Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

When Particles Fall Left and Right at the Same Time

01.08.2014

Heidelberg physicists develop new method to verify quantum entanglement

It takes only a slight disturbance for a pencil standing on its tip to fall in one direction or another. In the quantum world it is possible in principle for particles of a system to fall both left and right at the same time.

Differentiating this “and” state – the quantum entanglement of particles – from the classical “or” is an experimental challenge. Scientists from Heidelberg University’s Kirchhoff Institute for Physics have now devised a novel and universal method that enables entanglement verification for states of large atomic systems. The results of their research in the field of quantum metrology were published in “Science”.

In their experiments, the team headed by Prof. Dr. Markus Oberthaler used a classically unstable state of an ultracold atomic gas known as a Bose-Einstein condensate. This condensate is an extreme aggregate state of a system of indistinguishable particles, most of which are in the same quantum mechanical state.

The Heidelberg researchers used a gas of approximately 500 atoms at a temperature of 0.00000001 Kelvin above absolute zero. After a short time a system with a high degree of quantum entanglement emerged. To be able to experimentally verify this “and” state and its unique quantum mechanical properties, the team had to create a large number of these atomic systems under the same conditions and with different settings of the lab setup.

“This process required measurements over several weeks, during which the fluctuations of the magnetic field applied had to be 10,000 times smaller than the magnetic field of the earth,” explained the study’s primary author, Helmut Strobel.

Another challenge was to correctly analyse the measurements, which required the development of new statistical concepts. The goal was to extract the metrologically relevant information from the measured data. This so-called Fisher information, named after geneticist and statistician Ronald A. Fisher, explicitly and universally quantifies the sensitive dependence of a given quantum mechanical state on the metrologically relevant parameters.

According to Markus Oberthaler, conventional methods simply do not work in an atomic Bose-Einstein condensate of this size. Furthermore, the novel method can be used for even larger systems. “We can use it to verify the suitability of any experimental quantum state for precision measurements beyond what can be done with a classical state,” continues Prof. Oberthaler. “This is a hot topic in the field of quantum metrology.”

Markus Oberthaler heads the Synthetic Quantum Systems working group at the Kirchhoff Institute for Physics. Researchers from the Quantum Science and Technology in Arcetri (QSTAR) research centre and the European Laboratory for Non-Linear Spectroscopy (LENS) also contributed to the work.

Internet information:
http://www.kip.uni-heidelberg.de/matterwaveoptics

Original publication:
H. Strobel, W. Muessel, D. Linnemann, T. Zibold, D.B. Hume, L. Pezzè, A. Smerzi, M.K. Oberthaler: Fisher information and entanglement of non-Gaussian spin states. Science 25 July 2014: Vol. 345 no. 6195 pp. 424-427, doi: 10.1126/science.1250147

Contact:
Prof. Dr. Markus Oberthaler
Kirchhoff Institute for Physics
Phone: +49 6221 54-5170
markus.oberthaler@kip.uni-heidelberg.de

Communications and Marketing
Press Office, phone: +49 6221 54-2311
presse@rektorat.uni-heidelberg.de

Marietta Fuhrmann-Koch | idw - Informationsdienst Wissenschaft

Further reports about: Bose-Einstein Fisher Physics Quantum conditions conventional measurements

More articles from Physics and Astronomy:

nachricht Liquids on Fibers - Slipping or Flowing?
01.07.2015 | Universität des Saarlandes

nachricht NASA missions monitor a waking black hole
01.07.2015 | NASA/Goddard Space Flight Center

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: X-rays and electrons join forces to map catalytic reactions in real-time

New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions

A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...

Im Focus: Iron: A biological element?

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...

Im Focus: Thousands of Droplets for Diagnostics

Researchers develop new method enabling DNA molecules to be counted in just 30 minutes

A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...

Im Focus: Bionic eye clinical trial results show long-term safety, efficacy vision-restoring implant

Patients using Argus II experienced significant improvement in visual function and quality of life

The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...

Im Focus: Lasers for Fast Internet in Space – Space Technology from Aachen

On June 23, the second Sentinel mission was launched from the space mission launch center in Kourou. A critical component of Aachen is on board. Researchers at the Fraunhofer Institute for Laser Technology ILT and Tesat-Spacecom have jointly developed the know-how for space-qualified laser components. For the Sentinel mission the diode laser pump module of the Laser Communication Terminal LCT was planned and constructed in Aachen in cooperation with the manufacturer of the LCT, Tesat-Spacecom, and the Ferdinand Braun Institute.

After eight years of preparation, in the early morning of June 23 the time had come: in Kourou in French Guiana, the European Space Agency launched the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

World Conference on Regenerative Medicine: Abstract Submission has been extended to 24 June

16.06.2015 | Event News

MUSE hosting Europe’s largest science communication conference

11.06.2015 | Event News

 
Latest News

Offshore wind park Westermost Rough officially inaugurated

01.07.2015 | Press release

Siemens Velaro train wins "Red Dot" award

01.07.2015 | Awards Funding

Liquids on Fibers - Slipping or Flowing?

01.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>