Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session H04: Experiment: Spectroscopy Lifetimes & Oscillator StrengthsRecordings Available
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Chair: Wes Campbell, UCLA Room: Salon 3/4 |
Wednesday, June 1, 2022 8:00AM - 8:12AM Withdrawn |
H04.00001: Measurement of a blue magic wavelength for the fermionic-strontium clock transition Tyler Goodman, Paul Lauria, Elias Trapp, Julio T Barreiro State-insensitive optical traps of neutral atoms offer a platform for precision metrology and quantum simulation. These traps are created using magic wavelengths of light, which uniformly shift the energy levels of two atomic states throughout the trap and preserve the transition frequency. Strontium has been shown to have a magic wavelength at 813.4 nm for its clock transition, and has been successfully used in arrays of bosonic optical-clock tweezers. We measure a new theoretically-predicted magic wavelength around 497 nm for this clock transition. This new blue-regime magic wavelength has five times the polarizability, and allows for smaller spot sizes. Our measurement also aids in the determination of excited state transition matrix elements and their effects on the clock transition. This new magic wavelength will facilitate our creation of more closely spaced 2D optical fermionic tweezer arrays, enabling new experiments with entangled tweezer clocks and condensed-matter simulations. |
Wednesday, June 1, 2022 8:12AM - 8:24AM |
H04.00002: Magic wavelengths of 88Sr intercombination transition for interfacing with optical ring resonators Grady Kestler, Khang Ton, Dmytro Filin, Marianna Safronova, Julio T Barreiro Intrinsic properties of strontium-88 atoms make it a strong candidate for future atomtronic applications. Aluminum nitride optical ring resonators offer a practical platform to interface light with strontium atoms due to their ultra-high Q factors and large evanescent fields nearby the dominant 461-nm atomic transition. Finely tuned intensities of 400-500-nm attractive and repulsive wavelengths can generate trapping wells hundreds of nanometers away from the device surface. When loading from the magneto-optical trap (MOT), the evanescent fields can cause position- and level-dependent energy shifts on the atoms, thus detuning their spectrum from the MOT cooling transition and reducing trap loading efficiencies. However, utilizing attractive and repulsive magic wavelength traps of the narrow-line cooling transition can mitigate this effect and improve loading efficiencies. Here, we present spectroscopic measurements of an attractive magic wavelength of 88Sr at 473.117(15) nm and a theoretically predicted repulsive magic wavelength at 435.825 nm. Various optical ring resonator designs with high Q factors at these wavelengths provide viable platforms for interfacing strontium with nanophotonic chips. |
Wednesday, June 1, 2022 8:24AM - 8:36AM |
H04.00003: Measurement of the 87Rb D-line vector tune-out wavelength Cass A Sackett, Adam Fallon, Edward R Moan, Elizabeth A Larson A tune-out wavelength characterizes a zero in the electric polarizability of the atom, such that the atom experiences no first-order energy shift in the presence of the light. Tune-out wavelength measurements are useful for experiments involving multiple species, and for providing precise constraints on the electric dipole moments of the atom. The location of a tune-out wavelength depends in general on the polarization state of the light, and this dependence is characterized by the vector polarizability. To date, precise measurements have focused on the polarization-independent scalar polarizability, but we report here a vector measurement using circularly polarized light. For an estimated polarization purity of 0.9931(1), we find a tune-out wavelength for 87Rb at 785.1522(3) nm. The experimental result agrees with theoretical expectations when small contributions from the core electrons and off-resonant alence states are taken into account. This type of measurement can provide information about the dipole matrix elements which is particularly applicable to the interpretation of atomic parity violation experiments. |
Wednesday, June 1, 2022 8:36AM - 8:48AM |
H04.00004: Spectroscopy of Metastable Trapped 173Yb+ for quantum information and fundamental science Thomas Dellaert, Patrick J McMillin, Wesley C Campbell, Hassan Farhat, Conrad H Roman The metastable 2Fo7/2 state in 171Yb+ is increasingly being utilized as a resource for quantum information processing, but the more complex (and potentially more useful) hyperfine structure of this state for the deformed-nucleus ytterbium-173 isotope is experimentally unexplored. Predictions, however, point to unique aspects of the hyperfine interaction in this case, including hyperfine quenching of the metastable state lifetime to a technologically attractive level [Dzuba et al. 2018] and the potential to resolve a 4 orders of magnitude discrepancy in the nuclear magnetic octupole moment of ytterbium-173 [Xiao et al. 2019, de Groote et al. 2020]. We present new measurements of the hyperfine structure in 173Yb+ and progress toward achieving Hz-level accuracy of the splittings in the 2Fo7/2 state. |
Wednesday, June 1, 2022 8:48AM - 9:00AM |
H04.00005: High-resolution laser-induced fluorescence spectroscopy of 28Si16O+ and 29Si16O+ in a cryogenic buffer-gas cell Guanming Lao, Guo-Zhu Zhu, Clayton Ho, Wesley C Campbell, Eric R Hudson Optical cycling has been successfully applied in many fields of atomic research, including laser cooling, atom trapping and quantum information, and therefore inspires the extension to molecular systems, such as SrF, CaF, YbF, YO, SrOH, CaOH, YbOH and CaOCH3. However, few experiments have been done on molecular ions while several candidates have been proposed, including SiO+, BH+, AlH+, AlCl+, BO+, PN+ and YF+. 28Si16O+, one of the most promising candidates, is found to have a highly vibrationless decay for the B2Σ+ → X2Σ+ transition and has been rotationally cooled by the Odom group. In this work, we investigate the suitability of hosting a hyperfine qubit in its isotopologue, 29Si16O+. We have carried out the high-resolution laser-induced fluorescence spectroscopy of 29Si16O+ and 28Si16O+ in a cryogenic buffer-gas cell at around 90 K and obtained the corresponding rotational and hyperfine constants. The quantum logic operations using the hyperfine structures of 29Si16O+ are discussed and an electric field gradient gate (EGG) is proposed. Simulations indicate that the fidelity of the two-qubit gate is >0.99 with the gate time on the order of a few milliseconds. Our results show that 29Si16O+ has great potential in quantum information science. |
Wednesday, June 1, 2022 9:00AM - 9:12AM |
H04.00006: High resolution continuous wave spectroscopy of the A 2Σ+ ← X 2Π3/2 transition in nitric oxide Fabian Munkes, Patrick Kaspar, Philipp Neufeld, Lea Ebel, Yannick Schellander, Robert Loew, Tilman Pfau, Harald Kuebler Within the scope of the development of a new kind of gas sensor [1,2], we employ Doppler-free saturated absorption spectroscopy on the A 2Σ+ ← X 2Π3/2 transition in nitric oxide (NO) for different total angular momenta J on the P12 branch. Spectroscopy is performed in continuous wave operation at 226 nm in a 50 cm long through-flow cell. Via phase sensitive detection by a lock-in amplifier the hyperfine structure of the X 2Π3/2 state of NO is partially resolved. The data is compared to previous measurements [3], showing good agreement. Investigation of the dependence of the spectroscopic feature on power and pressure, should yield hyperfine constants, natural transition linewidth and the collisional cross-section between NO molecules. |
Wednesday, June 1, 2022 9:12AM - 9:24AM |
H04.00007: Molecular "vapor cell'' in a beaker Changling Zhao, Ashley Shin, Claire Dickerson, Barry Li, Yi Shen, Paula Diaconescu, Justin R Caram, Wesley C Campbell The fundamental sensitivity limit of a vapor cell magnetometer is constrained by the number of spins participating in the measurement, but there is a cap to the number density that gas phase systems can reach before spin-exchange collisions and radiation trapping become a problem. As an extrapolation of high density buffer gas, liquid systems can potentially take advantage of the extremely high number density (2t×1019/cc) of spins achievable in solution. Here we present a Yb3+ based molecular complex ((thiolfan)YbCl) that has an isolated, narrow, optical transition even when dissolved in solution at room temperature. We characterize the magnetic sensitivity of the transition via Zeeman splitting, demonstrating the potential application of (thiolfan)YbCl for magnetic sensing. We also report our current progress on spectral hole burning and optical state preparation and readout of ground state coherence in this liquid molecular system. |
Wednesday, June 1, 2022 9:24AM - 9:36AM |
H04.00008: Spectroscopy of heteronuclear xenon-noble gas mixtures - Toward Bose-Einstein condensation of vacuum-ultraviolet photons Thilo Falk vom Hoevel, Eric Boltersdorf, Frank Vewinger, Martin Weitz In the vacuum-ultraviolet regime (VUV, 100 - 200 nm), realizing lasers is difficult, as excited state lifetimes scale as 1/ω3, resulting in the need of high pump powers for population inversion. We propose an experimental approach for the realization of a coherent light source in the VUV based on Bose-Einstein condensation of photons. In our group, Bose-Einstein condensation of visible photons is investigated using liquid dye solutions as thermalization media in wavelength-sized optical microcavities, the latter providing a non-trivial energy ground state the photons can condense into. |
Wednesday, June 1, 2022 9:36AM - 9:48AM |
H04.00009: Excitation of magnetic dipole transition of Thulium atoms trapped in rare gas crystals Vinod Gaire, Colin V Parker, Chandra Raman, Jianqiao Li, Yiting Pei We performed single-laser direct excitation of the magnetic dipole transition of the ground state (2F7/2 ↔2F5/2) of 169Tm atoms trapped in solid argon and neon and performed absorption and emission spectroscopy. The transition is split into multiple components, likely due to the crystal field effects of the host. With improved FTIR and absorption spectroscopy, a number of narrow linewidth features were resolved. We demonstrate sufficient driving amplitude to saturate the transition and find no evidence of inhomogeneous line broadening. This supports a picture where the linewidth (as narrow as 1.5 GHz) is determined by homogeneous broadening from photons, which is also supported by an observed temperature dependence. We will present the results from spectroscopy and attempts to assign features to specific transitions. |
Wednesday, June 1, 2022 9:48AM - 10:00AM |
H04.00010: An improved measurement of the ground state tensor polarizability of Cesium atoms Zhenyu Wei, Teng Zhang, David S Weiss We will present the first precision measurement of the ground state tensor polarizability (GSTP) of the Cs F=3 hyperfine level. The GSTP provides a way to test third order atomic calculations, similar to those used to extract the weak charge from atomic parity violation measurements. The Cs atoms are laser cooled and trapped in a 1D optical lattice in a magnetically shielded region, then prepared with equal populations in the stretched states |mF=±3>. The GSTP is measured by simultaneously driving the |mF=±3>→ |mF=±2> transitions in a large electric field. We have demonstrated a relative precision of ~5×10-4, nearly two orders of magnitude more precise than previous experimental and theoretical results for the F=4 hyperfine level. Our precision suggests the future ability to measure the difference between the GSTP of different hyperfine levels, which is sensitive to electric quadrupole interactions. We will discuss our work to ensure against systematic errors, which we expect to end up at about the 5×10-4 level. |
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