Bulletin of the American Physical Society
22nd Annual Meeting of the APS Northwest Section
Volume 67, Number 5
Friday–Saturday, June 3–4, 2022; Thompson Rivers University, Kamloops, British Columbia, Canada
Session G01: Contributed I |
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Friday, June 3, 2022 1:45PM - 1:57PM |
G01.00001: Structural Phase Transition of Trapped Ions in the Quantum Regime Brendin T Chow, Jie Zhang, Paul C Haljan We experimentally characterize the 1D linear to 2D zigzag structural transition for arrays of ions confined in a linear radio-frequency Paul trap and cooled to near their ground state of motion. The transition is controllably quenched by a ramp of the confining potential. Raman sideband spectroscopy is used to probe both the energy level structure and the motional population distribution of the zigzag vibrational mode, which softens near the transition critical point. A robust critical point is achieved through stabilization of the trap potential, and significant ground state occupation is demonstrated crossing the transition. Near the critical point we resolve biases arising from ion-trap asymmetries that change the nature of the transition, and show how they can be suppressed. |
Friday, June 3, 2022 1:57PM - 2:09PM |
G01.00002: Contactless Measurements of Low-Temperature Metal-to-Insulator Transitions at Microwave Frequencies Jake S Bobowski, Ian R Kennedy We have developed an apparatus to make sensitive measurements of metal-to-insulator transitions in condensed matter systems. The technique uses a high-Q resonator that operates at microwave frequencies and it does not require electrical contact to the sample under investigation. The sample and resonator are cooled to low temperatures using a two-stage closed-cycle cryocooler. The sample temperature can be controlled independently of the temperature of the resonator and the cryocooler's base temperature. Reflection coefficient measurements made using a low-cost vector network analyzer (VNA) allow us to track the quality factor of the loaded resonator as a function of the sample temperature. We will discuss the design and construction of the apparatus. Preliminary measurements of the so-called Verwey transition at 120 K in a single-crystal sample of Fe3O4 (magnetite) will be presented. We will also discuss an observed metal-to-insulator transition near 30 K in a sample of electron-doped silicon. |
Friday, June 3, 2022 2:09PM - 2:21PM |
G01.00003: A Simulation of a Simulation: Algorithms for Measurement-Based Quantum Computing Experiments Ryohei K Weil The paradigm of measurement-based quantum computing (MBQC) provides an ideal theoretical playground to characterize quantum computational resources. Recent advances have yielded a formalism to characterize the computational power of one-dimensional MBQC resource states, as well as techniques for minimizing decoherence. We discuss techniques developed for the showcase of these results experimentally on Noisy Intermediate-Scale Quantum (NISQ) devices. We introduce a post-processing algorithm that allows us to bypass the (generally inefficient) transformation to the resource states of interest, as well as a variational quantum algorithm that allows us to obtain the coefficients of this transformation. We share the results of executing these algorithms on IBM quantum devices, providing the first experimental demonstration of the robustness of quantum computational power. |
Friday, June 3, 2022 2:21PM - 2:33PM |
G01.00004: Index Matching CAT Scan Mark J Paetkau, Owen Paetkau, Vincent Daley Computerized tomography (CT) scans are based on interesting X-ray physics, but due to their bulk, cost and safety, hands on experience with an X-ray based scanner is unrealistic for undergraduate students. This project details the development of a small, novel, safe and inexpensive CT scanner. The experimental set-up presented utilizes visible light, has short data acquisition time and operates on the same physics as it's X-ray counterpart. The apparatus employs microcontrolled stepper-motors, a laser and photo-diode to image a transparent material submerged in a matching index of refraction liquid. A simple back-projection algorithm results in a 2-D cross section of the object. Data can be collected and image reconstructed in under 15 minutes. |
Friday, June 3, 2022 2:33PM - 2:45PM |
G01.00005: Dynamics and Stability of Gauged Q-balls in Axisymmetry Michael Kinach Solitons are stable, localized configurations of fields that behave in many ways like particles. One of the simplest examples of a soliton in classical field theory is a Q-ball, which arises in U(1)-invariant complex scalar field theories with a non-linear attractive potential. When the U(1) symmetry is gauged, the Q-balls acquire an electric charge and are known as "gauged Q-balls". Here we present results from numerical experiments involving U(1) gauged Q-balls in axisymmetry. Our simulations suggest that there exist both stable and unstable branches of gauged Q-ball configurations in the model. We analyze the characteristics of stable gauged Q-balls and investigate the final fate of the unstable configurations. We conclude by discussing the similarities and differences between Q-balls in the gauged and non-gauged theories. |
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