Una Galani. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins