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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum Sensing II (joint session Q/QI)
Q 54.5: Vortrag
Donnerstag, 13. März 2025, 12:15–12:30, HS I PI
Theoretical treatment of a closed-loop excitation scheme for phase-sensitive RF E-field sensing using Rydberg atom-based sensors — •Matthias Schmidt1,2, Stephanie Bohaichuk1, Vijin Venu1, Harald Kübler1,2, and James P. Shaffer1 — 1Quantum Valley Ideas Laboratories, 485 Wes Graham Way, Waterloo, ON N2L 0A7, Canada — 25. Physikalisches Institut and IQST, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
In this talk, we present theoretical work aimed at understanding radio frequency phase measurement using all-optical, atom-based electric field sensors. Atom-based radio frequency field sensors have a number of applications in communications, radar and test and measurement. All of these applications benefit from being able to detect phase, but Rydberg atom-based sensors in the steady state are square law detectors. We investigate closed-loop excitations in cesium that preserve phase information in a probe laser signal transmission amplitude coupled to one transition of the loop. Insight into the mechanisms that enable phase determination is gained by analyzing the closed-loop processes. We developed an experimental protocol that allows to measure the amplitude and phase of the incident RF wave over a wide range of parameters. Furthermore, we apply the weak probe approximation to the Lindblad-master equation and find an analytic expression for the absorption coefficient. With this expression, we gain a deeper understanding of the multi-photon interference and how this applies to phase readout in the atom-based radio frequency sensors.
Keywords: Quantum Sensing; RF E-field sensing; Electromagnetically Induced Transparency; Rydberg atoms