Paschen-Back effect and Rydberg-state diamagnetism in vapor-cell electromagnetically induced transparency

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We report on rubidium vapor-cell Rydberg electromagnetically induced transparency (EIT) in a 0.7~T magnetic field where all involved levels are in the hyperfine Paschen-Back regime, and the Rydberg state exhibits a strong diamagnetic interaction with the magnetic field. Signals from both ⁸⁵Rb and ⁸⁷Rb are present in the EIT spectra. This feature of isotope-mixed Rb cells allows us to measure the field strength to within a ± 0.12% relative uncertainty. The measured spectra are in excellent agreement with the results of a Monte Carlo calculation and indicate unexpectedly large Rydberg-level dephasing rates. Line shifts and broadenings due to small inhomogeneities of the magnetic field are included in the model.