Topic
Use of programmable quantum platforms, like trapped ions and neutral-atom arrays, as task-specific simulators of physics rather than general computers.
Caltech physicists measured energy ladders two conformal field theories have predicted for about 40 years, using a line of laser-trapped strontium atoms. It is the known-answer test a simulator must pass before it is trusted on unsolved systems.
Reality
Duke-led physicists used 13 trapped ions to reproduce string breaking, in which a stretched bond between particles snaps and new pairs form. Two other teams saw similar physics on other hardware, though at this size any payoff for particle physics is still a forecast.
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Physicists mapped the electronic topology of 8,872 atomically thin materials and named over 1,600 twisting candidates in two Science papers. The lists are calculations that tell labs where to look, and testing them in twisted devices comes next.
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String-breaking, the moment a stretched bond between two building blocks of matter snaps and new particles appear, has now been observed on a trapped-ion quantum simulator at Duke. Two other groups saw it on different hardware.
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Physicists in Stuttgart kept a circular Rydberg atom's electron in a stable orbit for 11 milliseconds without cryogenic cooling, and held the atom in an optical tweezer for 133 milliseconds. Both are records for these giant atoms.
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Physicists at Louisiana State University report a quantum reservoir built from bright classical light and photon-by-photon detection, running at room temperature with 861 measurable components and multiphoton systems as large as 40 photons.
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Modulation spectroscopy on a neutral atom chain recovered the universal energy ratios of Ising and tricritical Ising CFTs, according to a report in Nature. Boundary conditions were set by local detunings at the edges.
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Caltech's Endres and Alicea groups report the first direct measurement of Ising and tricritical Ising energy spectra in synthetic quantum matter, on chains of up to 35 strontium atoms.
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