Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S43: Quantum SimulationsInvited Live Streamed
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Sponsoring Units: DQI DCOMP Chair: Yariv Yanay, Laboratory for Physical Sciences Room: McCormick Place W-375B |
Thursday, March 17, 2022 8:00AM - 8:36AM |
S43.00001: Practical quantum simulation with Floquet calibration Invited Speaker: Zhang Jiang Simulating quantum systems on a quantum computer may avoid the prohibitively high computational cost incurred in traditional approaches. However, systematic errors presented in current quantum devices can add up quickly and have to be mitigated. Common gate characterization tools are often too slow to capture time-varying systematic errors, such as drifts and fluctuations in control fields. We introduce a fast and accurate gate characterization method to minimize systematic errors, called Floquet characterization. Using this technique, we simulate the dynamics of a one-dimensional Fermi-Hubbard model with over 600 two-qubit gates on a superconducting quantum processor. We observe separations in the charge and spin degrees of freedom, the first time such a phenomenon is observed on a digital quantum computer. |
Thursday, March 17, 2022 8:36AM - 9:12AM |
S43.00002: Digital-Analog Quantum Computation and Simulation Invited Speaker: Ana Martin Fernandez Digital-analog quantum computation is an alternative universal quantum computing paradigm which makes use of the natural (analog) interaction Hamiltonian between qubits as an entangling resource combined with fast single-qubit rotations (digital steps). It is a near-term solution to the limitations of NISQ devices which has shown higher resilience against error noises and better scalability perspectives. Therefore, it is possible to adapt and engineer new quantum algorithms which avoid the noise associated to the two-qubit gates in the digital paradigm. Here, we will introduce the digital-analog paradigm and show its university in Hamiltonian simulations. Additionally, we will see how quantum algorithms can be adapted to this paradigm, in particular, the quantum Fourier transform and the Harrow-Hassidim-Lloyd. This will show very helpful to propose co-designed quantum processors to implement them efficiently. Finally, we will analyze its behavior under sensible noise sources by comparing its performance and scalability against the fully digital one. |
Thursday, March 17, 2022 9:12AM - 9:48AM |
S43.00003: Many-body physics in driven-dissipative superconducting quantum circuits Invited Speaker: Ruichao Ma Superconducting circuits have emerged as a leading platform for quantum computing and simulation. The long coherence, strong interactions, and high controllability make circuits ideal for exploring correlated quantum materials made of microwave photons. The precise control over the coupling to engineered baths enables studies of emergent quantum phases and dynamics in both coherent and driven-dissipative settings. In recent work, we experimentally demonstrated dissipative stabilization of a photonic Mott insulator by coupling a Bose-Hubbard qubit lattice to a narrowband incoherent bath. Here, we propose experiments to create novel entangled many-body states in qubit lattices in the presence of tunable broadband baths. Multiple baths can serve as source and/or sink to implement an effective chemical potential for photons, and also provide a natural way to probe quantum transport across interacting channels. I will discuss our experimental progress and briefly discuss other directions we are pursuing in our new lab at Purdue. |
Thursday, March 17, 2022 9:48AM - 10:24AM |
S43.00004: Matrix-product-state methods for non-Markovian models Invited Speaker: Jonathan Keeling When an open quantum system is strongly coupled to a structured environment, describing the dynamics of that system becomes a challenging problem. Moreover, traditional approaches, based on time evolution of the reduced density matrix are generally not able to correctly calculate higher-order or multi-time correlations. I will review recent progress that addresses both these issues, by showing how the time evolution of the system can be efficiently simulated using tensor network methods [1]. Such a tensor network naturally leads one to consider the process tensor (PT), an object which encodes all multi-time correlations of the reservoir [2]. A key insight is that one can construct efficient MPO representations of the PT. This idea makes possible many otherwise challenging tasks, including optimisation of non-Markovian systems [3] (requiring repeated simulation of the dynamics), and modelling the non-Markovian dynamics of many-body open quantum systems [4,5]. It also prompts identification of alternate algorithms to constrcut an MPO form of the PT [6]. |
Thursday, March 17, 2022 10:24AM - 11:00AM |
S43.00005: Observation of a prethermal discrete time crystal: a nonequilibrium phase of matter on a quantum simulator Invited Speaker: William N Morong Quantum simulators, such as chains of trapped ions with engineered spin-spin interactions, have proven to be a powerful platform for the investigation of non-equilibrium physics. For example, periodic driving can result in the creation of novel phases of matter, such as the discrete time crystal, with no static counterpart. However, stabilizing these phases requires preventing runaway heating due to the drive. We demonstrate a technique to evade this heating and realize a prethermal discrete time crystal on a trapped-ion quantum simulator. By applying a high-frequency drive, heating is suppressed, leading to an expansive time window in which nonequilibrium phases can emerge. Our results establish Floquet prethermalization as a general strategy for creating, stabilizing, and studying intrinsically out-of-equilibrium phases of matter. |
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