Millikelvin digital-to-analog converter for superconducting quantum processors

• URL: http://arxiv.org/abs/2604.25303v1
• Date: Tue, 28 Apr 2026 07:12:13 GMT
• Title: Millikelvin digital-to-analog converter for superconducting quantum processors
• Abstract summary: superconducting digital-to-analog converter (DAC) integrated with high-coherence fluxonium qubits in a multi-chip module architecture.<n>The DACs generate persistent analog flux signals for tuning qubit parameters and are programmed deterministically using single-flux-quantum pulses.<n> operating at millikelvin temperature, the DACs enable in-situ tuning of fluxonium qubits without measurable degradation of qubit coherence.
• Score: 7.5741699219510545
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Scaling superconducting quantum processors is increasingly constrained by the wiring, heat load, and calibration overhead associated with delivering high-resolution analog signals from room temperature to qubits at millikelvin temperature. Here we demonstrate a superconducting digital-to-analog converter (DAC) integrated with high-coherence fluxonium qubits in a multi-chip module architecture. The DACs generate persistent analog flux signals for tuning qubit parameters and are programmed deterministically using single-flux-quantum (SFQ) pulses, providing a digital interface compatible with established SFQ routing and demultiplexing technologies. Operating at millikelvin temperature, the DACs enable in-situ tuning of fluxonium qubits without measurable degradation of qubit coherence. The presented device provides a static control primitive for flux-tunable qubits, enabling parameter homogenization and eliminating the need for individual room-temperature DC bias lines. These results establish SFQ-programmable millikelvin DACs as a building block for digitally controlled superconducting quantum processors.

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