Enhancement of electromagnetically induced transparency based Rydberg-atom electrometry through population repumping

Abstract

We demonstrate improved sensitivity of Rydberg electrometry based on electromagnetically induced transparency (EIT) with a ground state repumping laser. Though there are many factors that limit the sensitivity of radio frequency field measurements, we show that repumping can enhance the interaction strength while avoiding additional Doppler or power broadening. Through this method, we nearly double the EIT amplitude without an increase in the width of the peak. A similar increase in amplitude without the repumping field is not possible through simple optimization. We also establish that one of the key limits to detection is the photon shot noise of the probe laser. We show an improvement on the sensitivity of the device by a factor of nearly 2 in the presence of the repump field.

Intra-Cavity Frequency-Doubled VECSEL System for Narrow Linewidth Rydberg EIT Spectroscopy

“…This is, to the best of our knowledge, the narrowest reported atomic spectroscopy using a frequency-doubled VECSEL. It is also consistent with narrow Rydberg-EIT linewidths reported in the literature that range from 2-10 MHz [22,[46][47][48][49]. There is no indication from the measured EIT linewidth that the frequency noise of the VECSEL's doubled output significantly differs from that of the fundamental, which was characterized above.…”

VHF/UHF detection using high angular momentum Rydberg states

“…For the data shown in Figure 2 a, we estimate ∆E psn = 13 µV/m/ √ Hz, a factor of 100 higher than E qpn . To approach these sensitivity limits a number of technical improvements may be made including the addition of: a second probe beam to remove intensity noise, a laser to repump ground state population [50], and a rf local oscillator field to implement super-heterodyne detection [3,4].…”

TV and Video Game Streaming with a Quantum Receiver: A Study on a Rydberg atom-based receivers bandwidth and reception clarity

“…This is possible since Rydberg states are highly sensitive to electric fields and depending on the Rydberg state used, allow for detecting fields ranging from DC to THz. They have been used for the detection of electric fields for AM/FM (and phase modulation) receivers 2-9 , spectrum analyzers 10 , voltage standards 11 , angle-of-arrival 12 , and many more applications [13][14][15][16][17] . These sensors even allow for calibrated measurements traceable to the international system of units (SI) 18 for both electrical and radio frequency power [19][20][21][22] .…”