Bulletin of the American Physical Society
50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019; Milwaukee, Wisconsin
Session Q06: Controlling Interacting Atoms in Optical Tweezers |
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Chair: Doerte Blume, University of Oklahoma Room: Wisconsin Center 102DE |
Thursday, May 30, 2019 2:00PM - 2:30PM |
Q06.00001: Quantum Optics with Ultracold Fermions Invited Speaker: Philipp Preiss Control over individual particles has recently enabled the observation of quantum optics phenomena in ultracold atom experiments. In this talk, I will show how to realize entangled-pair sources of massive particles. Using optical tweezers, we implement deterministic sources of lithium atoms in a setting where spins and momenta of individual particles can be detected via free-space fluorescence imaging. In contrast to all photonic implementations, the source operates on fermionic particles, allowing us to explore coherence, many-body interference, and entanglement in a system with negative exchange symmetry. We verify the indistinguishability of the particles through Hanbury Brown-Twiss experiments, in which we detect high-contrast second-order interference and strong correlations at third order. Switching on interactions between the particles, we obtain maximally entangled pairs, which may be used to probe the violation of a CHSH inequality in the experiment. In the future, our techniques may help to measure coherence properties of small atomic clusters and order parameters of fermionic superfluids. [Preview Abstract] |
Thursday, May 30, 2019 2:30PM - 3:00PM |
Q06.00002: Density oscillations induced by individual ultracold two-body collision Invited Speaker: Qingze Guan Access to single particle momenta provides new means of studying the dynamics of few interacting particles. In a joint theoretical and experimental effort, we observe and analyze the effects of a finite number of ultracold two-body collisions on the relative and single-particle densities by quenching two ultracold atoms with initial narrow wave packet into a wide trap with inverted aspect ratio. The experimentally observed spatial oscillations of the relative density are reproduced by a parameter-free zero-range theory and interpreted in terms of cross-dimensional flux. We theoretically study the long time dynamics and find that the system does not approach its thermodynamic limit. The set-up can be viewed as an advanced particle-collider that allows one to watch the collision process itself. [Preview Abstract] |
Thursday, May 30, 2019 3:00PM - 3:30PM |
Q06.00003: Microscopic control and detection of ultracold strontium for many-body physics and metrology Invited Speaker: Adam Kaufman Microscopic control and detection of ensembles of neutral atoms have transformed our ability to study complex many-body systems. Techniques like quantum gas microscopy and optical tweezers grant a new single-particle-resolved perspective on solid-state analogs and idealized quantum spin models, as well as altogether novel detection capabilities for fundamentally quantum quantities like entanglement. In this talk, I will describe our group's progress towards developing these tools for a new atomic species, strontium. In doing so, we establish new prospects for applying these microscopic control techniques to states of matter, like quantum spin liquids, that are enabled by alkaline-earth atoms, along with quantum-information-processing architectures that exploit the rich internal degrees-of-freedom of this species. Importantly, our work also demonstrates a new direction for these tools of microscopic control --- neutral-atom optical clocks --- a marriage which has a number of strengths for metrology. To this end, I will report also our recent results of Hz-scale coherence and repeated atomic interrogation, which are directed towards the development of a high-duty cycle tweezer-array clock. ~~~ [Preview Abstract] |
Thursday, May 30, 2019 3:30PM - 4:00PM |
Q06.00004: Interaction driven dynamics of few atoms in an optical tweezer Invited Speaker: Mikkel Andersen An enduring ambition in atomic physics is to build an understanding of interacting macroscopic systems from knowledge of the underlying microscopic dynamics. We use a bottom-up approach to assemble individual few-atom systems in an optical micro-tweezer and study their dynamics. This allows for interrogation of atoms with collisional properties that are unfavorable for many-body experiments as well as direct observation of effects that get hidden by ensemble averaging. The talk will focus on our recent studies of spin-dynamics of two thermal spin-two atoms undergoing spin-changing collisions in the optical tweezer . We see that the it leaves the magnetic sub-levels of the atoms strongly correlated with relative number fluctuations 11.9 dB below quantum shot noise. The spin populations display relaxation dynamics contrary to the coherent spin waves witnessed in finite-temperature many-body experiments and zero-temperature two-body experiments. The observed dynamics may provide a route for thermally robust entanglement generation. In an experiment with a cold Rb-85 triad we observe three-body recombination. Our ability to directly observe the number of atoms remaining after individual loss events allows us to discriminate between one- two- and three-body loss events. We confirm that three-body recombination leads to all three atoms being lost. However, we also observe that the three-body recombination rate is strongly suppressed relative to the expected rate for non-interacting atoms. This could indicate that interactions between the atoms induces correlations that suppress three-body recombination despite Rb-85 having effective attractive interactions with a negative scattering length. [Preview Abstract] |
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