Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session X03: New Physics Searches with Precision MeasurementsInvited Live Streamed
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Chair: John Bohn, University of Colorado, Boulder Room: Ballroom 111 B |
Friday, June 9, 2023 8:00AM - 8:30AM |
X03.00001: Testing local position invariance with atom interferometry Invited Speaker: Fabio Di Pumpo Tests of local position invariance (LPI) with atom interferometers have gained considerable attention as a fundamental verification of the Einstein equivalence principle. So far, these discussions mainly focused on the universality of gravitational redshift (UGR), one of the two facets of LPI. Although UGR can be tested with spatially delocalized quantum-clock interferometry based on atom interferometers, such tests fall significantly short relative to conventional clock-based tests due to their limited duration and spatial separation. However, LPI manifests also via the universality of clock rates (UCR), predicting that two different clocks at the same height measure the same proper time. We show that whereas UCR tests in a fountain-clock Ramsey sequence are limited by initial conditions, quantum-clock interferometers with a cubic scaling in time circumvent this shortcoming. These schemes can be operated with optical frequencies and are robust against several parasitic effects. Since UCR is independent of spatial separations, the most prominent advantage of conventional clocks does not apply. We discuss different implementations which may outperform current UCR tests with fountain clocks. |
Friday, June 9, 2023 8:30AM - 9:00AM |
X03.00002: New Measurement of the Electron Magnetic Moment and a New Dark Photon Limit Invited Speaker: Gerald Gabrielse A one-electron quantum cyclotron, quantum mon-demolition (QND) detection, inhibited spontaneous emission, a split dilution refrigerator, and a self-shielded superconducting solenoid have been used to measure the electron's magnetic moment. This most precise determination of a property of an elementary particle, to 1.3 parts in 10^{13}, was made to text the most precise prediction of the Standard Model of Particle Physics (SM). In the most precise confrontation of theory and measurement, the SM prediction agrees with what we measure to 1 part in 10^{12}. BSM (beyond the SM) particles and electron substructure could make the measurement and prediction differ (like quark substructure shifts the proton moment). The measurement precision will allow a much better SM test once discrepant measurements of the fine structure constant are resolved. |
Friday, June 9, 2023 9:00AM - 9:30AM |
X03.00003: Measurement of the Electric Dipole Moment of 171Yb Atoms in an Optical Dipole Trap Invited Speaker: Zheng-Tian Lu The permanent electric dipole moment (EDM) of the 171Yb (I = 1/2) atom is measured with atoms held in an optical dipole trap (ODT). By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a QND measurement with a spin-state-detection efficiency of 50% is realized. A systematic effect due to parity mixing induced by a static E field is observed, and is suppressed by averaging between measurements with ODTs in opposite directions. The coherent spin precession time is found to be much longer than 300 s. The EDM is determined to be less than 1.5 x 10-26 e·cm (95% C.L.). These measurement techniques can be adapted to search for the EDM of 225Ra. |
Friday, June 9, 2023 9:30AM - 10:00AM |
X03.00004: Testing quantum theory on curved space-time with quantum networks and proper time interference Invited Speaker: Igor Pikovski Gravitational time dilation is well tested with atomics clocks. The remarkable precision allows for the verification of this general relativistic effect at mm-scales. However, in all experiments to date the proper time is a classical parameter along classical world-lines of the clocks. Here I will discuss superpositions of proper time and how they affect matter-wave systems in novel ways. I will then extend the analysis to entangled states and show how an experiment with entangled clocks can verify proper time superpositions. This opens the possibility to probe quantum theory on curved space-time for the first time in near future experiments. |
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