Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session M24: Analog Quantum Simulation Across PlatformsInvited
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Sponsoring Units: DQI Chair: Hakan Tureci, Princeton University Room: 101DE |
Wednesday, March 6, 2024 8:00AM - 8:36AM |
M24.00001: Discovering novel quantum dynamics with superconducting qubits Invited Speaker: Pedram Roushan In recent years superconducting qubits have become one of the leading platforms for quantum computation and simulation. We utilize these Noisy Intermediate Scale Quantum (NISQ) processors to study nonequilibrium quantum dynamics and simulate quantum phases of matter. I will present some of our recent works in studying robustness of bound states of photons [1], measurement-induced quantum information phases [2], braiding of non-Abelian anyons [3], and the universality classes of dynamics in the 1D Heisenberg chain [4]. Time permitting, I will talk about our effort on analog simulation, using the native Hamiltonian of the device. A goal of this talk is to provide a sense of what NISQ discoveries to anticipate and a time scale for them. |
Wednesday, March 6, 2024 8:36AM - 9:12AM |
M24.00002: Simulating Fermi-Hubbard Physics with Quantum Dot Arrays Invited Speaker: Lieven M Vandersypen Electrostatically-defined quantum dots have emerged as an attractive platform for analog quantum simulation, in particular for studying the extended Fermi-Hubbard model. The energy scales allow to explore the most interesting parts of the phase diagram: individually tunable hopping energies are well below the on-site interaction energies while at the same time far exceed the thermal energy. Site-specific potential offsets are individually tunable and there is a natural long-range interaction energy, further extending the range of physical phenomena that can be explored. In this talk, I will introduce the system and review our latest results (including unpublished work) on quantum magnetism and exciton physics. In addition I will briefly highlight our work on digital quantum simulation. |
Wednesday, March 6, 2024 9:12AM - 9:48AM |
M24.00003: Quantum Simulation with Coplanar-Waveguide Lattices Invited Speaker: Alicia J Kollar Lattices of coplanar waveguide (CPW) resonators realize artificial photonic materials in the tight-binding limit [1] capable of realizing non-Euclidean geometries [2] and unconventional unit cells [3]. Combined with strong qubit-photon interactions, these systems can be used to study dynamical phase transitions, many-body phenomena, and spin models in driven-dissipative systems. These lattices permit the creation of unique devices which host photons in curved spaces, gapped flat bands, and novel forms of qubit-qubit interaction. Here I will present measurements from a next-generation CPW lattice device featuring multiple transmon qubits coupled to a quasi-1D lattice which features not only conventional quadratic band edges, but also flat and linearly-dispersing bands. I will show that presence of the transmon qubits allows enhanced characterization of the distribution of lattice modes and observation of interacting photon effects in the flat bands of the lattice. Alternatively, the lattice modes endow the qubits with an extended interaction, which has different spatial profiles depending on the type of band mediating the interaction. Flux tunability of the qubits allows them to be brought into proximity with all of the different types of bands present in the device. |
Wednesday, March 6, 2024 9:48AM - 10:24AM |
M24.00004: Quantum simulation with ultracold atoms Invited Speaker: Peter Schauss Numerical calculations of quantum many-body systems scale in general exponentially with the number of quantum particles. Larger systems, in particular in the transition to the thermodynamic limit, represents a big challenge and are often not tractable with classical algorithms. Quantum simulation offers a path to more insight for larger systems by realizing the Hamiltonian of interest directly. Here I will discuss approaches using ultracold atoms in optical potentials to perform quantum simulation of Hubbard models and quantum spin systems. In the lab, it is nowadays possible to realize arrays of several thousand atoms with individual control and detection of every atom. The two most prominent atomic platforms with single atom detection are quantum gas microscopes, which are based on ultracold atoms loaded into optical lattices with tunnel coupling, and optical tweezer arrays, where every atom is individually trapped using an optical tweezer. I will discuss both approaches and give an outlook on new possibilities arising by combining ideas of both platforms. |
Wednesday, March 6, 2024 10:24AM - 11:00AM |
M24.00005: Uncovering Local Integrability in Quantum Many-Body Dynamics Invited Speaker: Zlatko K Minev Interacting many-body quantum systems and their dynamics, while fundamental to modern science and technology, are formidable to simulate and understand. However, by discovering their symmetries, conservation laws, and integrability one can unravel their intricacies. Here, using up to 124 qubits of a fully programmable quantum computer, we uncover local conservation laws and integrability in one- and two-dimensional periodically-driven spin lattices in a regime previously inaccessible to such detailed analysis. We focus on the paradigmatic example of disorder-induced ergodicity breaking, where we first benchmark the system crossover into a localized regime through anomalies in the one-particle-density-matrix spectrum and other hallmark signatures. We then demonstrate that this regime stems from hidden local integrals of motion by faithfully reconstructing their quantum operators, thus providing a detailed portrait of the system's integrable dynamics. Our results demonstrate a versatile strategy for extracting hidden dynamical structure from noisy experiments on large-scale quantum computers. |
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