aiqbench analysis
This research introduces on-chip flux memory for superconducting circuits, enabling persistent current storage that eliminates the need for continuous benchtop power sources. By demonstrating stable qubit biasing for 20 hours and proposing a scalable two-dimensional layout to reduce control line complexity, the work directly addresses critical infrastructure challenges in quantum computing architecture.
Superconducting Flux Memory for Cryogenic Applications
arXiv:2609.00772v1 Announce Type: new 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.
Authors:Tony X. Zhou, John McFarland, Aruna N. Ramanayaka, Brian Sears, Colin Stack, Aref Fouladi, Robert Smith, Sambarta Rakshit, Zachary A. Stegen, Keith D. Hillaire, Moe Khalil, Robert M. Young, David G. Ferguson, Anthony J. Przybysz, John X. Pryzbysz, Mark Covington, Gregory R Boyd, Jeremy Clark, Aaron Pesetski
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.
Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Superconductivity (cond-mat.supr-con); Instrumentation and Detectors (physics.ins-det)
arXiv:2609.00772 [quant-ph]
(or arXiv:2609.00772v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2609.00772 arXiv-issued DOI via DataCite (pending registration)
Full text under the publisher's open licence · 239 words
