Superconducting Flux Memory for Cryogenic Applications
Abstract
We report the development of flux memory for use with superconducting circuits. This technology stores persistent currents in superconducting loops on-chip to be used to provide flux biasing for superconducting circuits, like qubits. We developed three types of flux memory and draw comparisons among them for circuit design. We demonstrate the utility of flux memory by using an in-situ flux detector and characterize each approach and further demonstrate that once flux is set in a memory cell, benchtop DC control sources can be powered off, leaving the on-chip flux bias in place. We propose that flux memory can be arranged in a two-dimensional configuration to multiplex control signals and reduce how line counts scale (N^2 devices -> 2N control lines), and our experimental results pave the path to the proposed scalability. We demonstrate the use of flux memory to flux bias a transmon qubit and show the tunability of the qubit state to a target frequency which remained stable on-chip for 20 hours.
Related
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BibTeX
@misc{boyd2026superconducting,
title = {{Superconducting Flux Memory for Cryogenic Applications}},
author = {Gregory R. Boyd and Jeremy Clark and Mark Covington and David G. Ferguson and Aref Fouladi and Keith D. Hillaire and Moe Khalil and John McFarland and Aaron Pesetski and Anthony J. Przybysz and John X. Przybysz and Sambarta Rakshit and Aruna N. Ramanayaka and Brian Sears and Robert Smith and Colin Stack and Robert M. Young and Tony X. Zhou},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00772},
eprint = {2609.00772},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00772},
note = {CC BY-SA 4.0},
}
RIS
TY - UNPB
TI - Superconducting Flux Memory for Cryogenic Applications
AU - Gregory R. Boyd
AU - Jeremy Clark
AU - Mark Covington
AU - David G. Ferguson
AU - Aref Fouladi
AU - Keith D. Hillaire
AU - Moe Khalil
AU - John McFarland
AU - Aaron Pesetski
AU - Anthony J. Przybysz
AU - John X. Przybysz
AU - Sambarta Rakshit
AU - Aruna N. Ramanayaka
AU - Brian Sears
AU - Robert Smith
AU - Colin Stack
AU - Robert M. Young
AU - Tony X. Zhou
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.00772
UR - https://arxiv.org/abs/2609.00772
AB - We report the development of flux memory for use with superconducting circuits. This technology stores persistent currents in superconducting loops on-chip to be used to provide flux biasing for superconducting circuits, like qubits. We developed three types of flux memory and draw comparisons among them for circuit design. We demonstrate the utility of flux memory by using an in-situ flux detector and characterize each approach and further demonstrate that once flux is set in a memory cell, benchtop DC control sources can be powered off, leaving the on-chip flux bias in place. We propose that flux memory can be arranged in a two-dimensional configuration to multiplex control signals and reduce how line counts scale (N^2 devices -> 2N control lines), and our experimental results pave the path to the proposed scalability. We demonstrate the use of flux memory to flux bias a transmon qubit and show the tunability of the qubit state to a target frequency which remained stable on-chip for 20 hours.
ER -