Griffith precision measurement takes it to the limit

phys.org | 11/5/2018 | Staff
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Griffith University researchers have demonstrated a procedure for making precise measurements of speed, acceleration, material properties and even gravity waves possible, approaching the ultimate sensitivity allowed by laws of quantum physics.

Published in Nature Communications, the work saw the Griffith team, led by Professor Geoff Pryde, working with photons (single particles of light) and using them to measure the extra distance travelled by the light beam, compared to its partner reference beam, as it went through the sample being measured—a thin crystal.

Researchers - Techniques—entanglement - Kind - Quantum - Connection

The researchers combined three techniques—entanglement (a kind of quantum connection that can exist between the photons), passing the beams back and forth along the measurement path, and a specially-designed detection technique.

"Every time a photon passes through the sample, it makes a kind of mini-measurement. The total measurement is the combination of all of these mini-measurements," said Griffith's Dr. Sergei Slussarenko, who oversaw the experiment. "The more times the photons pass through, the more precise the measurement becomes.

Scheme - Blueprint - Tools - Parameters - Precision

"Our scheme will serve as a blueprint for tools that can measure physical parameters with precision that is literally impossible to achieve with the common measurement devices.

Lead author of the paper Dr. Shakib Daryanoosh said this method can be used to investigate and measure other quantum systems.

Probe - Photon - Case - Photons - Way

"These can be very fragile, and every probe photon we send it would disturb it. In this case, using few photons but in the most efficient way possible is critical and our scheme shows how do exactly that," he said.

While one strategy is to just use...
(Excerpt) Read more at: phys.org
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