Thad Walker
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View article: Experimental observation of subabsorption
Experimental observation of subabsorption Open
We predict and experimentally demonstrate a new type of collective (cooperative) coupling effect where a disordered atomic ensemble absorbs light with a rise-time longer (i. e., at a rate slower) than what is dictated by single-atom physic…
View article: Exact steady state of perturbed open quantum systems
Exact steady state of perturbed open quantum systems Open
We present a general nonperturbative method to determine the exact steady state of open quantum systems under perturbation. The method works for systems with a unique steady state and the perturbation may be time-independent or periodic, a…
View article: Fast and Accurate Method for Doppler Averaging of Rydberg EIT Signals
Fast and Accurate Method for Doppler Averaging of Rydberg EIT Signals Open
Modeling the effect of Doppler broadening due to the thermal atomic motion of Rydberg sensors typically relies on sampling a large velocity class, solving the equations of motion for each velocity, and then averaging the atomic density mat…
View article: A numerical study of the spatial coherence of light in collective spontaneous emission
A numerical study of the spatial coherence of light in collective spontaneous emission Open
We present a numerical study of the spatial coherence of light that is radiated from a dilute ensemble of atoms. The spatial coherence is established as a result of the collective (cooperative) coupling of the atoms to the light, and is qu…
View article: Investigating electromagnetically induced transparency spectral lineshape distortion due to non-uniform fields in Rydberg-atom electrometry
Investigating electromagnetically induced transparency spectral lineshape distortion due to non-uniform fields in Rydberg-atom electrometry Open
We investigate the effects of spatially non-uniform radio-frequency electric (E) field amplitudes on the spectral line shapes of electromagnetically induced transparency (EIT) signals in Rydberg atomic systems used in electrometry (i.e., t…
View article: Combined Polarization/Magnetic Modulation of a Transverse NMR Gyroscope
Combined Polarization/Magnetic Modulation of a Transverse NMR Gyroscope Open
In this paper, we describe a new approach to the continuous operation of a transverse spin-exchange optically pumped NMR gyroscope that utilizes modulation of both the applied bias field and the optical pumping. We demonstrate the simultan…
View article: Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer
Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer Open
In this work, we look to compare three methods of feedback for the ultimate purpose of measuring the transverse vector components of a magnetic field using a synchronous light-pulse atomic scalar magnetometer with a few tens of fT/Hz sensi…
View article: Rydberg state engineering: A comparison of tuning schemes for continuous frequency sensing
Rydberg state engineering: A comparison of tuning schemes for continuous frequency sensing Open
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 of an additional RF tuner field to dress or shift …
View article: Spatial Coherence of Light in Collective Spontaneous Emission
Spatial Coherence of Light in Collective Spontaneous Emission Open
When a quantum system is put into an excited state, it will decay back to the\nground state through a process termed spontaneous emission. It is generally\nassumed that spontaneous emission between different individual emitters would\nnot …
View article: Continuous radio-frequency electric-field detection through adjacent Rydberg resonance tuning
Continuous radio-frequency electric-field detection through adjacent Rydberg resonance tuning Open
We demonstrate the use of multiple atomic-level Rydberg-atom schemes for\ncontinuous frequency detection of radio frequency (RF) fields. Resonant\ndetection of RF fields by electromagnetically-induced transparency and\nAutler-Townes (AT) i…
View article: An all-optical atomic gradiometer with sub-20 fT/cm/$\sqrt{\rm Hz}$ sensitivity in a 22 $\mu$T earth-scale magnetic field
An all-optical atomic gradiometer with sub-20 fT/cm/$\sqrt{\rm Hz}$ sensitivity in a 22 $\mu$T earth-scale magnetic field Open
In this work we demonstrate a high sensitivity atomic gradiometer capable of operation in earth-field level environments. We apply a light-pulse sequence at four times the Larmor frequency to achieve gradiometer sensitivity <20 fT/cm/$\sqr…
View article: Dataset for A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope
Dataset for A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope Open
All data presented in the manuscript "A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope." Each table in the file includes all data for one figure in the manuscript.
View article: Dataset for A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope
Dataset for A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope Open
All data presented in the manuscript "A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope." Each table in the file includes all data for one figure in the manuscript.
View article: Dual-Species Synchronous Spin-Exchange Optical Pumping
Dual-Species Synchronous Spin-Exchange Optical Pumping Open
We demonstrate a novel quantum sensor for measuring non-magnetic spin-dependent interactions. This sensor utilizes $^{131}$Xe, $^{129}$Xe, and $^{85}$Rb which are continuously polarized transverse to a pulsed bias field. The transverse geo…
View article: Continuous comagnetometry using transversely polarized Xe isotopes
Continuous comagnetometry using transversely polarized Xe isotopes Open
We demonstrate a transversely polarized spin-exchange pumped noble gas\ncomagnetometer which suppresses systematic errors from longitudinal\npolarization. Rb atoms as well as $^{131}$Xe and $^{129}$Xe nuclei are\nsimultaneously polarized p…
View article: Characterizing atomic magnetic gradiometers for fetal magnetocardiography
Characterizing atomic magnetic gradiometers for fetal magnetocardiography Open
Atomic magnetometers (AMs) offer many advantages over superconducting quantum interference devices due to, among other things, having comparable sensitivity while not requiring cryogenics. One of the major limitations of AMs is the challen…
View article: Dual-Axis <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>π</mml:mi></mml:math>-Pulse Magnetometer with Suppressed Spin-Exchange Relaxation
Dual-Axis -Pulse Magnetometer with Suppressed Spin-Exchange Relaxation Open
We present a spin-exchange relaxation-free vector magnetometer with suppressed 1/f probe noise, achieved by applying a small dc bias field and a comb of magnetic dc π pulses along the pump direction. This results in a synchronous orthogona…
View article: Dual-axis pi-pulse spin-exchange relaxation-free magnetometer
Dual-axis pi-pulse spin-exchange relaxation-free magnetometer Open
We present a new spin-exchange relaxation-free vector magnetometer with suppressed 1/f probe noise, achieved by applying a small DC bias field and a comb of magnetic DC $π$ pulses along the pump direction. This results in a synchronous ort…
View article: Parallel Low-Loss Measurement of Multiple Atomic Qubits
Parallel Low-Loss Measurement of Multiple Atomic Qubits Open
We demonstrate low-loss measurement of the hyperfine ground state of rubidium atoms by state dependent fluorescence detection in a dipole trap array of five sites. The presence of atoms and their internal states are minimally altered by ut…