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 U03: Searches for New Physics (GPMFC)Invited Session Live Streamed
|
Hide Abstracts |
Chair: Paul Hamilton, UCLA Room: Grand Ballroom B |
Thursday, June 2, 2022 2:00PM - 2:30PM |
U03.00001: Searches for new physics with Yb+ optical clocks Invited Speaker: Nils Huntemann Besides the use of optical clocks in metrology, comparisons of these clocks enable searches for violations of the Einstein equivalence principle. The 171Yb+ optical clock that is based on electric octupole (E3) transition possesses a favorable combination of small systematic uncertainty and high sensitivity for such tests because of the strongly relativistic character of the excited 2F7/2 state. A comparison of two Yb+(E3) clocks with 4 x 10-18 uncertainty provides stringent limits on Lorentz symmetry violation parameters for electrons [1]. Further improvements can be expected from experiments in which the Lorentz violating energy at the millihertz-level or below can be determined without a 642 THz clock frequency offset. Here, we concentrate on spectroscopy of the hyperfine structure of the 2F7/2 state using microwave radiation enabling seconds long coherence times. These investigations make use of the extraordinary long lifetime of the 2F7/2 level which we measure with a new method as 1.58(8) years [2]. |
Thursday, June 2, 2022 2:30PM - 3:00PM |
U03.00002: The BeEST Experiment: Searching for Sterile Neutrinos in 7Be Decay with Superconducting Tunnel Junctions Invited Speaker: Kyle G Leach The search for sterile neutrinos is among the brightest possibilities in our quest for understanding the microscopic nature of dark matter in our universe. Sterile neutrinos - unlike the active neutrinos in the Standard Model (SM) - do not interact with normal matter as they move through space, and their existence is best probed via momentum conservation with SM particles in radioactive decay. One way to observe these momentum recoil effects experimentally is through high-precision measurements of electron-capture (EC) nuclear decay, where the final state only contains the neutrino and a recoiling atom. This approach is a powerful method for "new physics" searches searches since it relies only on the existence of a heavy neutrino admixture to the active neutrinos - a generic feature of neutrino mass mechanisms - and not on the model-dependent details of their interactions. The BeEST experiment precisely measures the eV-scale radiation that follows the decay of 7Be ions implanted into sensitive superconducting tunnel junction (STJ) quantum sensors, and currently sets the best laboratory limits on the existence of these heavy neutral leptons in the 100 - 860 keV mass region. |
Thursday, June 2, 2022 3:00PM - 3:30PM |
U03.00003: Using spins to search for dark matter and test linearity of quantum evolution Invited Speaker: Alexander Sushkov Ensembles of electron and nuclear spins have found applications in a number of precision experiments, such as SHAFT and CASPEr, that search for ultralight dark matter. I will describe the new limits, placed by these experiments on all three possible interactions of axion-like dark matter. We also use this precision-measurement approach to experimentally search for causal non-linear state-dependent terms in quantum field theory. Our apparatus correlates a binary macroscopic classical voltage with the outcome of a projective measurement of a quantum bit, prepared in a coherent superposition state. Measurement results are recorded in a bit string, which is used to control a voltage switch. The presence of a non-zero voltage reading in cases of no applied voltage is the experimental signature of a non-linear state-dependent shift of the electromagnetic field operator. We implement blinded measurement and data analysis with three control bit strings. Control of systematic effects is realized by producing one of the control bit strings with a classical random-bit generator. Our measurements find no evidence for electromagnetic quantum state-dependent non-linearity. We set an upper bound on the parameter that quantifies this non-linearity: |εγ| < 4.7 × 10-11, at 90% confidence level. |
Thursday, June 2, 2022 3:30PM - 4:00PM Withdrawn |
U03.00004: Is Spacetime Pixellated? Invited Speaker: Kathryn Zurek We discuss the theoretical case to search for signatures of quantum gravity in tabletop interferometers. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2025 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700