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 M68: Quantum Computing HardwareInvited
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Sponsoring Units: DQI Chair: Kevin Satzinger, Google Quantum AI Room: Room 420 |
Wednesday, March 8, 2023 8:00AM - 8:36AM |
M68.00001: Building Superconducting Quantum Hardware towards Error-Corrected Quantum Computing Invited Speaker: Christopher Eichler Quantum Computers will ultimately rely on near-perfect logical gates, implemented while correcting errors at the physical level. The need for developing quantum hardware optimized for performing fast, repeatable, and high-fidelity syndrome measurements in quantum error-correcting codes such as the surface code therefore becomes increasingly important. In my talk, I will present advances in performing qubit readout and two-qubit gates in multi-qubit superconducting quantum processors, which enabled the recent experimental demonstration of repeated quantum error correction in surfaces codes. I will show how quantum processors optimized for quantum error correction can also serve as a testbed to explore noisy intermediate-scale quantum algorithms. The talk will conclude with a discussion about open challenges and opportunities to advance the speed and fidelity of syndrome detection in scalable device architectures by exploiting tunable coupling elements. |
Wednesday, March 8, 2023 8:36AM - 9:12AM |
M68.00002: Spin qubits: Control, calibration and readout in multi-qubit arrays Invited Speaker: Anasua Chatterjee Encoding quantum information in the spins of electrons or holes confined in semiconductor quantum dots is a promising technology, due to their long coherence times, inherent gate-voltage tunability and compatibility with industrial foundry fabrication. As these quantum systems are scaled up in linear and two-dimensional arrays to form NISQ processors, the density of gate electrodes can lead to more and more operational complexity. In this talk, I will present four directions of active research. First, I will present advances in multi-gate-layer fabrication of qubits implemented in academic facilities, as well as in industrial foundries focusing on spin-based quantum processors. Second, I will present our work on implementing fast, high-fidelity and simultaneous qubit readout, in particular involving RF-reflectometry, across small arrays of quantum dots. Third, I will discuss the importance of methods such as the implementation of automated tuning, loading and calibration of gate-voltage controlled arrays of quantum dots. Lastly, I will showcase functionalities enabled by new techniques of quantum control, such as real-time fast feedback using FPGA-based machinery that enables online, closed-loop control and calibration of quantum systems. These efforts utlize high-quality heterostructures in silicon, germanium, and gallium arsenide quantum wells, as well as devices made using industrial CMOS processes on large-scale 300mm wafers. I will also discuss the current need, and future prospects, for techniques such as crosstalk mitigation, multi-qubit pulse calibration, sensor compensation, virtual gating, and adaptive readout. The near-term goal is to engineer scalable spin qubit networks demonstrating stable and coherent qubit arrays for computation, as well as for the simulation of phenomena relevant for fundamental physics and chemistry applications. |
Wednesday, March 8, 2023 9:12AM - 9:48AM |
M68.00003: Recent advances toward a more capable trapped ion quantum computer Invited Speaker: Grahame Vittorini I will provide an introduction to Quantinuum's trapped ion QCCD architecture and highlight some applications implemented on our current H1-series hardware. I will also present some recent hardware advances along our technical roadmap for transport as well as barium qubits. |
Wednesday, March 8, 2023 9:48AM - 10:24AM |
M68.00004: Mid-circuit readout and error mitigation on a dual-species atom array processor Invited Speaker: Hannes Bernien Scaling up invariably error-prone quantum processors is a formidable challenge. While quantum error correction ultimately promises fault-tolerant operation, the required qubit overhead and error thresholds are daunting, and many codes break down under correlated noise. Recent proposals have suggested a complementary approach based on co-located, auxiliary ‘spectator’ qubits. These act as in-situ probes of noise, and enable real-time, coherent corrections of the resulting errors on the data qubits. Here, we use an array of cesium spectator qubits to correct correlated phase errors on an array of rubidium data qubits [1]. Crucially, by combining in-sequence readouts, data processing, and feed-forward operations, these correlated errors are suppressed within the execution of the quantum circuit. |
Wednesday, March 8, 2023 10:24AM - 11:00AM |
M68.00005: Quantum information processing based on silicon-CMOS technology Invited Speaker: Andrew S Dzurak In this talk I will discuss the advantages and challenges facing the development of quantum computers employing spin-based quantum processors that can be manufactured using industry-standard silicon CMOS technology. I will begin by discussing the development of SiMOS quantum dot qubits, including the demonstration of high-fidelity single-qubit gates [1], the first demonstration of two-qubit logic gate [2], and assessments of silicon qubit fidelities [3,4]. I will then explore the technical issues related to scaling a CMOS quantum processor [5] up to the millions of qubits that will be required for fault-tolerant QC, including demonstrations of silicon qubit operation above one kelvin [6] and the use of global microwave fields capable of controlling millions of qubits [7]. |
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