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Quantum Cat Experiment Breaks Record By Surviving For Incredible 1,400 Seconds

October 30, 2024 by Deborah Bloomfield

States in quantum superposition are notoriously fragile but researchers in China have reported creating such a state that lasted for a whopping 23 minutes and 20 seconds. This record-breaking result is exciting in itself but the team believes that it could open new ways to high-precision measurements and even information processing for quantum computers – possibly even allowing scientists to probe the limits of physical theories.

The study, which is yet to be peer-reviewed, conducted by scientists at the University of Science and Technology of China, saw 10,000 atoms of ytterbium cooled down to a few thousandths of a degree above absolute zero and trapped using light. Each atom could be controlled with great accuracy and was put into the superposition of two very different spin-states. This is known as a “quantum cat” state.

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In the famous Schrödinger’s cat thought experiment, we see a cat closed in a box with a poison activated by a random quantum process. Without opening the box we cannot ascertain the state of the cat, so it is both alive and dead, two contradictory states in the non-quantum reality we experience. In the quantum world, quantum cat states are superpositions where a quantum state can exist in several ways at once, although it’s impossible to tell which one it really is so it’s effectively all of them at once.

In the new experiment, it is the length of this quantum cat state that is astounding. In nature, the superposition will collapse into one or the other in a fraction of a second, but here it persisted for 1,400 seconds. The team thinks that with a better vacuum system, it can be made to last even longer.

“It’s a big deal because they’re making this beautiful cat state in an atomic system and it’s stable,” Barry Sanders, from the University of Calgary who was not involved in the study, told New Scientist. “A probe gets jiggled and pushed and nudged and prodded, and then by seeing what happens, you learn about the things that interact with it.”

The research shows that there are lots of different elements that can be used for these devices, it doesn’t have to be ytterbium, however, they did show that this particular setup with the ytterbium atoms is extremely sensitive to measuring magnetic fields, with exciting applications.

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This is not the only recent record-breaking event when it comes to quantum cat experiments. Last year, researchers successfully placed the heaviest macroscopic object in superposition. It was a crystal weighing just 16 micrograms but it shows that the field is truly breaking new ground into what is possible.

A preprint paper describing the experiment and the result is available on the ArXiv.

[H/T: New Scientist]

Deborah Bloomfield
Deborah Bloomfield

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Source Link: Quantum Cat Experiment Breaks Record By Surviving For Incredible 1,400 Seconds

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