QubiC: An open source FPGA-based control and measurement system for superconducting quantum information processors

Abstract

As quantum information processors grow in quantum bit (qubit) count and functionality, the control and measurement system becomes a limiting factor to large scale extensibility. To tackle this challenge and keep pace with rapidly evolving classical control requirements, full control stack access is essential to system level optimization. We design a modular FPGA (field-programmable gate array) based system called QubiC to control and measure a superconducting quantum processing unit. The system includes room temperature electronics hardware, FPGA gateware, and engineering software. A prototype hardware module is assembled from several commercial off-the-shelf evaluation boards and in-house developed circuit boards. Gateware and software are designed to implement basic qubit control and measurement protocols. System functionality and performance are demonstrated by performing qubit chip characterization, gate optimization, and randomized benchmarking sequences on a superconducting quantum processor operating at the Advanced Quantum Testbed at Lawrence Berkeley National Laboratory. The single-qubit and two-qubit process fidelities are measured to be 0.9980$\pm$0.0001 and 0.948$\pm$0.004 by randomized benchmarking. With fast circuit sequence loading capability, the QubiC performs randomized compiling experiments efficiently and improves the feasibility of executing more complex algorithms.

arXiv commentFinal published version on IEEE Transactions on Quantum Engineering

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• Scaling Qubit Readout with Hardware Efficient Machine Learning Architectures
• FPGA-based electronic system for the control and readout of superconducting quantum processors
• ICARUS-Q: Integrated Control and Readout Unit for Scalable Quantum Processors
• SQ-CARS: A Scalable Quantum Control and Readout System
• Radio frequency mixing modules for superconducting qubit room temperature control systems
• Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip