Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E01: Prize Session: Deborah Jin Thesis AwardInvited Live Prize/Award
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Chair: Scott Bergeson, BYU |
Tuesday, June 1, 2021 2:00PM - 2:30PM Live |
E01.00001: Deborah Jin Award for Outstanding Doctoral Thesis Research in Atomic, Molecular, or Optical Physics Recipient: Ultracold Molecules in Optical Arrays: From Laser Cooling to Molecular Collisions Invited Speaker: Loic Anderegg Molecules, with potential wide-ranging scientific applications due to their strong, tunable long-range interactions, and complex internal structure, have led to significant efforts in controlling them at the single quantum state level. Both bi-alkali molecules, assembled from ultracold atoms and direct laser cooling of molecules have played a key role in this effort. In this talk, I will describe the progress of laser cooling of molecules spanning ten orders of magnitude in phase space density. Starting with an RF MOT of CaF molecules, we explore new techniques to optically trap, cool, and image molecules with high fidelity. I will describe the development of an optical tweezer array of CaF molecules, a powerful platform offering the possibility of high-fidelity readout and control of both individual molecules as well as systems. We implement internal quantum state control of the molecules and dynamical control of the tweezers to build a platform for exploring state-selective ultracold collisions. With the ability to load single molecules into tweezers arrays, molecules are, for the first time, on an equal footing with laser cooled atoms. |
Tuesday, June 1, 2021 2:30PM - 3:00PM Live |
E01.00002: FINALIST: QED tests and fundamental constants from frequency comb spectroscopy on hydrogen and deuterium Invited Speaker: Alexey Grinin Current calculations and experiments on quantum electrodynamics (QED) both achieve twelve digits of accuracy [1] making it an excellent test ground of the fundamental physics |
Tuesday, June 1, 2021 3:00PM - 3:30PM Live |
E01.00003: FINALIST: Engineering and Imaging Nonlocal Spin Dynamics in an Optical Cavity Invited Speaker: Emily J Davis Photon-mediated interactions between atoms coupled to an optical cavity are a powerful tool for engineering entangled states and many-body Hamiltonians. These applications motivate the construction of an optical cavity enabling coherent nonlocal spin interactions, with transverse optical access for high-resolution imaging and addressing of atomic sub-ensembles. Using this apparatus, we implement a nonlocal Heisenberg Hamiltonian, where the relative strength and sign of spin-exchange and Ising couplings are controllable parameters. This tunability enables the demonstration of an interaction-induced protection of spin coherence against single-atom dephasing terms. The optical access afforded by a near-concentric cavity facilitates local control and imaging of the magnetization for Hamiltonian tomography and spatially resolved detection of the spin coherence. Imaging also allows for the first observation of cavity-mediated spin mixing in a spin-1 system, a new mechanism for generating correlated atom pairs. Whereas the single-mode cavity most naturally mediates all-to-all couplings, I will also discuss progress in generalizing to control the distance-dependence of the interactions, with prospects in engineering the spatial structure of entanglement. I furthermore propose and analyze two specific protocols in quantum control enabled by strong and tunable atom-light interactions. I first introduce a protocol that enables entanglement-enhanced measurements near the Heisenberg limit while reducing technical requirements on detection. This is accomplished via an interaction-enhanced readout that relies on reversing the sign of global Ising interactions. Dispersive atom-light interactions also enable heralded schemes, in which a high-fidelity pure state is produced upon probabilistic detection of a single photon. In this context, I show how a time-shaped single-photon pulse can ``paint'' an arbitrary superposition of coherent spin states while avoiding infidelities due to finite cavity linewidth. |
Tuesday, June 1, 2021 3:30PM - 4:00PM Live |
E01.00004: FINALIST: Probing TeV Physics with the ThO Molecule: Twelve-fold Improved Measurement of the Electron's EDM Invited Speaker: Cristian D Panda The Standard Model of particle physics accurately describes with amazing precision all particle physics measurements made in the laboratory. However, it is unable to answer basic cosmological questions, such as the nature of dark matter and why matter dominates over antimatter throughout the universe. New theories, such as models incorporating supersymmetry, contain massive particles whose interactions violate time-reversal symmetry, giving rise to an electric dipole moment (EDM) along the spin axis of the electron. In this talk, I will describe a new measurement of the electron's electric dipole moment, $d_e$=$(4.3 \pm 3.1_\mathrm{stat} \pm 2.6_\mathrm{syst})\times 10^{-30}$ $e \cdot \textrm{cm}$, obtained by measuring the spin precession of electrons subjected to the huge intramolecular electric field (78 GV/cm) accessible in the thorium monoxide (ThO) molecule. The resulting upper limit, $|d_e|<1.1\times 10^{-29}$~$e\cdot \textrm{cm}$, sets very strong constraints on the existence of new particles with masses far beyond the direct reach of the Large Hadron Collider. The sensitivity of our measurement, one order of magnitude better than any previous work, was made possible by sweeping technical improvements in our apparatus, such as increased state preparation efficiency that comes from introducing stimulated Raman adiabatic passage (STIRAP), and control and reduction of systematic effects. Future improvements in the search for EDMs using atoms and molecules promise to further advance the quest to find the new physics beyond the Standard Model that will help make it accurately describe our universe. |
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