Monday , April 19 2021

Griffith researchers demonstrate the most accurate quantum measurement technique



Rresearchers from Queensland's Griffith University have demonstrated a method of measuring the acceleration, velocity and properties of materials that approximate the ultimate sensitivity allowed by the laws of quantum physics.

Recently Published in Nature Communications, the research led by Professor Geoff Pryde saw the research team combine three quantum measurement techniques: engagement, a type of quantum bond that may exist between photons (individual light particles). passing the light beams back and forth along the measurement path and a specially designed detection technique.

The method involved using photons to measure the distance traveled by the light beam compared to the reference beam of the partner as it passed through the measured sample – a thin crystal.

"Every time a photon passes through the sample, it does a kind of mini-measurement. The total count is the combination of all of these mini-measurements, "said Dr. Sergey Slussarenko of Griffith, who oversaw the experiment. Most of the photons are passed, the more accurate the measurement is made," he said.

"Our plan will serve as a plan for tools that can measure physical parameters with precision that is virtually impossible to achieve with common measuring devices."

According to the researchers, the design is theoretically capable of achieving Heisenberg's precise accuracy threshold by extracting the maximum amount of measurement information per photon.

Griffith's experiment is closer to achieving this than any other experiment, with the rest of the error being due only to experimental defect. While production of incumbent photons is a complex process with current technology, this achievement is important for fundamental science research and quantum computing algorithms.

Professor Howard Wiseman, co-designer of the project with Dr. Daryanoosh, said the plan can be extended to a larger number of incumbent photons, with a more significant difference than usually achievable accuracy. He said this method has other advantages.

"The very nice thing about this technique is that it works even when you do not have a good initial guess to measure it," he said.

"Previous work has focused mainly on where a very good start-up approach can be made, but this is not always possible."

Read the article Nature Communications.

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