Description
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.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| README | Unknown | README | Open resource |
| Data for figure 2: This data shows the stark shifting present for the 49 G and 49 F rydberg states. | Unknown | The stark maps show the effects of external electric fields on the Rydberg states. We also see that the 49 G and the 49 F states separate based on their mj contribution. The polarizabilities to determine the shifts were calculated using the ARC rydberg atom calculator. | Open resource |
| Figure 4 data: Spectrum of signal received | Unknown | This data is from figure 4 which shows the spectrum of the signal received for different values of electric field strengths received. | Open resource |
| Figure 5 data: SNR vs field strength received | Unknown | This is data for figure 5. The data was extracted from figure 4. We integrate the signal spectrum and the noise and take the ration of the two to determine the signal to noise (SNR) in dB. | Open resource |
| Figure 6 data: Packet success rate vs field strength received | Unknown | This is data for figure 6. We use the software defined radio to receive modulated signal packet and check what ratio of packets pass a checksum to determine if the data was received well. We do this for both the Stark and Hammer method for both atoms. So there are four data groups in the file. | Open resource |
| Figure 7 data: SNR improvement utilizing a split ring resonator | Unknown | This is data for figure 7. We compare the effect of the SNR in the presence and absence of a split ring resonator that has been known to improve measurement. | Open resource |
| Data for figure 9. | Unknown | This data is the calibration data for the Cs atoms and the Rb atoms. It shows the experimental measurement of the stark shift for different applied powers of the radio. | Open resource |