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 U05: Quantum SimulationRecordings Available

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Chair: Wes Campbell, UCLA Room: Salon 9/10 
Thursday, June 2, 2022 2:00PM  2:12PM 
U05.00001: Towards a Dual Species Optical Tweezer Array of Neutral Atoms Kenneth Wang, Fang Fang, Yu Wang, Ryan Cimmino, Avery Parr, Yichao Yu, KangKuen Ni Optical tweezer arrays of neutral atoms have emerged as a promising platform to explore quantum science. This platform is scalable, highly configurable and offers individual control of the atoms. Together with longrange interaction via excitation to Rydberg states, these arrays offer a highly flexible platform to simulate quantum spin models or perform gates for quantum computation. Dual species arrays can further add to the toolbox allowing for schemes that involve two different types of particles. This differentiation into two species is naturally useful for quantum error correction, which requires both data and measurement qubits, and is also the foundation for measurementbased preparation of novel states of matter. We present work towards realizing a twodimensional dual species optical tweezer array using Na and Cs atoms. Through the choice of the Rydberg state used, the relative interaction strengths between NaNa, CsCs and NaCs atoms can be tuned. In particular, we have identified states which allow for a large NaCs interaction while keeping NaNa and CsCs interactions small, which is of particular interest to many of the schemes discussed above. We use a static pattern of spatial light modulator traps, which are ideal for their geometric flexibility. After a stochastic loading process, we rearrange the atoms using mobile tweezer traps formed from acoustooptic deflectors to an array of interest. 
Thursday, June 2, 2022 2:12PM  2:24PM 
U05.00002: Circular Rydberg atoms trapped in an array of optical tweezers Clément Sayrin, Brice Ravon, Paul Méhaignerie, Yohann Machu, Maxime Favier, Andrés Durán Hernandez, JeanMichel Raimond, Michel Brune Rydberg atoms are particularly well suited to quantum simulations, thanks to their strong interactions even at a few micron distance. Regular arrays of Rydberg atoms are now being used in many experimental setups. The simulation time is limited both by the few100µs lifetime of the laseraccessible Rydberg levels and by the fact that Rydberg atoms are untrapped during the simulation. 
Thursday, June 2, 2022 2:24PM  2:36PM 
U05.00003: A twodimensional optical tweezer array of Cs with Raman sideband cooling Fang Fang, Kenneth Wang, yu wang, Ryan Cimmino, Avery Parr, Yichao Yu, KangKuen Ni Individually trapped neutral atoms in geometrically configurable optical tweezers, controllably interacting via their Rydberg states, comprise a promising platform for quantum simulation and computation. To date, they have been used to study quantum spin models, perform quantum logic operations and build a quantum processor. In our experiment, we create a twodimensional 6x12 Cs atomic array using a spatial light modulator (SLM). These static tweezers are loaded from a magnetooptical trap (MOT), with a loading probability of ~ 60%. This stochastically loaded atomic array is later rearranged into a defect free 6x6 atomic array via a mobile optical tweezer array created by acoustic optical deflectors, with an averaged rearrangement fidelity across the target array of around 95%. Raman sideband cooling is applied, achieving motional ground state cooling across the entire array. Motional ground state cooling suppresses Doppler dephasing on the Rydberg transition and paves the way to experiments requiring good coherence between Rydberg and ground state of atoms. 
Thursday, June 2, 2022 2:36PM  2:48PM 
U05.00004: Progress on quantum simulations of nuclear physics using optical tweezer arrays of ytterbium atoms. Michael N Bishof, Kevin G Bailey, Matthew R Dietrich, Francesco Granato, Peter Mueller, Thomas O'Connor Neutral atoms trapped in regular arrays of optical tweezers have emerged as a leading platform for quantum computation and simulation. By pairing this versatile platform with the unique atomic structure of ytterbium atoms, our work aims to construct a quantum simulation apparatus uniquely suited to perform simulations of quarklevel effective field theories for quantum chromodynamics (QCD). These theories are commonly used to explore lowenergy, emergent phenomena in QCD where direct calculations are impossible. Our apparatus will leverage the ultranarrow ^{1}S_{0 }– ^{3}P_{0} “clock” transition in concert with laser coupling between the ^{3}P_{0} state and Rydberg states to greatly reduce the technical requirements and complexity of simulations. Here, we report on progress towards completing our quantum simulation apparatus as well as our future scientific goals. 
Thursday, June 2, 2022 2:48PM  3:00PM 
U05.00005: Quantum optimization on arbitrary graphs using Rydberg atom arrays MinhThi Nguyen, Jinguo Liu, Mikhail Lukin, Shengtao Wang, Hannes Pichler Programmable quantum simulators based on Rydberg atom arrays have been used to probe new quantum phases of matter, to explore new phenomena of nonequilibrium dynamics, and, more recently, to test quantum optimization algorithms. In an earlier proposal [Pichler et al., arXiv:1808.10816], the authors showed that Rydberg atom arrays can be used to encode the maximum independent set (MIS) problem on a particular ensemble of geometric graphs, the socalled unit disk graphs, without any encoding overhead. Here, by using ancillary qubits, we construct an explicit mapping from MIS on arbitrary graphs to MIS on unitdisk graphs, with at most a quadratic overhead. In addition, we extend the mapping to other hard combinatorial optimization problems such as MaxCut and 3SAT. This provides a blueprint for using Rydberg atom arrays to solve many combinatorial optimization problems on arbitrary graphs, beyond the restrictions imposed by the hardware geometry. 
Thursday, June 2, 2022 3:00PM  3:12PM 
U05.00006: Programmable Local Tunnelling in Ultracold Atomic Gases Georgia Nixon, Ulrich Schneider Ultracold atoms in optical lattices represent powerful quantum simulators with large system sizes and long coherence times. Their programmability, however, is traditionally very limited. While onsite energies can be controlled in quantum gas microscopes with singlesite resolution, local control over tunnelling elements remains a challenge. In this work, we demonstrate theoretically that periodically modulating individual onsite energies can provide local, flexible control over the tunnelling elements in a tightbinding model. We explore the functionality of this technique on a threesite plaquette and show we can access models with complex or frustrated tunnelling elements. In one dimension, we can generate arbitrary sequences of tunnelling elements including topologically nontrivial systems such as the SuSchriefferHeeger (SSH) model. Realising singlesite resolved tunnelling greatly broadens the Hamiltonians available to quantum gas experiments for quantum simulation. 
Thursday, June 2, 2022 3:12PM  3:24PM 
U05.00007: Using a trapped ion quantum computer to simulate NMR spectra Debopriyo Biswas, Kushal Seetharam, Crystal Noel, Andrew Risinger, Daiwei Zhu, Or Katz, Sambuddha Chattopadhyay, Marko Cetina, Christopher Monroe, Eugene Demler, Dries Sels Nuclear magnetic resonance (NMR) spectroscopy is a useful tool in understanding molecular composition and dynamics, but simulating NMR spectra of large molecules becomes intractable on classical computers as the spin correlations in these systems can grow exponentially with molecule size. In contrast, quantum computers are well suited to simulate NMR spectra of molecules, particularly zero to ultralow field (ZULF) NMR where the spinspin interactions in the molecules dominate. In this work, we demonstrate the first quantum simulation of an NMR spectrum, specifically that of the methyl group of acetonitrile in ZULF, using a trapped ion quantum computer. The simulation involves stateoftheart "QFAST" circuit synthesis algorithm that produces short circuits, with the circuit sampling rate considerably reduced by employing a compressed sensing technique. This work lays the foundation for simulation of NMR experiments on noisy quantum hardware. 
Thursday, June 2, 2022 3:24PM  3:36PM 
U05.00008: Quantum Simulation and Precision Spectroscopy in Compact Penning Ion Traps Brian J McMahon, Jonathan R Jeffrey, Kevin D Battles, Creston D Herold, Brian C Sawyer Cold, trapped atomic ions form the basis of many stateoftheart quantum technologies including sensors, clocks, simulators, and computers. Penning traps allow confinement of charged particles within a combination of static electric and magnetic fields, permitting coherent manipulation of trappedion qubits with minimal environmental perturbations. In recent decades, researchers have demonstrated ion confinement in compact Penning ion traps based on permanent magnets, reducing the experimental overhead required for trappedion experiments at high magnetic field. We describe our recent demonstrations of Doppler cooling and spectroscopy of ^{40}Ca^{+} and ^{9}Be^{+} in novel, permanentmagnetbased, compact Penning traps [1, 2]. We also discuss progress towards optical addressing of individual ^{40}Ca^{+} ions within a rotating twodimensional Coulomb crystal and applications for quantum simulation (e.g. quantum approximate optimization algorithms). 
Thursday, June 2, 2022 3:36PM  3:48PM 
U05.00009: Observing emergent hydrodynamics in a longrange quantum magnet Manoj K Joshi, Florian Kranzl, Alexander Schuckert, Izabella Lovas, Christine Maier, Rainer Blatt, Michael Knap, Christian Roos Identifying universal properties of nonequilibrium quantum states is a major challenge in modern physics. A fascinating prediction is that classical hydrodynamics emerges universally in the evolution of any interacting quantum system. We study the dynamics of a longrange interacting spin system with nonequilibrium quantum field theory, predicting the emergence of a whole family of hydrodynamic universality classes, ranging from normal diffusion to anomalous superdiffusion. We experimentally test these predictions in the quantum dynamics of 51 individually controlled ions. By measuring spacetime resolved correlation functions in an infinite temperature state, we observe the emergence of hydrodynamics at late time. We extract the transport coefficients of the hydrodynamic theory, reflecting the microscopic properties of the system. Our observations demonstrate the potential for engineered quantum systems to provide key insights into universal properties of nonequilibrium states of quantum matter and uncover the transport processes governing longrange interacting systems. 
Thursday, June 2, 2022 3:48PM  4:00PM 
U05.00010: Triangular arrays of hundreds of Rb atoms for quantum simulation Weikun Tian, An Qu, Wen Jun Wee, Billy Jun Ming Lim, Huanqian Loh Spinfrustrated lattices is an interesting class of condensed matter systems to study, where exotic quantum phases like the quantum spin liquid phase have been predicted to exist. In this talk, we present the realization of a twodimensional triangular tweezer array with hundreds of singlytrapped Rb atoms for simulating spinfrustrated systems. Since the triangular tweezer array is generated by two acoustooptic deflectors oriented at 60 degrees, the Talbot effect is suppressed, allowing the atoms to be trapped in a single plane. We report the loading of atoms into a 20 x 20 tweezer array with a loading probability of 78%. Further, by combining D1 gray molasses cooling and adiabatic ramping, we can image, then release and recapture single Rb atoms with fidelities exceeding 99%. We discuss our efforts to use moving tweezers aligned with the backbone array to create defectfree arrays of not only triangle geometries but also other related geometries like the honeycomb and kagome lattice in a simpler way. In particular, the combination of moving tweezers with a digital mirror device (DMD) allows us to generate arbitrary geometries more efficiently than with moving tweezers alone. Our new platform paves the way for studying quantum manybody physics in large arrays with frustrated geometries. 
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