Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session U2: Hot TopicsInvited
|
Hide Abstracts |
Chair: Bob Jones, University of Virginia Room: 306-307 |
Friday, June 9, 2017 10:30AM - 11:00AM |
U2.00001: Quantum acoustics with superconducting qubits Invited Speaker: Yiwen Chu The ability to engineer and manipulate different types of quantum mechanical objects allows us to take advantage of their unique properties and create useful hybrid technologies. Thus far, complex quantum states and exquisite quantum control have been demonstrated in systems ranging from trapped ions to superconducting resonators. Recently, there have been many efforts to extend these demonstrations to the motion of complex, macroscopic objects. These mechanical objects have important applications as quantum memories or transducers for measuring and connecting different types of quantum systems. In particular, there have been a few experiments that couple motion to nonlinear quantum objects such as superconducting qubits. This opens up the possibility of creating, storing, and manipulating non-Gaussian quantum states in mechanical degrees of freedom. However, before sophisticated quantum control of mechanical motion can be achieved, we must realize systems with long coherence times while maintaining a sufficient interaction strength. These systems should be implemented in a simple and robust manner that allows for increasing complexity and scalability in the future. In this talk, I will describe our recent experiments demonstrating a high frequency bulk acoustic wave resonator that is strongly coupled to a superconducting qubit using piezoelectric transduction. In contrast to previous experiments with qubit-mechanical systems, our device requires only simple fabrication methods, extends coherence times to many microseconds, and provides controllable access to a multitude of phonon modes. We use this system to demonstrate basic quantum operations on the coupled qubit-phonon system. Straightforward improvements to the current device will allow for advanced protocols analogous to what has been shown in optical and microwave resonators, resulting in a novel resource for implementing hybrid quantum technologies. [Preview Abstract] |
Friday, June 9, 2017 11:00AM - 11:30AM |
U2.00002: Laser cooling of SrOH and magneto-optical trapping of CaF Invited Speaker: John Doyle Several promising goals of modern quantum science will be aided by the extension of precision control beyond atoms and bi-alkali molecules to a diverse set of molecular species with varying complex internal structures. Direct laser cooling and trapping of molecules is one promising route. For example, diatomic molecules with one or more unpaired electron spins and polyatomic molecules with closely spaced opposite parity levels have features advantageous for quantum simulation and precision measurement. Frontier research goals include the creation of new types of ultracold quantum molecular gases, optically trapped samples of molecules that can be read out and addressed individually, and new molecules for searches for particle physics beyond the standard model.\\ \\Toward this goal, we have recently demonstrated laser slowing and magneto-optical trapping of CaF. Using a two stage cryogenic buffer-gas beam (CBGB) and white light slowing, more than 10,000 molecules are loaded and trapped in a MOT with a temperature below 10 mK. We create a `dual frequency' DC MOT as also demonstrated in [1] and compare its properties to a RF MOT previously achieved with SrF [2]. We will present our most recent progress with CaF.\\ \\We have also recently demonstrated laser cooling of SrOH, a molecule whose structure illuminates some of the possibilities of ultracold polyatomic molecules. With three distinct vibrational modes, SrOH can be optically prepared in excited vibrational states resulting in nearly degenerate opposite parity levels that can be easily mixed in small electric fields. Using optical cycling, we have demonstrated Doppler and Sisyphus laser cooling of this polyatomic radical. By re-pumping the molecules that decay to the excited Sr-O stretching and bending modes, we reduce the transverse temperature of molecular beam from 50 mK to below 1 mK in one dimension. We will also present other recent work on SrOH. Our approach could be applied to more complex species like SrOCH$_{3}$ and SrOCH$_{2}$CH$_{3}$, opening a path toward creating a variety of ultracold polyatomic molecules by means of direct laser cooling.\\ \\$[1]$ Truppe \textit{et al}., arXiv:1703.00580 (2017). [2] Norrgard \textit{et al}., Phys. Rev. Lett. 116, 063004 (2016). [Preview Abstract] |
Friday, June 9, 2017 11:30AM - 12:00PM |
U2.00003: Experimental Constraint on Dark Matter-Standard Model Coupling with Optical Atomic Clocks Invited Speaker: Michal Zawada All the evidence for existence of the dark matter (DM) comes from astrophysical observations at the galaxy scale. The nature of the DM composition, however, will be known only after the positive detection of the DM candidates. The nonbaryonic DM is most probably described by fields not yet included in the standard model. The viable cold DM particles candidates, axions, WIMPs, super- WIMPs, require existence of fields which can be coupled to the standard model fields. Therefore, existing experiments focus on searches for such couplings. Unfortunately, no experimental data proved any positive detection. E.g., the LUX experiment, which studied potential coupling between WIMPs and nucleons, reported recently constraints on the scattering cross section per nucleon below 10−45 cm2 . Lack of any detected DM in the form of particles yielded alternative theories, such as oscillating massive scalar fields or topological defects in the scalar fields. Recently, we have shown that a single optical atomic clock can be used as a detector for the DM in the form of stable topological defects. We exploited differences in the susceptibilities to the fine structure constant of essential parts of an optical atomic clock, i.e. the atoms and the cavity. With a system of two strontium optical lattice clocks we performed an experiment which constrained the strength of atomic coupling to hypothetical DM cosmic objects. Under the conditions of our experiment, the degree of constraint was found to exceed the previously reported limits by more than three orders of magnitude. [Preview Abstract] |
Friday, June 9, 2017 12:00PM - 12:30PM |
U2.00004: Microscopy of atomic Fermi-Hubbard systems in new regimes Invited Speaker: Waseem A. Bakr The ability to probe and manipulate ultracold fermions in optical lattices at the atomic level using quantum gas microscopes has enabled quantitative studies of Fermi-Hubbard models in a temperature regime that is challenging for state-of-the-art numerical simulations. Experiments have focused on spin-balanced gases of repulsively interacting atoms with the hope of elucidating phenomena in the high-temperature superconductors. In this talk, I will present experiments that explore the Hubbard model in two new regimes: repulsive gases with spin-imbalance and attractive spin-balanced gases. In the first regime, we observe canted antiferromagnetism at half-filling, with stronger correlations in the direction orthogonal to the magnetization. Away from half-filling, the polarization of the gas exhibits non-monotonic behavior with doping, resembling the behavior of the magnetic susceptibility of the cuprates. The attractive Hubbard model studied in the second set of experiments is the simplest theoretical model for studying pairing and superconductivity of fermions in a lattice. Our measurements on the normal state reveal checkerboard charge-density wave correlations close to half-filling. Compared to the paired atom fraction, we find the charge-density-wave correlations to be a much more sensitive thermometer in the low temperature regime relevant for future studies of inhomogeneous superfluid phases in spin-imbalanced attractive gases. [Preview Abstract] |
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. |
© 2024 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