Publications (21)
A many-channel FPGA control system
Daniel T. Schussheim, Kurt Gibble
We describe a many-channel experiment control system based on a field-programmable gate array (FPGA). The system has 16 bit resolution on 10 analog 100 MS/s input channels, 14 anal…
A Quantum Scattering Interferometer
Russell A. Hart, Xinye Xu, Ronald Legere +1
The collision of two ultra-cold atoms results in a quantum-mechanical superposition of two outcomes: each atom continues without scattering and each atom scatters as a spherically…
Lattice Light Shift Evaluations In a Dual-Ensemble Yb Optical Lattice Clock
Tobias Bothwell, Benjamin D. Hunt, Jacob L. Siegel +9
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we report a novel approac…
Rydberg Spectroscopy in an Optical Lattice: Blackbody Thermometry for Atomic Clocks
Vitali D. Ovsiannikov, Andrei Derevianko, Kurt Gibble
We show that optical spectroscopy of Rydberg states can provide accurate {\em in situ} thermometry at room-temperature. Transitions from a metastable state to Rydberg states with p…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
Progress in Atomic Fountains at LNE-SYRTE
Jocelyne Guéna, Michel Abgrall, Daniele Rovera +10
We give an overview of the work done with the Laboratoire National de Métrologie et d'Essais-Systèmes de Référence Temps-Espace (LNE-SYRTE) fountain ensemble during the last fi…
Scattering of Cold Atom Coherences by Hot Atoms: Frequency Shifts from Background Gas Collisions
Kurt Gibble
Frequency shifts from background gas collisions currently contribute significantly to the inaccuracy of atomic clocks. Because nearly all collisions with room-temperature backgroun…
Evaluating and Minimizing Distributed Cavity Phase Errors in Atomic Clocks
Ruoxin Li, Kurt Gibble
We perform 3D finite element calculations of the fields in microwave cavities and analyze the distributed cavity phase errors of atomic clocks that they produce. The fields of cyli…
Ratchet Loading and Multi-Ensemble Operation in an Optical Lattice Clock
Youssef S. Hassan, Takumi Kobayashi, Tobias Bothwell +6
We demonstrate programmable control over the spatial distribution of ultra-cold atoms confined in an optical lattice. The control is facilitated through a combination of spatial ma…
Fundamental Physics with a State-of-the-Art Optical Clock in Space
Andrei Derevianko, Kurt Gibble, Leo Hollberg +5
Recent advances in optical atomic clocks and optical time transfer have enabled new possibilities in precision metrology for both tests of fundamental physics and timing applicatio…
S-Wave Collisional Frequency Shift of a Fermion Clock
Eric L. Hazlett, Yi Zhang, Ronald W. Stites +2
We report an s-wave collisional frequency shift of an atomic clock based on fermions. In contrast to bosons, the fermion clock shift is insensitive to the population difference of…
Spin waves and Collisional Frequency Shifts of a Trapped-Atom Clock
Wilfried Maineult, Christian Deutsch, Kurt Gibble +2
We excite spin-waves with spatially inhomogeneous pulses and study the resulting frequency shifts of a chip-scale atomic clock of trapped Rb. The density-dependent frequency…
Laser-cooling Cadmium Bosons and Fermions with Near Ultraviolet Triplet Excitations
Kurt Gibble
Cadmium is laser-cooled and trapped with excitations to triplet states with UVA light, first using only the kHz wide nm intercombination line and subsequently, for lar…
Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions
Kurt Gibble
We perform exact calculations of collisional frequency shifts for several fermions or bosons using a singlet and triplet basis for pairs of particles. The "factor of 2 controversy"…
Comment on "Frequency shifts in NIST Cs primary frequency standards due to transverse rf field gradients"
Kurt Gibble
We discuss the theoretical treatment of the microwave lensing frequency shift of the NIST-F1 and F2 atomic fountain clocks by Ashby et al. [Phy. Rev. A. 91, 033624 (2015)]. The shi…
Comment on "first accuracy evaluation of NIST-F2"
Kurt Gibble
We discuss the treatment of the systematic frequency shifts due to microwave lensing and distributed cavity phase in "First accuracy evaluation of NIST-F2" 2014 Metrologia 51 174-1…
Atomic Clock Measurements of Quantum Scattering Phase Shifts Spanning Feshbach Resonances at Ultralow Fields
Aaron Bennett, Kurt Gibble, Servaas Kokkelmans +1
We use an atomic fountain clock to measure quantum scattering phase shifts precisely through a series of narrow, low-field Feshbach resonances at average collision energies below $…
Direct Observation of Resonant Scattering Phase Shifts and their Energy Dependence
Stephen D. Gensemer, Ross B. Martin-Wells, Aaron W. Bennett +1
We scan the collision energy of two clouds of cesium atoms between 12 and 50 K in atomic fountain clock. By directly detecting the difference of s-wave scattering phase shifts,…
Evaluation of Doppler Shifts to Improve the Accuracy of Primary Atomic Fountain Clocks
Jocelyne Guéna, Ruoxin Li, Kurt Gibble +2
We demonstrate agreement between measurements and ab initio calculations of the frequency shifts caused by distributed cavity phase variations in the microwave cavity of a primary…
Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts
Ruoxin Li, Kurt Gibble, Krzysztof Szymaniec
We evaluate the distributed cavity phase and microwave lensing frequency shifts, which were the two largest sources of uncertainty for the NPL-CsF2 cesium fountain clock. We report…
Clock-line-mediated Sisyphus Cooling
Chun-Chia Chen, Jacob L. Siegel, Benjamin D. Hunt +6
We demonstrate sub-recoil Sisyphus cooling using the long-lived clock state in alkaline-earth-like ytterbium. A 1388 nm optical standing wave nearly resonant w…