Curator's Take
AI Commentary
This article matters because it delivers a fully open‑source, RFSoC‑based control stack that rivals commercial instruments in bandwidth (up to 9.3 GHz) and timing precision (107 ps pulse resolution) while keeping the FPGA resource footprint modest. By integrating deterministic sequencing, frequency‑multiplexed readout, and a low‑overhead client‑server software layer, FIREQ bridges the gap between flexible research setups and the high‑throughput demands of larger superconducting qubit arrays. Its validation on an actual transmon—showing realistic T₁ and T₂* values—demonstrates that labs can now build scalable control hardware without sacrificing performance, accelerating both calibration workflows and multi‑qubit experiments. The main caveat is that users still need familiarity with FPGA development and the PYNQ ecosystem to fully exploit its extensibility.
— Mark Eatherly
Summary
We present FIREQ (FPGA Instrumentation for Readout and Qubit control), an open-source RFSoC-based framework for the control and readout of superconducting qubits. FIREQ combines a modular AXI-compliant firmware architecture with a PYNQ-based software stack designed to support extensible hardware integration, deterministic experiment timing, and low-overhead execution of repeated calibration and characterization workflows. The firmware implements direct RF synthesis and acquisition, trigger-based sequencing, programmable pulse generation, frequency-multiplexed readout, and memory-efficient acquisition and waveform buffering. The software adopts a client-server architecture with streamed data transfer and dependency-aware configuration updates to reduce host-device and reconfiguration overhead during parameter sweeps. On an AMD Zynq UltraScale+ RFSoC ZCU216, FIREQ generates RF pulses up to 9.3 GHz with a pulse-duration resolution of 107 ps and an event-timing resolution of 1.7 ns. FPGA resource utilization is compared with representative open-source RFSoC control frameworks, showing a low BRAM footprint while retaining full-rate I/Q generation and acquisition. The RF output is characterized in terms of phase noise, noise spectral density, and inter-channel timing skew. End-to-end operation is validated on a superconducting qubit through resonator spectroscopy, Rabi, Ramsey, and relaxation measurements, yielding T1 = 6.94 us and T2* = 13.50 us. FIREQ can therefore be used both as a qubit-control platform and as an experimental environment for evaluating alternative control and readout IP architectures.