Very-high- and ultrahigh-frequency electric-field detection using high angular momentum Rydberg states

We demonstrate resonant detection of rf electric fields from 240 to 900 MHz (very high frequency ultrahigh frequency) using electromagnetically induced transparency measure orbital angular momentum $L=3\ensuremath{\rightarrow}{L}^{\ensuremath{'}}=4$ Rydberg transitions. These states are accessible with three-photon infrared optical excitation. By resonantly detecting in the electrically small regime, these enable a new class atomic receivers. find good agreement between measured spectra and predictions quantum defect theory for principal numbers $n=45$ 70. Using superhetrodyne setup, we noise floor at $n=50$ be $13\phantom{\rule{0.16em}{0ex}}\textmu{}\mathrm{V}/(\mathrm{m}\sqrt{\mathrm{Hz}})$. Additionally, utilize data numerical model incorporating five-level master equation solution estimate fundamental sensitivity limits our system.