Publications (13)
Lunar Silicon Cavity
Jun Ye, Zoey Z. Hu, Ben Lewis +5
The Moon's permanently shadowed regions (PSRs) are among the coldest places in the Solar System and are expected to become key landing sites for upcoming international space agency…
A grating-chip atomic fountain
Ben Lewis, Rachel Elvin, Aidan S. Arnold +2
Cold atom fountain clocks provide exceptional long term stability as they increase interrogation time at the expense of a larger size. We present a compact cold atom fountain using…
Atomic clock frequency ratios with fractional uncertainty
Alexander Aeppli, Willa J. Arthur-Dworschack, Kyle Beloy +24
We report high-precision frequency ratio measurements between optical atomic clocks based on Al, Yb, and Sr. With total fractional uncertainties at or bel…
A High-Power Clock Laser Spectrally Tailored for High-Fidelity Quantum State Engineering
Lingfeng Yan, Stefan Lannig, William R. Milner +5
Highly frequency-stable lasers are a ubiquitous tool for optical frequency metrology, precision interferometry, and quantum information science. While making a universally applicab…
Coherent evolution of superexchange interaction in seconds long optical clock spectroscopy
William R. Milner, Stefan Lannig, Mikhail Mamaev +7
Measurement science now connects strongly with engineering of quantum coherence, many-body states, and entanglement. To scale up the performance of an atomic clock using a degenera…
Cold-atom clock based on a diffractive optic
Rachel Elvin, Gregory W. Hoth, Michael Wright +5
Clocks based on cold atoms offer unbeatable accuracy and long-term stability, but their use in portable quantum technologies is hampered by a large physical footprint. Here, we use…
Phase-continuous comparison of three all-optical time scales over 20 days
Dahyeon Lee, Kyungtae Kim, Zoey Z. Hu +11
Optical frequency standards have progressed rapidly over the past two decades, leading to the anticipated redefinition of the SI second by an optical frequency. However, time scale…
A Fast Algorithm for Calculation of Thêo1
Ben Lewis
Thêo1 is a frequency stability statistic which is similar to the Allan variance but can provide stability estimates at longer averaging factors and with higher confidence. However…
Frequency stability of in a Si cavity with AlGaAs crystalline mirrors
Dahyeon Lee, Zoey Z. Hu, Ben Lewis +8
Developments in ultrastable lasers have fueled remarkable advances in optical frequency metrology and quantum science. A key ingredient in further improving laser frequency stabili…
An additive-manufactured microwave cavity for a compact cold-atom clock
Etienne Batori, Alan Bregazzi, Ben Lewis +4
We present an additive-manufactured microwave cavity for a Ramsey-type, double resonance, compact cold-atom clock. Atoms can be laser cooled inside the cavity using a grating magne…
A cold-atom Ramsey clock with a low volume physics package
Alan Bregazzi, Etienne Batori, Ben Lewis +4
We demonstrate a Ramsey-type microwave clock interrogating the 6.835~GHz ground-state transition in cold \textsuperscript{87}Rb atoms loaded from a grating magneto-optical trap (GM…
Mildly Overparameterized ReLU Networks on Orthogonal Data: Incremental Learning and Implicit Bias
James Town, Etienne Boursier, Ben Lewis +2
The successful training of neural networks hinges on the use of first order optimization methods, yet the theoretical characterization of these methods remains incomplete. This is…
Optical design for CETUS: a wide-field 1.5m aperture UV payload being studied for a NASA probe class mission study
Robert A. Woodruff, William C. Danchi, Sara R. Heap +12
As part of a study funded by NASA Headquarters, we are developing a Probe-class mission concept called the Cosmic Evolution Through UV Spectroscopy (CETUS). CETUS includes a 1.5-m…