Although Rydberg atom-based electric field sensing provides key advantages over traditional antenna-based detection, it remains limited by the need for a local oscillator (LO) for low-field and phase resolved detection. In this work, we demonstrate the general applicability of closed-loop quantum interferometric schemes for Rydberg field sensing, which eliminate the need for an LO. We reveal that the quantum-interferometrically defined phase and frequency of our scheme provides an internal reference that enables LO-free full 360 degree-resolved phase sensitivity. This internal reference can further be used analogously to a traditional LO for atom-based down-mixing to an intermediate frequency for lock-in-based phase detection, which we demonstrate by demodulating a four phase-state signal broadcast on the atoms.

On-resonance Rydberg atom-based radio-frequency (RF) electric field sensing methods remain limited by the narrow frequency signal detection bands available by resonant transitions. The use ofan additional RF tuner field to dress or shift a target Rydberg state can be used to return a detuned signal field to resonance and thus dramatically extend the frequency range available for resonantsensing. Here we compare three distinct tuning schemes based on adjacent Rydberg transitions, which are shown to have distinct tuning characteristics and can be tuned with mechanisms based onthe tuning field frequency or field strength. We further show that a two-photon Raman feature can be used as an effective tuning mechanism separate from conventional Autler-Townes splitting. Wecompare our tuning schemes to AC Stark effect-based broadband RF field sensing and show that although the sensitivity is diminished as we tune away from a resonant state, it nevertheless can beused in configurations where there is a low density of Rydberg states, which would result in a weak AC Stark effect.

Recent advances in Rydberg atom electrometry detail promising applications in radiofrequency (RF) communications. Presently, most applications use carrier frequencies greater than 1 GHz where resonant Autler-Townes splitting provides the highest antenna sensitivity. This letter documents a series of experiments with Rydberg atomic antennas to collect and process waveforms from the automated identification system (AIS) used in maritime navigation in the VHF band. This is difficult with conventional resonant Autler-Townes based Rydberg sensing. Measurements were taken using electrically induced transparency (EIT) in rubidium and cesium vapor cells. We show the results from a newly published method called High Angular Momentum Matching Excited Raman (HAMMER) that enhances low frequency detection and exhibits superior sensitivity compared to the traditional AC Stark effect detection. We show the relationship between incident electric field strength and observed signal to noise ratio. With these results, we estimate the useable range of the atomic vapor cell antenna for AIS waveforms given current technology and detection techniques.

Recent advances in Rydberg atom electrometry detail promising applications in radiofrequency (RF) communications. Presently, most applications use carrier frequencies greater than 1 GHz where resonant Autler-Townes splitting provides the highest antenna sensitivity. This letter documents a series of experiments with Rydberg atomic antennas to collect and process waveforms from the automated identification system (AIS) used in maritime navigation in the VHF band. This is difficult with conventional resonant Autler-Townes based Rydberg sensing. Measurements were taken using electrically induced transparency (EIT) in rubidium and cesium vapor cells. We show the results from a newly published method called High Angular Momentum Matching Excited Raman (HAMMER) that enhances low frequency detection and exhibits superior sensitivity compared to the traditional AC Stark effect detection. We show the relationship between incident electric field strength and observed signal to noise ratio. With these results, we estimate the useable range of the atomic vapor cell antenna for AIS waveforms given current technology and detection techniques.

Improving the bandwidth of Rydberg atom-based receivers is an ongoing challenge owing to the long-lived Rydberg state lifetimes that limit the refresh rate of ground state atoms.In particular, the LO-based Rydberg mixer approach allows for bandwidths into the few-MHz range.Here we use heterodyne detection of the Rydberg atom receiver probe laser to separate the negative and positive sidebands that originate from distinct six wave mixing processes in order to investigate their individual bandwidths.We experimentally confirm the prediction that the negative sideband exhibits a higher bandwidth than the positive sideband.We further explore the effect of coupling and probe laser Rabi frequency on the bandwidth, which we find to be in good agreement with our model. We achieved a maximum experimental (and theoretical) bandwidth of about 11 (11)~MHz and 3.5 (5)~MHz for the negative and positive sidebands, respectively, from the -3dB roll-off point for optimized field parameters.This work provides insight into the bandwidth-limiting features of Rydberg atom receivers and points the way towards further optimization of their response.

This dataset represents absorption/transmission spectra of resonant probe light power through a Rydberg atom vapor, subject to a simultaneous dressing field and a 'low frequency' field. Data is taken as an oscilloscope average of 5 photodiode voltage traces, with frequency offsets given by a simultaneous reference cell (not included). Some data are given as 2-D arrays, with axes of laser detuning across a waterfall of field strength. Some data represents theory eigen-energies of the system, for comparison. This paper will be submitted to Physical Review Letters.

Data associated with the publication: "Two-dimensional imaging of electromagnetic fields via light sheet fluorescence imaging with Rydberg atoms"Abstract:The ability to image electromagnetic fields holds key scientific and industrial applications, including electromagnetic compatibility, diagnostics of high-frequency devices, and experimental scientific work involving field interactions. Generally electric and magnetic field measurements require conductive elements which significantly perturb the field. However, electromagnetic fields can be measured non-perturbatively via the shift they induce on Rydberg states of alkali atoms in atomic vapor, which are highly sensitive to electric fields. Previous field measurements using Rydberg atoms utilized electromagnetically induced transparency to read out the shift on the states induced by the fields, but did not provide spatial resolution. In this work, we demonstrate that electromagnetically induced transparency can be spatially resolved by imaging the fluorescence of the probe. We demonstrate that this can be used to image $\sim$V/cm scale electric fields in the MHz-GHz range and $\sim$mT scale static magnetic fields, with minimal perturbation to the fields. We also demonstrate the ability to image $\sim$ V/m scale fields for resonant microwave radiation, although standing waves generated by the vapor cell walls obscure external field structure in this regime. We perform this field imaging with a spatial resolution of order 160 $\mu$m.This dataset contains the data associated with Figure 1 c,f,g, and h, Figure 2, Figure 3 b,d,f, and h, Figure 4 c,d, and e, Figure 5 b, c, and e, Figure 6, and the Supplemental Material's Figure 1.

This set corresponds to a (pending) publication, where we attempt to model spectral features appearing in the lab by calculating many segments of an inhomogeneous field. Every data set here is a transmission value, either normalized to 1 in modeled data, or an arbitrary-scaled voltage reading from a photodiode onto an oscilloscope. These are given in scans over coupling photon detuning, delta_C, which is divided by 2 pi, and given in MHz. Arrays are scans over delta_C, and position/fieldstrength, for figure 3. Data for figure 3 is given in a slightly unorthodox form, where the [electric field over position plot] and the [total transmission over detuning plot] are given along either of the large array's corresponding axes, matching the arrangement in Fig 3. All data is in CSV comma separated value form, with return characters between rows.

Data associated with the publication: "Zeeman-resolved Autler-Townes splitting in Rydberg atoms with a tunable RF resonance and a single transition dipole moment"Applying a magnetic field as a method for tuning the frequency of Autler-Townes splitting for Rydberg electrometry has recently been demonstrated. In the corresponding paper, we provide a theoretical understanding of EIT signals in the presence of a large magnetic field, as well as demonstrate some advantages of this technique over traditional Autler-Townes based electrometry. We show that a strong magnetic field provides a well-defined quantization axis regardless of the optical field polarizations, we demonstrate that by separating the $m_J$ levels of the Rydberg state we can perform an Autler-Townes splitting with a single participating dipole moment, and we demonstrate recovery of signal strength by populating a single $m_J$ level using circularly polarized light.Included in this dataset is the data associated with every plot in the paper, separated by figure number, including:FIgure 2: Measured EIT signals in the presence of a strong(1.85(1) mT) magnetic field either aligned with or orthogonalto the polarization axis. Figure 3: Theoretical EIT signals for Cs in the presence ofa 1.85(1) mT magnetic field for light polarizations alignedto or orthogonal to the magnetic field.Figure 4: Measured Autler-Townes splittings in individual mJlevels via the 58D5/2(mJ = ±5/2) ? 59P3/2(mJ = ±3/2)transitions of Cs in the presence of 2.78(1) mT.Figure 5: Measured Autler-Townes splittings on the Cs58D5/2 ? 59P3/2 transition with and without mJ selectivityfor various RF fields up to 3.08 V/m. Figure 6: EIT in the presence of a large magnetic field using circularly polarized light.EIT signals correspond to voltage traces (collected on an oscilloscope) of a balanced photodiode as laser frequencies are scanned. The x axis is converted from a time series of each voltage to a frequency using a reference cell. The scaling is determined by measuring the difference between the EIT peaks corresponding to the D5/2 and D3/2 Rydberg states, and the zero is generally taken to be the location of the D5/2 EIT peak.

This dataset contains the data for the figures in the paper "EIT spectra of Rydberg atoms dressed with dual tone radio-frequency fields", submitted to Physical Review A. This dataset can be used to recreate the experimental and theory plots from the CSV files. The data show EIT spectra of Rydberg atoms driven with dual-tone RF fields (experimental), and Floquet spectra of numerical models that are used to model these EIT spectra (theory/numerical). The data demonstrate spectra of driven Rydberg atoms in the strong field regime, and the models demonstrate the applicability of two-level Floquet spectra to reproduce the dominant spectral features.