# Browse Physics

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Variations in density in an ultracold gas reveal sound waves of quantum origin.

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A generalization of one of the most famous experiments in quantum foundations provides a powerful new unifying concept.

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The sloshing of light between optical waveguides replicates the quantum-mechanical exchange between an atom and an electromagnetic mode.

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A technique from ion spectroscopy reveals the quantum nature of a mechanical system at low temperature.

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A new thought experiment makes it clearer than ever that photons aren’t simply particles or waves.

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Although the quantum Rabi model is the simplest model describing the coupling of quantum light and matter, only now has an analytical solution been found.

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In the Aharonov-Bohm effect, proposed in 1959, quantum particles are affected in measurable ways by the classical electromagnetic potential, previously regarded as a purely mathematical construct. The electromagnetic field is too far from the particles to have any direct influence.

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A newly found fundamental limitation puts bounds on the accuracy of measurements in quantum-mechanical systems.