Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 70: Quantum Optics
Q 70.5: Talk
Friday, March 15, 2024, 15:30–15:45, HS 3118
Analytic Expressions 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, Florian Christaller1, Chang Liu1, Harald Kübler1,2, and James P. Shaffer1 — 1Quantum Valley Ideas Laboratories, 485 Wes Graham Way, Waterloo, ON N2L 0A7, Canada — 25. Physikalisches Institut, Universität 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 measurements. All of these applications benefit from being able to detect phase, which remains illusive for Rydberg atom-based sensors in the steady-state. To obtain an analytic expression for phase detection, we investigate closed-loop excitations in cesium that preserve phase information in a probe laser signal transmission coupled to one transition of the loop. Insight into the mechanisms that enable phase determination is gained by analyzing the close-loop processes. We find the highest sensitivity region by looking at the absorption contrast. The sensitivity maximizes when the atomic vapor is weakly probed. By applying the weak probe approximation to the Lindblad-master equation, we 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 atom-based radio frequency sensors.
Keywords: Electromagnetically Induced Trasnparency; Phase sensitive RF sensing; RF E-field detection; Rydberg atoms; Hot vapor