Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session S09: Control and Simulation with Trapped Ions |
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Chair: Crystal Senko, UWaterloo Room: 206 D |
Thursday, June 8, 2023 10:30AM - 10:42AM |
S09.00001: Ion chains in periodic potentials: Devil's staircases and quantum effects Giovanna Morigi, Raphael Menu, Maria Luisa Chiofalo, Jorge Yago Malo We theoretically analyse the ground state of the Frenkel-Kontorova model where the particles interact via repulsive power-law forces. We show that the classical ground state can be mapped to the one of a long-range, antiferromagnetic Ising model and is a complete devil staircase as a function of the discommensuration. We then show that in the full quantum regime the commensurate-incommensurate transition is described by the Thirring model with power-law interactions. We analyse the mean-field phase diagram for Coulomb chains in relevant experimental regimes and determine the relevant spectroscopic features signalling the transition. |
Thursday, June 8, 2023 10:42AM - 10:54AM |
S09.00002: Controlling a single motional quantum in a two-dimensional ion microtrap array Justin F Niedermeyer, Nathan K Lysne, Andrew C Wilson, Daniel H Slichter, Dietrich Leibfried Two-dimensional arrays of ions trapped in individual, dynamically tunable microtraps are a promising technology for quantum computation and simulation. By controlling the motional excitations of the ions (phonons) in such microtrap arrays, one may be able to generate multipartite entangled states of the ions and also simulate complex Hamiltonians such as bosons in synthetic gauge fields. We trap three 9Be+ ions in a microfabricated surface electrode ion trap that generates three confining potential wells spaced 30 mm apart on the vertices of an equilateral triangle. By applying static potentials to the trap electrodes, we can individually tune the potential curvatures at each trapping site. When the motion of ions in several sites is near resonance, phonons can be transferred between sites due to the ions’ Coulomb interaction. The dynamics of a single motional excitation in the triangular array can be described either as site-localized phonons with beamsplitter-like interactions that can lead to interference, or as non-local normal modes shared between sites. Here, we report on our ability to control these single-phonon dynamics in a two-dimensional ion microtrap array. We present evidence of two ions trapped in separate sites coherently exchanging a single phonon over 100 times. We then extend the manipulation of single-phonon dynamics to all three sites by selectively tuning their curvatures and comparing experimental observations to simulations. |
Thursday, June 8, 2023 10:54AM - 11:06AM |
S09.00003: Observation of magnon bound states in the long-range, anisotropic Heisenberg model Stefan Birnkammer, Florian Kranzl, Alvise Bastianello, Michael Knap, Christian Roos, Rainer Blatt Over the recent years coherent, time-periodic modulation has been established as a versatile tool for realizing novel Hamiltonians. Using this approach, known as Floquet engineering, we experimentally realize a long-ranged, anisotropic Heisenberg model with tunable interactions in a trapped ion quantum simulator. We demonstrate that the spectrum of the model contains not only single magnon excitations but also composite magnon bound states. For the experimentally realized long-range interactions, the group velocity of magnons is unbounded. Nonetheless, for sufficiently strong interactions we observe bound states of these unconventional magnons which possess a non-diverging group velocity. By measuring the configurational mutual information between two disjoint intervals, we demonstrate the implications of the bound state formation on the entanglement dynamics of the system. Our observations provide key insights into the peculiar role of composite excitations in the non-equilibrium dynamics of quantum many-body systems. |
Thursday, June 8, 2023 11:06AM - 11:18AM |
S09.00004: Detection and Quantum Control of Molecular States via Electric-field Gradients Generated by a Cryogenic Ion Trap Grant D Mitts, Clayton Z Ho, Hao Wu, Eric R Hudson Molecular ions possess a myriad of electric dipole transitions, many of which exist in the microwave and RF regime. These transitions allow for strong, laser-free coupling between long-lived energy states, making them favorable quantum logic candidates. Previously described in (PhysRevA. 2021, 104, 042605), applying an oscillating voltage to a linear ion trap will produce an electric gradient to address these splittings, allowing for the application of electric-field gradient gates (EGGs). Presented is a description of our cryogenic dual species ion trap employing co-trapped HCl+ and Ca+ in addition to the current progress towards using EGGs to perform hyper-fine spectroscopy of the ground lambda-doublet states of HCl+. |
Thursday, June 8, 2023 11:18AM - 11:30AM |
S09.00005: Searching for a dipole-phonon interaction with CaO+ and Ca+ Lu Qi, Evan C Reed, Kenneth R Brown We will report our progress on searching for the dipole-phonon interaction between CaO+ and its axial secular motion in a CaO+ and Ca+ two-ion chain. The interaction between the dipole of a molecular ion in an ion chain and the phonon modes of the ion chain enables new tools for state preparation and measurement of molecular ions[1,2]. We have already demonstrated the near ground-state cooling of the axial motional modes of CaO+ via sympathetic sideband cooling with a co-trapped Ca+. We have also shown that the phonon state of the axial out-of-phase mode of the ion chain is maintained when the mode frequency is adiabatically ramped up or down [3]. This adiabatic ramping should allow for an adiabatic population transfer between molecular ion’s internal state and the phonon state. Experimental challenges include the mixture of molecular states at room temperature and the theoretical uncertainties in the molecular ion properties. We will discuss these challenges and present our experimental progress. |
Thursday, June 8, 2023 11:30AM - 11:42AM |
S09.00006: Quantum information engine using trapped ions Jialiang Zhang, Pengfei Wang, Wentao Chen, Zhengyang Cai, Mu Qiao, Jingning Zhang, Man-Hong Yung, Kihwan Kim A quantum information engine is an apparatus that converts quantum information into work, where the quantum state measurements become an energy source. We realize a quantum engine with a single trapped-ion system that consists of a qubit and a single vibrational mode, where the measurement results of the qubit are used to give a work on the vibrational mode. In the experiment, the qubit is prepared in a thermal state. Then we measure the qubit state and apply adiabatic blue-sideband transition or red-sideband transition depending on the measurement result. After that, the qubit state is restored to the initial state, which completes the cycle of the engine. Through the cycle, the energy of the mode increases, which is observed by the increase of the average phonon number. We develop a fast detection to minimize the effect on the mode, which can be helpful for number resolving detection of multiple modes. |
Thursday, June 8, 2023 11:42AM - 11:54AM |
S09.00007: Towards a Ba-133 trapped ion quantum simulator Noah Greenberg, Collin Epstein, Xinghe Tan, Akbar J Jozani, Rajibul Islam, Crystal Senko We present our progress toward an academic Ba-133 trapped ion testbed, which will provide a sophisticated platform for probing this exciting barium isotope. The project aims to demonstrate advanced cooling techniques on long chains of this unique isotope, ion shuttling, and generation of spin-spin entanglement between ions. Due to its unrivaled experimental state preparation and measurement fidelities, Ba+ has recently emerged as a top contender among trapped ion candidates for quantum simulation and information processing. However, a significant challenge with the Ba-133 isotope is its radioactivity (half-life of 10.6 years), only allowing microgram quantities to be used for trapping. We describe techniques for creating ablation targets with microgram quantities of barium chloride and quantify their feasibility for trapped ion experiments by measuring ablation-generated neutral fluorescence. Further, we comment on the use of an autoionizing resonance in Ba-133 for increased trapping probability and isotope selective loading of this elusive ion using a two-step photoionization process (553.70 & 389.74 nm). |
Thursday, June 8, 2023 11:54AM - 12:06PM |
S09.00008: Progress Towards Intra-Cavity Enhancement Cooling Ca+ in a Compact Penning Trap Kevin D Battles, Brian C Sawyer, Brian J McMahon Cold, trapped atomic ions are of interest for experiments in quantum simulation, sensing and metrology, and quantum information science. Compact Penning traps facilitate the generation of 2-D ion crystals through a combination of permanent magnet geometries and static electric fields. In addition to magnet geometry, additional design improvements can be made to optimize trap characteristics. Our novel trap design incorporates temperature-stable permanent magnets, interchangeable PCB electrodes, an in-vacuum optical cavity for all-infrared laser cooling enhancement and laser ablation loading. We present results on characterizing laser ablation loading and all-infrared cooling Ca+. We also discuss future steps to introduce 43Ca+ and 44Ca+ co-confinement for progress towards dual-species high-field atomic clock transitions. |
Thursday, June 8, 2023 12:06PM - 12:18PM |
S09.00009: Magic Conditions in the Hyperfine Clock Qubit of 133Ba+ Samuel Vizvary, Zachary J Wall, Matthew Boguslawski, Andrei P Derevianko, Thomas Dellaert, Eric R Hudson, Wesley C Campbell Trapped ion quantum computing requires high power lasers to perform gate operations. Because of this, unwanted shifts of the qubit frequency spacing caused by laser intensity fluctuations lead to decreases in qubit coherence times as well as gate errors during operation. At zero applied magnetic field, it is impossible to eliminate these shifts when manipulating atoms with laser light. However, at non-zero magnetic field, state mixing leads to magic conditions where these shifts are eliminated. Taking advantage of these mixed states, we show a large increase in qubit coherence time when exposed to a high power laser at easily set lab conditions. Furthermore, the threshold field is sensitive to higher-order perturbations which allows for a comparison of experiment to theory. |
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