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 X10: Quantum Hardware and Supporting Systems |
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Chair: Huanqian Loh, National University of Singapore Room: 207 |
Friday, June 9, 2023 8:00AM - 8:12AM |
X10.00001: Toward On-Chip Spin Magnetomechanics with Levitated Systems Trisha N Madhavan, John D Schaefer, Emma Rosenfeld, Frankie Fung, Bartholomeus Machielse, Nadine Meister, Mikhail D Lukin Interfacing quantum nonlinearities with the mechanics has become an exciting research direction with long term applications such as unprecedented quantum sensitivity and mechanically-mediated quantum networks. We demonstrate spin-mechanical coupling on a novel platform comprised of a mechanical resonator and a spin qubit. The mechanical resonator consists of a micromagnet in a three-dimensional trap formed by a planar superconductor, offering excellent environmental isolation and a high magnetic field gradient-to-mass ratio. We choose to work with NV centers in diamond as our spin qubit due to their long coherence times, large magnetic coupling, and optical initialization and readout. Coupling between the resonator and the spin is achieved by bringing the magnetic resonator in close proximity to an NV center. Recent improvements to the platform will allow us to achieve stronger spin-mechanical couplings, enabling near-term milestones such as the detection of quantum backaction, and eventually cooling of the resonator. |
Friday, June 9, 2023 8:12AM - 8:24AM |
X10.00002: Investigations of the benefits and challenges of using integrated optics for trapped-ion quantum logic May E Kim, Colin D Bruzewicz, Kyle Debry, Robert McConnell, David L Reens, Matthew P Roychowdhury, John Chiaverini Trapped ion qubits have proven to be an excellent platform for quantum information processing due to their ability to be decoupled from the environment, enabling long coherence times and high-fidelity state preparation, gate operation, and readout. One of the open questions in quantum computing with trapped ions is how best to build up a practical quantum system. One promising approach is based on microfabricated ion trap chips with integrated photonic waveguides and grating out-couplers. Here, we demonstrate single and two qubit gates with $^{88}$Sr$^+$ trapped ion qubits using such a trap chip. The gates are performed with a 674 nm beam that is either coupled into the waveguides or is delivered via free space. We compare the two delivery methods to demonstrate progress towards a robust quantum logic, and we present challenges that still need to be overcome. |
Friday, June 9, 2023 8:24AM - 8:36AM |
X10.00003: Rapid Exchange Cooling with Calcium Ions Spencer Fallek, Vikram Sandhu, Ryan A McGill, John M Gray, Holly N Tinkey, Craig R Clark, Kenton R Brown In trapped ion quantum information, maintaining low ion temperature of computational ions is key to performing high fidelity gates. However, sympathetic cooling, the current standard in the field, is both slow and experimentally complex. In this work, we experimentally study the technique of dynamic exchange cooling. The protocol utilizes a bank of cold ions to cool the hotter computational ions. Both the coolant and computational ions are of the same atomic species. The Coulomb interaction mediates an energy exchange between a coolant ion and a computational ion. We test this concept with two ions, showing that the process is efficient and fast. We remove over 96% (as many as 100 quanta) of axial motional energy from a computational ion. The resonant energy transfer to a coolant ion takes just 5.8 µs. The process can be repeated for additional cooling. Moreover, we verify that re-cooling the coolant ion does not decohere the computational ion. |
Friday, June 9, 2023 8:36AM - 8:48AM |
X10.00004: Experimental Work Towards an Individually-Addressed-Ion Penning Trap Quantum Simulator Brian J McMahon, Creston D Herold, Brian C Sawyer Trapped ions constitute a robust platform for quantum simulation. Penning traps provide a means to increase the number of trapped ion qubits to many hundreds or even thousands by confining the particles in a planar configuration. Penning traps utilize static electric and magnetic fields for confining ions which provide the advantage of reduced motional heating and state-of-the-art motional frequency stability. We designed and operate a compact Penning trap using rare earth permanent magnets for increased optical access to the trapped 40Ca+ ions as compared to superconducting magnet systems. However, the trapped ions rotate in the trap’s magnetic field making individual addressing and readout challenging. We implement the proposed technique [1, 2] to use a triangular rotating wall potential to lock the rotation frequency and phase of the planar trapped 40Ca+ crystal with minimal structural defects. A Tpx3Cam collects the scattered photons’ positions and incident times to perform individual readout of each ion’s state. We perform the individual addressing of metastable (D5/2) qubits using either stimulated-Raman interactions or a focused AC Stark shifting laser beam combined with global microwave rotations. We detail our work towards a global light-shift entangling gate with applications including the quantum approximate optimization algorithm (QAOA). |
Friday, June 9, 2023 8:48AM - 9:00AM |
X10.00005: QSCOUT: Quantum Scientific Computing Open User Testbed Melissa C Revelle, Ashlyn D Burch, Matthew N Chow, Megan K Ivory, Daniel S Lobser, Christopher G Yale, Susan M Clark The Quantum Scientific Computing Open User Testbed (QSCOUT) is a quantum computing testbed using trapped-ion qubits designed to address the potential of near-term quantum hardware for scientific computing applications. This ytterbium-ion based system employs a Sandia microfabricated surface ion trap, high-fidelity individual addressing Raman gates, and distinguishable state detection. QSCOUT stands apart from the commercial alternatives because it provides low-level access to the quantum hardware via our custom assembly language, Jaqal (Just Another Quantum Assembly Language). This enables the users to adapt and modify the quantum gates and underlying pulse sequences or use the native operations including a fully parameterized 2-qubit gate. Another benefit is the Sandia scientists interact directly with the QSCOUT users and collaborators, allowing them to realize the full potential of the machine. This talk will present the current experimental capabilities, plans for future developments, and upcoming collaboration opportunities, and some of our most recent results. |
Friday, June 9, 2023 9:00AM - 9:12AM |
X10.00006: A control system for driving dynamic circuits on atom- and ion-based quantum processors using camera and photodiode-based readout Yonatan Cohen, Ramon Szmuk, Theo Laudat, Alex Kotikov, Gilad Sivan Atom- and ion-based quantum computing platforms enjoy many advantages, such as high scalability and state-of-the-art fidelities, but suffer from slow readout compared to qubit driving timescales. This limits the possibility of performing mid-circuit measurements, quantum error correction schemes, and lowers the number of achievable circuit layer operations per second (CLOPS). Feedback based on cameras typically suffers from high latency, limited by atom/ion exposure times, camera frame transfer rates, as well as the control system’s latency, which limits current systems to readout rates below 100Hz. |
Friday, June 9, 2023 9:12AM - 9:24AM |
X10.00007: Customizable Modular Ultracold System Control System Kaiyue Wang, Feng Xiong, Jonathan Yang, Colin V Parker Experiments on ultracold atom gases require stable generation of radio frequency, microwave, analog and digital signals with time precision and synchronization. There have been open-source, customizable solutions developed and maintained by the community [1][2] as popular options or references for building a control system in addition to the commercial products and services. Over the years, our lab has developed a home-made modular system featuring card rack holders integrated with power supply, communication, clock and synchronization. We have also designed signal modules of various functionalities, each of which is programmable with a microcontroller and has tunable parameters that can be updated before each experimental sequence runs. The system is controlled using the Matlab software, where the experimental sequences and parameters are organized declaratively using XML and YAML. We will share the design and details of our control system, from hardware to software, with flexibility, customizability, and extensibility that can be adapted to other AMO research scenarios. |
Friday, June 9, 2023 9:24AM - 9:36AM |
X10.00008: Scientific CMOS (sCMOS) Camera Capabilities with a Focus on Quantum Applications Brad Coyle, Klea Dhimitri, Keith Bennett, Tadashi Maruno, Stephanie Fullerton, Takafumi Higuchi, Taiki Miura Scientific CMOS (sCMOS) cameras have developed rapidly over the past decade benefiting from the advancement and wide usage of CMOS image sensors. The talk will provide an overview on Hamamatsu’s latest sCMOS camera, ORCA-Quest quantitative CMOS (qCMOS) camera, with photon number resolving capability and discuss some of the camera’s features. We discuss the role of sCMOS cameras in emerging quantum applications ranging from quantum optics to neutral atoms. |
Friday, June 9, 2023 9:36AM - 9:48AM |
X10.00009: Development and implementation of a quantum science undergraduate laboratory class Danyel Cavazos-Cavazos, Hannes Bernien, Alexander A High Given the growing demand and interest in a 'quantum literate' workforce, the development of new courses and pedagogy for teaching quantum mechanics at the undergraduate level is both necessary and critical. We have developed a senior-level laboratory class on which students can acquire hands-on experience on experiments involving state of the art quantum platforms such as entangled photons, ultracold atoms and nitrogen-vacancy (NV) centers. We discuss the organization and implementation of the class as well as the experiments carried out by the students. We will report on the implementation of this class over two consecutive offerings, and our strategies for making the class accessible to cohorts of students with a diverse set of previous experimental skills and experience. |
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