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Caltech physicists have successfully measured energy patterns in quantum simulators that were theoretically predicted for four decades, confirming the existence of specific universal behaviors in synthetic quantum matter. This breakthrough validates conformal field theory predictions regarding critical points driven by quantum effects rather than temperature changes, offering a new experimental tool to explore complex systems where theoretical answers are currently unknown.

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Caltech physicists finally measure a quantum energy ladder predicted 40 years ago

ScienceDailyOctober 1, 20266 min read

Researchers have experimentally observed energy patterns that physicists have predicted for about 40 years. By arranging laser-trapped atoms into a quantum simulator, they recreated two different quantum tipping points and watched the atoms fall into the exact energy ratios predicted by theory. The technique could now be used to explore mysterious quantum systems where scientists do not already know the answer.

When materials undergo major changes, such as water boiling or a magnet losing its magnetism, very different systems can sometimes start behaving according to the same mathematical rules. "Physicists call this trait universality -- the messy, microscopic details wash out and only a few essential features survive," explains Jason Alicea, William K. Davis Professor of Theoretical Physics. Physicists often describe this universal behavior using a mathematical framework known as conformal field theory. In a study published in Nature, researchers carried out the first experiments of their kind on two different conformal field theories using quantum simulators. These specialized systems are simpler than general purpose quantum computers…

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