Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Quantum steering for more precise measurements

Einstein-Podolski-Rosen correlations can be used for precision measurements. (Image: Jurik Peter, Shutterstock)
Einstein-Podolski-Rosen correlations can be used for precision measurements. (Image: Jurik Peter, Shutterstock)

Abstract:
Quantum systems consisting of several particles can be used to measure magnetic or electric fields more precisely. A young physicist at the University of Basel has now proposed a new scheme for such measurements that uses a particular kind of correlation between quantum particles.

Quantum steering for more precise measurements

Basel, Switzerland | Posted on April 23rd, 2021

In quantum information, the fictitious agents Alice and Bob are often used to illustrate complex communication tasks. In one such process, Alice can use entangled quantum particles such as photons to transmit or "teleport" a quantum state - unknown even to herself - to Bob, something that is not feasible using traditional communications.

However, it has been unclear whether the team Alice-Bob can use similar quantum states for other things besides communication. A young physicist at the University of Basel has now shown how particular types of quantum states can be used to perform measurements with higher precision than quantum physics would ordinarily allow. The results have been published in the scientific journal Nature Communications.

Quantum steering at a distance

Together with researchers in Great Britain and France, Dr. Matteo Fadel, who works at the Physics Department of the University of Basel, has thought about how high-precision measurement tasks can be tackled with the help of so-called quantum steering.

Quantum steering describes the fact that in certain quantum states of systems consisting of two particles, a measurement on the first particle allows one to make more precise predictions about possible measurement results on the second particle than quantum mechanics would allow if only the measurement on the second particle had been made. It is just as if the measurement on the first particle had "steered" the state of the second one.

This phenomenon is also known as the EPR paradox, named after Albert Einstein, Boris Podolsky and Nathan Rosen, who first described it in 1935. What is remarkable about it is that it works even if the particles are far apart because they are quantum-mechanically ?entangled? and can feel each other at a distance. This is also what allows Alice to transmit her quantum state to Bob in quantum teleportation.

"For quantum steering, the particles have to be entangled with each other in a very particular fashion," Fadel explains. "We were interested in understanding whether this could be used for making better measurements." The measurement procedure he proposes consists of Alice's performing a measurement on her particle and transmitting the result to Bob.

Thanks to quantum steering, Bob can then adjust his measurement apparatus such that the measurement error on his particle is smaller than it would have been without Alice's information. In this way, Bob can measure, for instance, magnetic or electric fields acting on his particles with high precision.

Systematic study of steering-enhanced measurements

The study of Fadel and his colleagues now makes it possible to systematically study and demonstrate the usefulness of quantum steering for metrological applications. "The idea for this arose from an experiment we already did in 2018 in the laboratory of Professor Philipp Treutlein at the University of Basel," says Fadel.

"In that experiment, we were able to measure quantum steering for the first time between two clouds containing hundreds of cold atoms each. After that, we asked ourselves whether it might be possible to do something useful with that." In his work, Fadel has now created a solid mathematical basis for realizing real-life measurement applications that use quantum steering as a resource.

"In a few simple cases, we already knew that there was a connection between the EPR paradox and precision measurements," Treutlein says. "But now we have a general theoretical framework, based on which we can also develop new strategies for quantum metrology." Researchers are already working on demonstrating Fadel's ideas experimentally. In the future, this could result in new quantum-enhanced measurement devices.

####

For more information, please click here

Contacts:
Reto Caluori

41-612-072-495

@UniBasel_en

Copyright © University of Basel

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

Physics

Ultrasound at the nanometre scale reveals the nature of force September 17th, 2021

Ultrafast & ultrathin: new physics professor at TU Dresden makes mysterious quantum world visible September 10th, 2021

News and information

Getting to the root of tooth replantation challenges: Researchers from Tokyo Medical and Dental University (TMDU) report a delivery system that promotes healing in tooth replantation in rats September 17th, 2021

Researchers reveal multi-path mechanism in electrochemical CO2 reduction September 17th, 2021

Scientists demonstrate pathway to forerunner of nanotubes that could lead to widespread industrial fabrication September 17th, 2021

Silver nanoparticles boost performance of microbial fuel cells September 17th, 2021

Quantum Physics

Engineering various sources of loss provides new features for perfect light absorption: "Loss is ubiquitous in nature, and by better understanding it, we make it more useful" September 10th, 2021

Tapping into magnets to clamp down on noise in quantum information September 9th, 2021

Putting a new theory of many-particle quantum systems to the test: Experiments show that generalized hydrodynamics accurately simulates an out-of-equilibrium quantum system September 3rd, 2021

Quantum communication

Engineering various sources of loss provides new features for perfect light absorption: "Loss is ubiquitous in nature, and by better understanding it, we make it more useful" September 10th, 2021

Possible Futures

New nano particles suppress resistance to cancer immunotherapy September 17th, 2021

New physics research reveals fresh complexities about electron behavior in materials September 17th, 2021

Scientists demonstrate pathway to forerunner of nanotubes that could lead to widespread industrial fabrication September 17th, 2021

Silver nanoparticles boost performance of microbial fuel cells September 17th, 2021

Discoveries

Ultrasound at the nanometre scale reveals the nature of force September 17th, 2021

A simple way to get complex semiconductors to assemble themselves: Much like crystallizing rock candy from sugar syrup, the new method grows 2D perovskites precisely layered with other 2D materials to produce crystals with a wide range of electronic properties September 17th, 2021

Getting to the root of tooth replantation challenges: Researchers from Tokyo Medical and Dental University (TMDU) report a delivery system that promotes healing in tooth replantation in rats September 17th, 2021

Researchers reveal multi-path mechanism in electrochemical CO2 reduction September 17th, 2021

Announcements

Getting to the root of tooth replantation challenges: Researchers from Tokyo Medical and Dental University (TMDU) report a delivery system that promotes healing in tooth replantation in rats September 17th, 2021

Researchers reveal multi-path mechanism in electrochemical CO2 reduction September 17th, 2021

Scientists demonstrate pathway to forerunner of nanotubes that could lead to widespread industrial fabrication September 17th, 2021

Silver nanoparticles boost performance of microbial fuel cells September 17th, 2021

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

New nano particles suppress resistance to cancer immunotherapy September 17th, 2021

New physics research reveals fresh complexities about electron behavior in materials September 17th, 2021

Good for groundwater – bad for crops? Plastic particles release pollutants in upper soil layers: The environmental geoscientists at the Centre for Microbiology and Environmental Systems Science (CMESS) focused on a variety of parameters that contribute to plastic pollution in far September 17th, 2021

Ultrasound at the nanometre scale reveals the nature of force September 17th, 2021

Quantum nanoscience

Engineering various sources of loss provides new features for perfect light absorption: "Loss is ubiquitous in nature, and by better understanding it, we make it more useful" September 10th, 2021

Tapping into magnets to clamp down on noise in quantum information September 9th, 2021

Researchers use gold film to enhance quantum sensing with qubits in a 2D material September 3rd, 2021

Best of both worlds—Combining classical and quantum systems to meet supercomputing demands: Scientists detect strongly entangled pair of protons on a nanocrystalline silicon surface, potentially enabling new levels of high-speed computing August 13th, 2021

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project