Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B67: Trapped-ion quantum computingFocus
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Sponsoring Units: DQI Chair: Grahame Vittorini, Honeywell Intl Room: Room 412 |
Monday, March 6, 2023 11:30AM - 11:42AM |
B67.00001: Next generation universal trapped-ion quantum computing system Liudmila Zhukas, Debopriyo Biswas, Yichao Yu, Bahaa Harraz, Keqin Yan, Vivian Zhang, Crystal Noel, Alexander Kozhanov, Christopher Monroe The first generation universal trapped ion-based quantum computer relies on individual addressing of each ion with a separate, controllable beam. In this way, it is possible to drive arbitrary gates between any pair of ions and achieve full connectivity. It performs quantum algorithms with high fidelity on 13 qubits, and high-fidelity quantum gates with up to 23 qubits. |
Monday, March 6, 2023 11:42AM - 11:54AM |
B67.00002: Coherent Control of Trapped Ion Qubits with Localized Electric Fields Maciej Malinowski, Raghavendra Srinivas, Clemens Loschnauer, Amy C Hughes, Rustin Nourshargh, Vlad Negnevitsky, David T Allcock, Steven A King, Clemens Matthiesen, Thomas P Harty, Chris J Ballance We present a new method for parallel coherent control of trapped ion qubits in separate interaction zones by simultaneously applying an electric field and a spin-dependent gradient. The phase and amplitude of the effective single-qubit rotation both depend on the electric field, which can be localised to each zone. We demonstrate this interaction on a single ion using both laser-based and magnetic field gradients in a surface-electrode ion trap, and measure the localisation of the electric field. |
Monday, March 6, 2023 11:54AM - 12:06PM |
B67.00003: QSCOUT: An Open Quantum Computing Testbed with Low-Level Access to the Hardware and Software (Part I) Ashlyn D Burch, Christopher G Yale, Matthew N Chow, Joshua D Goldberg, Megan K Ivory, Daniel S Lobser, Benjamin C Morrison, Melissa C Revelle, Kenneth M Rudinger, Antonio E Russo, Jay W Van Der Wall, Andrew J Landahl, Susan M Clark At Sandia National Laboratories, QSCOUT (the Quantum Scientific Computing Open User Testbed) is an open quantum computing testbed based on Yb-171 trapped ions. Distinct from most commercial platforms, we offer users flexible and transparent control over the qubits as well as the ability to craft gates at the fundamental pulse level. To do this, we use our custom-developed programming language Jaqal (Just Another Quantum Assembly Language), consisting of a package of schedulable native operations that includes the full parameterization of single qubit rotation gates and the two-qubit Mølmer-Sørensen (MS) gate. Here, we discuss how we employ both the QSCOUT hardware and the Jaqal software to offer users unique low-level access to the experiment for their quantum computing applications. We present current capabilities offered on the system as well as future integrations and developments. |
Monday, March 6, 2023 12:06PM - 12:18PM |
B67.00004: QSCOUT: Continuously parameterized Mølmer-Sørensen gates for quantum computing circuits (Part II) Christopher G Yale, Ashlyn D Burch, Matthew N Chow, Megan K Ivory, Daniel S Lobser, Melissa C Revelle, Swarnadeep Majumder, Titus Morris, Raphael Pooser, Ryan Shaffer, Hang Ren, Emiliia Dyrenkova, Hartmut Haeffner, Susan M Clark The Quantum Scientific Computing Open User Testbed (QSCOUT) at Sandia National Laboratories is a small trapped-ion quantum computer with high-fidelity, customizable Raman gates available to the scientific community. One of QSCOUT’s more unique features is full parameterization of not only the one-qubit gate set but also the native two-qubit Mølmer-Sørensen (MS) gate. Here, we present the empirical realization and coherent error budget of our continuously parameterized MS gates and then discuss how the gates were crucial to recent user project collaborations. In one collaboration, we use the gates for coherent error injection to investigate error characterization and mitigation with hidden inverses. In another, we directly probe the gates themselves via an efficient verification method for continuously parameterized gates known as randomized analog verification. |
Monday, March 6, 2023 12:18PM - 12:30PM |
B67.00005: Controlled Carbon Contamination of a Surface Ion Trap Benjamin V Saarel Electric field noise is an important error source for high-fidelity operation of ion trap quantum processors. This noise is orders of magnitude larger than expected from known noise sources. Cleaning the trap surface reduces the measured surface contamination and reduces the measured noise, suggesting contamination is responsible for a significant portion of the noise. One of main surface contaminants observed on nearly all trap surfaces is carbon and at least two studies have correlated the amount of surface carbon contamination with the amount of measured noise during a cycle of cleaning. However, different cleaning methods that all successfully remove contamination lead to very different reductions in noise, suggesting the cleaning methods modify the surface in ways besides removing material. |
Monday, March 6, 2023 12:30PM - 12:42PM |
B67.00006: Towards motional mode engineering in a long trapped ion string using optical tweezers Roland Matt, Jeremy B Flannery, Luca Huber, Robin Oswald, Jonathan Home Long linear trapped ion crystals are a well established platform for quantum information processing and quantum simulations. Performing high fidelity gate operations which rely on shared phonon modes becomes challenging due to spectral crowding and motional heating. Parallel gate operations become especially difficult due to the collective nature of phonon modes. These challenges can be mitigated by engineering the trapping potentials along the string locally to decouple the motion of selected ions from the collective. Selectively increasing confinement at specific ions can be used to create local motional modes. This also increases the frequency of the common motional mode, which results in a reduction of motional heating to allow for higher gate fidelity. |
Monday, March 6, 2023 12:42PM - 12:54PM |
B67.00007: Reconfigurable Single Ion Addressing System Nicole S Greene, Elia Perego, Hartmut Haeffner The ability to scale QIP to larger systems relies on the individual control of qubits in a multi-qubit register with small crosstalk. Towards this goal, we have designed a novel single ion addressing scheme that allows reconfigurable and parallel control of single and multi qubit gates across a chain of trapped ions using Raman transitions. |
Monday, March 6, 2023 12:54PM - 1:06PM |
B67.00008: A Trapped Ion Computing Platform with Software-Tailored Architecture for Quantum co-design Marissa Donofrio, Jacob H Whitlow, Tianyi Chen, Samuel Phiri, Junki Kim, Leon Riesebos, Bradley Bondurant, Mark Kuzyk, Kenneth R Brown, Jungsang Kim A full-stack approach to quantum computing is required in order to fully leverage the field’s capabilities. This requires collaborative design and integration between stack layers, from the algorithms and programming language to the qubit-specific hardware. Our hardware team on the Software-Tailored Architecture for Quantum co-design (STAQ) project focuses on demonstrating quantum advantage on an ion trap platform developed at Duke University. I will discuss progress toward the project’s goal of realizing a 32-qubit, fully-connected quantum computer, based on Yb-171 ions and available to collaborating universities through an easily programmable software interface. The system utilizes a Sandia surface trap with high optical access and is engineered for optomechanical stability, using a low-vibration cryostat [1]. Notable features include a 32-channel AOM allowing parallel implementation of Raman transitions, a stable turnkey laser system enabling precise, long-term frequency stabilization [2], and ARTIQ control infrastructure supported by a DAX scheduling toolkit [3]. |
Monday, March 6, 2023 1:06PM - 1:18PM |
B67.00009: Error Correction with Sympathetically Cooled Yb+ Ions Marko Cetina, Lei Feng, Tianyi Wang, Or Katz, Christopher Monroe, Kenneth R Brown, Jungsang Kim, Andrew Van Horn, Qingfeng Wang, Crystal Noel We report on progress towards performing multiple rounds of fault-tolerant error correction using a chain of Yb+ ions. To counter the effect of motional heating during encoding and syndrome readout, we implement sympathetic cooling using co-trapped 172Yb+ ions. |
Monday, March 6, 2023 1:18PM - 1:54PM |
B67.00010: High-Field Qubits in Compact Penning Ion Traps Invited Speaker: Brian C Sawyer Ensembles of trapped atomic ions are a resource for experimental quantum sensing, simulation, and computation. The ions’ charge allows for tight confinement within the static or time-varying electromagnetic fields of Penning or Paul traps, respectively. The inter-ion Coulomb repulsion induces spatial correlations and, ultimately, crystallization at temperatures accessible via traditional Doppler laser cooling techniques. Previous work has demonstrated the utility of Penning ion traps for control of large (> 100-ion) Coulomb crystals for precision metrology and quantum simulation using qubits at high magnetic field (> 1 T). We have recently developed compact Penning traps for precision measurement and quantum simulation experiments that are built with room-temperature permanent magnet arrays instead of the more traditional cryogenic superconducting coils. Our compact Penning traps enable precise control of high-magnetic-field qubits in a small and agile form factor akin to traditional Paul traps. We discuss recent experimental demonstrations including: (i) coherent optical addressing of individual 40Ca+ metastable qubits within rotating two-dimensional arrays, (ii) generation of spin-spin entanglement in high-field metastable qubits, (iii) long-lived 9Be+ spin coherence in Ca+-Be+ mixed-species crystals, and (iv) integration of an optical enhancement cavity for efficient laser cooling using near-infrared electric-dipole-forbidden transitions. |
Monday, March 6, 2023 1:54PM - 2:06PM |
B67.00011: Towards Quantum Error Correction with Dual Isotopes in a Cryogenic Trapped-Ion Experiment Jeremy Flannery, Roland Matt, Luca Huber, Robin Oswald, Jonathan Home Trapped-ion systems have been used to realize quantum error correction due to their long coherence times and high gate fidelity. The protection of logical quantum information is performed by the redundant encoding of many so-called "data" qubits. Error correction is implemented by in-sequence periodic detection of ancilla qubits to enable the appropriate conditional feedback pulses applied to the data qubits. We propose and demonstration experiments towards using two isotopes of calcium ions for the purpose of data and ancilla qubits. The spectral separation between isotopes allows for the in-sequence readout of ancilla qubits while preserving coherence of the data qubits. In addition, these ancilla qubits can be used to sympathetically re-cool motional modes of the ion string to enable high fidelity gates. The similar masses of isotopes results in strong coupling between the radial motion of ions, which is used as a quantum bus for entanglement between ions. Our system consists of a cryogenic ultra-high vacuum apparatus to allow for the stable trapping of long linear ion strings in a segmented-electrode micro-fabricated ion trap. Individual control of ions is provided by a multi-core fiber focused perpendicular to the string axis, and an EMCCD camera providing low latency individual readout for fast feedback. |
Monday, March 6, 2023 2:06PM - 2:18PM |
B67.00012: Frequency-robust Mølmer–Sørensen Gates via Motional Mode Balancing Brandon P Ruzic, Matthew N Chow, Ashlyn D Burch, Daniel S Lobser, Melissa C Revelle, Joshua M Wilson, Christopher G Yale, Susan M Clark Trapped ions are one of the most promising platforms for quantum computing with high-fidelity entangling gates having been demonstrated on many systems. However, maintaining high fidelity as the length of the ion chain grows remains a challenge due to an increased density of motional modes, intensifying the need to stabilize their frequencies. A variety of techniques have been developed to provide frequency robustness of a few kHz to gate performance, but they typically require optimizing a large set of pulse-shape parameters. In this talk, we introduce a technique that extends this range of robustness by an order of magnitude without requiring a many-parameter optimization process. Our technique employs a Mølmer–Sørensen gate with Gaussian amplitude modulation and a specific choice of detuning that balances the contributions from all motional modes to provide optimal frequency robustness. We experimentally demonstrate our gate on a three-ion chain and analyze the scalability of our gate through numerical simulations on chains up to 33 ions. |
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