Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Z34: Quantum Simulation and Novel Qubit ArchitecturesFocus Recordings Available

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Sponsoring Units: DAMOP Chair: Sina Zeytinoglu, Harvard University Room: McCormick Place W193A 
Friday, March 18, 2022 11:30AM  11:42AM Withdrawn 
Z34.00001: Multifunctional atomicensemble quantum memory Michal Parniak, Mateusz Mazelanik, Wojciech Wasilewski, Adam Leszczyński, Michał Lipka We present a system that embeds multiple functionalities in what was originally designed as a multiplexed quantum repeater node. Our quantum memory is based on a cold atomic ensemble that uses multiplexing of wavevectors. 
Friday, March 18, 2022 11:42AM  11:54AM 
Z34.00002: Confinement and Mott transitions of Onedimensional Z_{2} Lattice Gauge Theories with Dynamical Matter Matjaz Kebric, Umberto Borla, Christian Reinmoser, Sergej Moroz, Ulrich Schollwöck, Luca Barbiero, Fabian Grusdt Confinement is an ubiquitous phenomenon when matter couples to gauge fields, which manifests itself in a linear string potential between two static charges. Although gauge fields can be integrated out in one dimension, they can mediate nonlocal interactions which in turn influence the paradigmatic Luttinger liquid properties. However, when the charges become dynamical and their densities finite, understanding confinement becomes challenging. In my talk I will show that confinement in 1D Z_{2} lattice gauge theories, with dynamical matter fields and arbitrary densities, is related to translational symmetry breaking in a nonlocal basis. The exact transformation to this stringlength basis leads us to an exact mapping of Luttinger parameters reminiscent of a LutherEmery rescaling. 
Friday, March 18, 2022 11:54AM  12:06PM 
Z34.00003: Towards a Mechanical Qubit in a Carbon Nanotube Christoffer B Møller

Friday, March 18, 2022 12:06PM  12:18PM 
Z34.00004: Dissipation and Bulk Viscosity in 1D SpinPolarized Fermi Gases Jeff A Maki, Shizhong Zhang Onedimensional quantum liquids at low energy are often described by the Luttinger liquid model. To investigate dissipative effects, it is necessary to include nonlinear terms whose form depend on the microscopic details of the system. For example, in the investigation of the bulk viscosity of 1D nonrelativistic Fermi gases with even parity interactions, threebody effects are required to generate a finite bulk viscosity that is inconsistent with the conformal symmetry. In this talk we address these questions and evaluate the bulk viscosity for a nonrelativistic spin polarized Fermi gas with odd parity interactions. We find results consistent with nonrelativistic conformal symmetry, as the bulk viscosity is due to twobody interactions beyond the Luttinger liquid model. 
Friday, March 18, 2022 12:18PM  12:30PM 
Z34.00005: Properties of Dipolar Impurities in a Dipolar Medium Jeremy R Armstrong, Artem Volosniev We calculate properties of a static impurity placed into a three dimensional Bose gas made of trapped dipoles. We assume that the impurityboson interaction potential has a shortrange part and a longrange tail. To find the selfenergy of the impurity, we solve a GrossPitaevski equation. We also compute the induced impurityimpurity interaction, which can be highly anisotropic for strong dipolar interactions. Finally, we relate our findings to a Bosepolaron problem. In this case, we transform into a frame comoving with the impurity, and obtain a modified GrossPitaevskii equation, which we numerically solve. The polaron selfenergy is obtained as a function of the strength of the dipoledipole interaction and trap confinement parameters. 
Friday, March 18, 2022 12:30PM  1:06PM 
Z34.00006: Localization and delocalization in kicked quantum matter Invited Speaker: David M Weld A sizable fraction of the vast field of condensed matter physics consists of the exploration of the effects of spatial periodicity on quantum mechanics. It is now widely recognized that the effects of temporal periodicity give rise to a related array of phenomena, and that the interplay of temporal and spatial periodicity with manybody interactions creates particularly rich new possibilities. In this talk I will describe some recent experiments on kicked quantum matter, including a study of manybody delocalization in an interacting ensemble of kicked quantum rotors, the first experimental observation of the recentlypredicted "quantum boomerang effect," and realization of a kicked quasicrystal which exhibits an extended multifractal phase intermediate between localized and delocalized regimes. The results illuminate a variety of phenomena ranging from the interplay of ergodicity and localization to fractal wavefunctions to new techniques of quantum control. 
Friday, March 18, 2022 1:06PM  1:18PM 
Z34.00007: Constraintbased scheme for realizing Z2 lattice gauge theories with matter in (2+1)D Lukas Homeier, Jad C Halimeh, Christian Schweizer, Arkady Fedorov, Monika Aidelsburger, Annabelle Bohrdt, Fabian Grusdt Lattice gauge theories (LGTs) coupled to matter have been out of reach of tabletop experiments for decades. Recent developments in the field, in particular of Rydberg atom arrays and superconducting qubits (SCQs), have moved this goal within reach for stateoftheart analog quantum simulation platforms and NISQ devices. In this talk, I will propose an elegant and readily realizable scheme to experimentally simulate Z2 LGTs coupled to matter in (1+1) and (2+1)dimensions suitable for Rydberg atom arrays or SCQs. The scheme is based on a novel protection scheme using local pseudo generators (LPGs) to stabilize a target gauge sector. The proposal allows to study many topics of Z2 LGTs in the strong coupling limit that are currently extremely challenging to address numerically in (2+1)D. The list of topics include the presence of an exotic topological, deconfined (Toric Code) phase, the details of a deconfinementconfinement transition or the Schwinger effect, to name a few. Starting from a microscopic Hamiltonian in the lab frame, I will derive an effective Hamiltonian that describes a Z2 LGTs coupled to matter, and compare to largescale numerical simulations. 
Friday, March 18, 2022 1:18PM  1:30PM 
Z34.00008: Optimal Configurations and "Pauli Crystals" of Quantum Clusters Saad Khalid Broken rotational and translational symmetries are the hallmarks of solid state materials. In contrast, quantum liquids and gases do not exhibit such properties. However, if we regard the logarithm of the absolute square of a quantum liquid as an energy E= ln(Ψ^{2}), a geometric pattern naturally occurs at the minimum, i.e. the optimal configuration. Such geometric patterns have recently been studied for noninteracting fermions, and have been named ``Pauli crystals". However, such patterns exist in all interacting gases (Bose or Fermi), independent of statistics. Here, we present an algorithm to determine the optimal configurations of quantum clusters solely from the images of their densities and without theoretical inputs. We establish its validity by recovering a number of exact results, showing that it can identify the changes in the cluster's ground state which corresponds to phase transitions in bulk systems. 
Friday, March 18, 2022 1:30PM  1:42PM 
Z34.00009: Quantifying Cluster State Construction with Dipolar Interactions Zhangjie Qin, Vito W Scarola, WooRam Lee, Bryce Gadway, Brian L DeMarco, Svetlana Kotochigova Cluster states are quantum entangled states that can serve as resource states for measurementbased quantum computing. Measurementbased quantum computing is equivalent to circuitbased quantum computing but can show advantages if cluster states can be prepared efficiently, i.e., with parallel implementation of entangling gates. Interactions between optically trapped atoms and molecules can be used to engineer cluster states where, for example, the dipoledipole interaction between polar molecules trapped in optical tweezers entangles molecular rotational states. But parallelization of the entanglement process comes with a tradeoff in efficacy because entangling operations between polar molecules will induce cluster state errors from longerrange parts of the dipolar interaction. We construct a measure to diagnose the fidelity of cluster states constructed with errors due to interaction tails. We use the fidelity to maximize parallelizability while minimizing errors and construct procedures using global timedependent fields to build highfidelity cluster states with dipoledipole and other longrange interactions. Our work shows that the construction of cluster states using recent advances in atomic, molecular, and optical physics can be efficiently parallelized in systems with longrange interactions. 
Friday, March 18, 2022 1:42PM  1:54PM 
Z34.00010: Quantum enabled operation of a microwaveoptics interface Rishabh Sahu, William Hease, Alfredo R Rueda Sanchez, Georg Arnold, Liu Qiu, Johannes M Fink Superconducting qubits and semiconductor spin systems are some of the most promising candidates for scalable, high clock speed quantum computing. Connecting many such microwave nodes to implement a highdensity quantum network remains an open challenge. Since telecom wavelength light is the ideal choice to transfer quantum information at room temperature, there has been a lot of development in microwaveoptical transduction. Nevertheless, quantumlimited coherent conversion remained elusive due to either low total efficiency or pump induced heating. We present a quantumenabled interface between itinerant microwave and optical light. We use a pulsed electrooptic whispering gallery mode transducer to demonstrate nanosecond timescale control of the complex mode amplitude with an input added noise of only 0.16 (1.11) quanta for the microwavetooptics (reverse) direction. Working close to unity cooperativity with all involved modes close to their quantum ground state, we observe not only laser cooling of a superconducting microwave mode but also parametrically amplified vacuum noise. This new field of quantumlimited microwave photonics offers many new possibilities ranging from multiplexed classical control to long distance quantum interconnects. 
Friday, March 18, 2022 1:54PM  2:06PM 
Z34.00011: Strained crystalline nanomechanical resonators with ultralow dissipation Alberto Beccari, Diego A Visani, Sergey A Fedorov, Mohammadjafar Bereyhi, Victor Boureau, Nils Johan Engelsen, Tobias J Kippenberg In strained mechanical resonators, the concurrence of tensile stress and geometric nonlinearity dramatically reduces dissipation. This phenomenon, dissipation dilution, is employed in mirror suspensions of gravitational wave interferometers and at the nanoscale, where soft clamping and strain engineering have allowed extremely high quality factors. However, these techniques have so far mostly been applied in amorphous materials, specifically Si_{3}N_{4}. Crystalline materials exhibit significantly lower intrinsic damping at cryogenic temperatures, due to the absence of two level systems in the bulk, and engineering dissipation dilution in strained crystalline mechanical resonators could enable exquisite force sensors and optomechanical transducers, due to the combination of reduced internal friction, high intrinsic strain, and high yield strength. Here, we demonstrate that single crystal strained silicon, a material developed for high mobility transistors, can be used to realize ultracoherent mechanical resonators. We fabricate high aspect ratio (> 10^{5} ) nanostrings supporting MHz mechanical modes with Q > 10^{10} at 7 K, the highest reported at liquid He temperatures. We characterize thoroughly the dissipation temperature dependence for localized and nonlocalized modes. Finally, we will discuss our progress in characterizing the nanostrings at He dilution temperatures, where the scaling laws of singlecrystal materials hint at outstanding mechanical performance. 
Friday, March 18, 2022 2:06PM  2:18PM 
Z34.00012: Optomagnonics in dispersive media: magnonphoton coupling enhancement at the epsilonnearzero frequency Victor Bittencourt, Iñigo Liberal, Silvia ViolaKusminskiy Reaching strong lightmatter coupling in solidstate systems has been long pursued for the implementation of scalable quantum devices. Here, we put forward the concept of a platform capable of achieving strong coupling between magnetic excitations (magnons) and optics based in an epsilonnearzero medium, that's it, a medium in which the permittivity is close to zero. We adopt a phenomenological approach to quantize the electromagnetic field inside a dispersive magnetic medium and obtain a Hamiltonian describing the interaction between photons and magnons and the frequencydependent coupling. We predict that, in the epsilonnearzero regime, the singlemagnon photon optomagnonic coupling can be comparable to the uniform magnon's frequency for small magnetic volumes. For stateoftheart illustrative values, this would correspond to achieving the singlemagnon strong coupling regime, where the coupling rate is larger than all the decay rates. Finally, we show that the nonlinear energy spectrum intrinsic to this coupling regime regime can be probed via the characteristic multiple magnon sidebands in the photon power spectrum. 
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