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 U10: Focus Session: Rydberg Atoms and Molecules and their InteractionsFocus Live Streamed
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Chair: Dan Stamper-Kurn, UC Berkeley Room: Grand Ballroom D |
Thursday, June 2, 2022 2:00PM - 2:30PM |
U10.00001: Many-body QED with atoms and photons Invited Speaker: Kyung Soo Choi An exciting frontier in quantum information science is the creation and manipulation of quantum systems that are built and controlled quanta by quanta. In this context, there is active research worldwide to achieve strong and coherent coupling between light and matter as the building block of complex quantum systems. Despite the range of physical behaviours accessible by these QED systems, the low-energy description is often masked by small fluctuations around the mean fields. In contrast, we describe our theory/experimental program towards novel forms of light-matter quantum systems, where a highly correlated Rydberg material (Rydberg ice) is strongly coupled to cavity fields. We call this new domain of strong coupling quantum optics, "many-body quantum electrodynamics." I describe our laboratory efforts towards the exploration of new physics for light-matter interaction, where locally gauged quantum materials are entirely driven by quantum optical fluctuation. Genuinely surprising phenomena may arise from the universal features of non-perturbative physics of many-body QED, including the stabilizations of quantum spin liquids and self-correcting quantum memories. |
Thursday, June 2, 2022 2:30PM - 3:00PM |
U10.00002: Observation of a molecular bond between ions and Rydberg atoms using a high-resolution pulsed ion microscope Invited Speaker: Tilman Pfau Atoms with a highly excited electron, called Rydberg atoms, can form unusual types of molecular bonds. The bond differs from the well known ionic and covalent bonds not only by its binding mechanism, but also by its bond length ranging up to several micrometres. We report the observation a new type of molecular bond based on the interaction between the ionic charge and a flipping induced dipole of a Rydberg atom with a bond length of several micrometres. We measure the vibrational spectrum and spatially resolve the bond length and the angular alignment of the molecule using a high-resolution ion microscope. As a consequence of the large bond length, the molecular dynamics is extremely slow. These results pave the way for future studies of spatio-temporal effects in molecular dynamics, e.g., beyond Born- Oppenheimer physics. |
Thursday, June 2, 2022 3:00PM - 3:12PM |
U10.00003: Switching a monolayer atomic mirror using a single Rydberg atom Kritsana Srakaew, Pascal Weckesser, David Wei, Daniel Adler, Simon Hollerith, Immanuel Bloch, Johannes Zeiher Understanding and tuning light-matter interactions is essential for numerous applications in quantum science. Cooperative response between light-coupled atoms has recently led to the realization of a sub-radiant mirror formed by an atomic monolayer with strong light-matter coupling even down to the level of single photons[1]. Here, we control the optical response of such an atomic mirror using a single ancilla atom excited to a Rydberg state. The switching behavior is controlled by admixing Rydberg character to the atomic mirror and exploiting strong dipolar Rydberg interactions with the ancilla. Driving Rabi oscillations on the ancilla atom, we demonstrate coherent control the degree of transmission and reflection. Finally, increasing the mirror size directly reveals the spatial area around the ancilla atom where the switching is effective. Our results pave the way towards novel quantum metasurfaces and the creation of controlled atom-photon entanglement. |
Thursday, June 2, 2022 3:12PM - 3:24PM |
U10.00004: Coherent Delocalization in a Frozen Rydberg Gas Matthew T Eiles, Alexander Eisfeld, Ghassan Abumwis, Christopher W Wächtler The long-range dipole-dipole interaction can create delocalized states due to the exchange of excitation between Rydberg atoms. We show that even in a random gas many of the single-exciton eigenstates are surprisingly delocalized, composed of roughly one quarter of the participating atoms. We identify two different types of eigenstates, one which stems from strongly-interacting clusters and one which extends over large delocalized networks, and show how to excite and distinguish them via appropriately tuned microwave pulses. The extent of delocalization can be enhanced by degeneracies in the atomic states which be controllably lifted using the Zeeman splitting provided by a magnetic field. |
Thursday, June 2, 2022 3:24PM - 3:36PM |
U10.00005: Realizing distance-selective interactions in a Rydberg-dressed atom array Johannes Zeiher, Simon Hollerith, Kritsana Srakaew, David Wei, Antonio Rubio Abadal, Daniel Adler, Pascal Weckesser, Andreas Kruckenhauser, Valentin Walther, Rick Van Bijnen, Jun Rui, Christian Gross, Immanuel Bloch Neutral atoms trapped in optical lattices or optical tweezers are an appealing platform for quantum computing. Atomic ground states are well suited to store quantum information, and entanglement can be created by coupling to highly excited Rydberg states. Typically, Rydberg interactions feature long-range tails, which complicate the isolation of pairs of atoms during the required two-qubit gate operations. Here, we employ off-resonant laser coupling of molecular potentials between Rydberg atom pairs to engineer interactions that are strongly peaked in distance. We verify the resulting “Rydberg-dressed” interactions between ground state atoms using many-body Ramsey interferometry in a quantum gas microscope. We identify atom loss and coupling to continuum modes as the main limitation of our present scheme and outline paths to mitigate these effects, thereby paving the way towards the parallelized creation of large-scale entanglement. |
Thursday, June 2, 2022 3:36PM - 3:48PM |
U10.00006: Designing complex spin interactions in Rydberg tweezer arrays Lea-Marina Steinert, Philip Osterholz, Robin Eberhard, Ludwig Mueller, Roxana Wedowski, Arno Trautmann, Christian Gross Synthetic quantum systems based on individually trapped neutral atoms allow studying many-body systems which are hard to solve classically. The classes of many-body systems which can be implemented experimentally are limited by the programmability of the interatomic interactions. We report on the realization of a beyond-Ising spin-1/2 model, where the strong and tunable interactions are based on the off-resonant coupling to highly-excited electronic P states (Rydberg dressing). The effective spins are encoded in the hyperfine ground state manyfold and prepared in individual optical traps (tweezer arrays at various geometries). The Van-der-Waals interactions between the Rydberg states lead to a strong mixing between usually well-separated m_j-sublevels. This opens up controllable interaction channels allowing to implement spin hopping as well as flipping two spins of the same state to the opposite spin state. Using these new types of interactions as well as their long-range character paves the way to implement new types and classes of quantum magnets. |
Thursday, June 2, 2022 3:48PM - 4:00PM |
U10.00007: Measurement of g(3)(R) in quantum gases using ultralong range Rydberg molecules(ULRMs) Soumya K Kanungo, Y. Lu, C. Wang, J. Burgdorfer, S. Yoshida, F. B Dunning, T. C Killian ULRMs have been used as an in-situ probe to measure the non-local spatial correlations in quantum gases1, where the Rydberg dimer excitation rates directly measure the pair correlation function g(2)(R). Different internuclear separations, R, are probed by changing the principal quantum number n. We extend this study to measure excitation rates of Rydberg trimers in ultracold gases of strontium to extract the non-local three-body correlation function g(3)(R) and present evidence of bunching that agrees with theoretical predictions of the third-order correlation function. We also discuss progress towards understanding excitation of Rydberg dimers and trimers in a Bose-Einstein condensate of 84Sr to demonstrate long-range coherence. |
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