Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D69: Molecular Quantum MatterInvited
|
Hide Abstracts |
Sponsoring Units: DAMOP Chair: Cheng Chin, University of Chicago Room: Room 421 |
Monday, March 6, 2023 3:00PM - 3:36PM |
D69.00001: Many-body Chemical Reactions in a Quantum Degenerate Gas Invited Speaker: Zhendong Zhang Chemical reactions in the quantum degenerate regime are described by mixing of matterwave fields. Quantum coherence and bosonic enhancement are two unique features of many-body reactions involving bosonic reactants and products. Such collective reactions of chemicals, dubbed "super-chemistry", is an elusive goal in quantum chemistry research. Here we report the observation of coherent and collective reactive coupling between Bose condensed atoms and molecules near a Feshbach resonance. Starting from an atomic condensate, the reaction begins with a rapid formation of molecules, followed by oscillations of their populations in the equilibration process. Faster oscillations are observed in samples with higher densities, indicating bosonic enhancement. We present a quantum field model which describes the dynamics well and identifies three-body recombination as the dominant reaction process. Our findings exemplify the highly sought-after quantum many-body chemistry and offer a new paradigm for the control of quantum chemical reactions. |
Monday, March 6, 2023 3:36PM - 4:12PM |
D69.00002: From Microwave Shielding to Field-Linked Resonances Invited Speaker: Andreas Schindewolf Very recently two types of resonances were found that allow to tune the contact interaction of dipolar molecules and open up the possibility to form ultracold tetramer molecules. While the Ketterle group observed Feshbach resonances of triplet ground-state molecules at MIT [1], I report here about so-called field-linked resonances of singlet ground-state molecules [2]. Field-linked resonances had already been predicted 20 years ago by John Bohn's group [3]. We* now realized them by shaping the long-range intermolecular potential that is induced by a microwave field for microwave shielding [4-7]. By tuning the parameters of the microwave field (polarization, intensity, and detuning from the rotational transition) we can engineer a potential well that is deep enough to house field-linked bound-states, which give rise to the resonances. The coexistence of large dipole-dipole interaction and tunable contact interaction in the vicinity of the field-linked resonances enables the investigation of novel kinds of dipolar superfluids and supersolids. |
Monday, March 6, 2023 4:12PM - 4:48PM |
D69.00003: Molecular Quantum Matter Invited Speaker: Sebastian Will It has been a long quest in ultracold quantum science to realize many-body systems with strong and tunable long-range interactions that reach beyond the typical contact interactions of ultracold atoms. In this talk, I will report on recent advances from our lab that have led to the creation of ultracold gases of dipolar NaCs molecules [1-3]. NaCs is a bosonic molecule with a large dipole moment (4.6 Debye). The resulting dipolar interactions are highly controllable and allow us to reach an effective interaction range that is significantly larger than typical interparticle spacings, giving us access deep into the strongly interacting regime. I will report on microwave shielding in NaCs, a technique that protects molecules from lossy inelastic collisions and increases the lifetime of our molecular samples by more than a factor of 100. We now observe lifetimes on the scale of one second, which makes ultracold gases of NaCs a "fully usable" quantum liquid. This new form of dipolar quantum matter presents us with a wide range of opportunities to study new emergent quantum phases in 2D (quantum crystals, supersolidity, hexatic phases), realize extended Hubbard models (including Mott insulators with fractional filling), and open up new avenues for quantum simulation of frustrated spin systems. |
Monday, March 6, 2023 4:48PM - 5:24PM |
D69.00004: Spin-Exchange Interactions and On-Demand Entanglement of Laser-cooled Molecules in an Optical Tweezer Array Invited Speaker: Lawrence W Cheuk Molecules, with their rich structure and tunable long-range interactions, have been proposed as a versatile platform for quantum science. In this talk, I will report on recent advances from our group on manipulating and controlling individual laser-cooled molecules. In particular, I will report on observations of coherent spin-exchange interactions between individual CaF molecules trapped in a reconfigurable optical tweezer array. Using spin-exchange interactions, we also implement a 2-qubit iSWAP gate to create entangled Bell pairs of molecules on-demand. Our results pave the way for quantum information processing and quantum simulation using molecular tweezer arrays. For quantum information, the iSWAP gate, combined with local control available in optical tweezer experiments, allow for universal quantum computing with molecular qubits. For quantum simulation, spin-exchange interactions form the building block for realizing a variety of quantum spin models. Together with microscopic readout, control, and the ability to create arbitrary trapping geometries, molecular tweezer arrays could be a powerful new platform to study these models in a bottom-up approach. |
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