Nanotechnology Now – Press Release: Quantum steering for more precise measurements

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

Summary:
Quantum methods consisting of a number of particles can be utilized to measure magnetic or electrical fields extra exactly. A younger physicist on the College of Basel has now proposed a brand new scheme for such measurements that makes use of a selected sort of correlation between quantum particles.

Quantum steering for extra exact measurements


Basel, Switzerland | Posted on April 23rd, 2021

In quantum info, the fictional brokers Alice and Bob are sometimes used as an instance advanced communication duties. In a single such course of, Alice can use entangled quantum particles resembling photons to transmit or “teleport” a quantum state – unknown even to herself – to Bob, one thing that isn’t possible utilizing conventional communications.

Nonetheless, it has been unclear whether or not the staff Alice-Bob can use comparable quantum states for different issues apart from communication. A younger physicist on the College of Basel has now proven how explicit sorts of quantum states can be utilized to carry out measurements with greater precision than quantum physics would ordinarily enable. The outcomes have been printed within the scientific journal Nature Communications.

Quantum steering at a distance

Along with researchers in Nice Britain and France, Dr. Matteo Fadel, who works on the Physics Division of the College of Basel, has thought of how high-precision measurement duties may be tackled with the assistance of so-called quantum steering.

Quantum steering describes the truth that in sure quantum states of methods consisting of two particles, a measurement on the primary particle permits one to make extra exact predictions about attainable measurement outcomes on the second particle than quantum mechanics would enable if solely the measurement on the second particle had been made. It’s simply as if the measurement on the primary particle had “steered” the state of the second.

This phenomenon is also called the EPR paradox, named after Albert Einstein, Boris Podolsky and Nathan Rosen, who first described it in 1935. What’s exceptional about it’s that it really works even when the particles are far aside as a result of they’re quantum-mechanically ?entangled? and may really feel one another at a distance. That is additionally what permits Alice to transmit her quantum state to Bob in quantum teleportation.

“For quantum steering, the particles should be entangled with one another in a really explicit vogue,” Fadel explains. “We have been interested by understanding whether or not this may very well be used for making higher measurements.” The measurement process he proposes consists of Alice’s performing a measurement on her particle and transmitting the end result to Bob.

Because of quantum steering, Bob can then alter his measurement equipment such that the measurement error on his particle is smaller than it could have been with out Alice’s info. On this method, Bob can measure, as an illustration, magnetic or electrical fields performing on his particles with excessive precision.

Systematic examine of steering-enhanced measurements

The examine of Fadel and his colleagues now makes it attainable to systematically examine and display the usefulness of quantum steering for metrological purposes. “The thought for this arose from an experiment we already did in 2018 within the laboratory of Professor Philipp Treutlein on the College of Basel,” says Fadel.

“In that experiment, we have been capable of measure quantum steering for the primary time between two clouds containing a whole lot of chilly atoms every. After that, we requested ourselves whether or not it is likely to be attainable to do one thing helpful with that.” In his work, Fadel has now created a strong mathematical foundation for realizing real-life measurement purposes that use quantum steering as a useful resource.

“In a number of easy instances, we already knew that there was a connection between the EPR paradox and precision measurements,” Treutlein says. “However now we now have a basic theoretical framework, based mostly on which we will additionally develop new methods for quantum metrology.” Researchers are already engaged on demonstrating Fadel’s concepts experimentally. Sooner or later, this might end in new quantum-enhanced measurement units.

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For extra info, please click on right here

Contacts:
Reto Caluori

41-612-072-495

@UniBasel_en

Copyright © College of Basel

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Issuers of reports releases, not seventh Wave, Inc. or Nanotechnology Now, are solely answerable for the accuracy of the content material.

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