Spectroscopy of quantum many-body systems often relies on Fermi’s golden rule, but its regime of validity is unclear. Now measurements in a strongly interacting

Spectroscopy of quantum many-body systems often relies on Fermi’s golden rule, but its regime of validity is unclear. Now measurements in a strongly interacting Fermi gas map the probe dynamics and identify where the rule holds and breaks down. [↧](https://t.co/lDO47eutlo…