Surpassing millisecond coherence in on chip superconducting quantum memories by optimizing materials and circuit design

Ganjam, Suhas; Wang, Yanhao; Lu, Yao; Banerjee, Archan; Lei, Chan U.; Krayzman, Lev; Kisslinger, Kim; Zhou, Chenyu; Li, Ruoshui; Jia, Yichen; Liu, Mingzhao; Frunzio, Luigi; Schoelkopf, Robert J.

doi:10.1038/s41467-024-47857-6

Title: Surpassing millisecond coherence in on chip superconducting quantum memories by optimizing materials and circuit design

Journal Article · 01 May 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-47857-6 · OSTI ID:2376181

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^[2]; Banerjee, Archan ^[2]; Lei, Chan U. ^[2];

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^[3]; Li, Ruoshui ^[3]; Jia, Yichen ^[3];

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^[2]; Schoelkopf, Robert J. ^[2]

Yale University, New Haven, CT (United States); Google Quantum AI
Yale University, New Haven, CT (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

The performance of superconducting quantum circuits for quantum computing has advanced tremendously in recent decades; however, a comprehensive understanding of relaxation mechanisms does not yet exist. In this work, we utilize a multimode approach to characterizing energy losses in superconducting quantum circuits, with the goals of predicting device performance and improving coherence through materials, process, and circuit design optimization. Using this approach, we measure significant reductions in surface and bulk dielectric losses by employing a tantalum-based materials platform and annealed sapphire substrates. With this knowledge we predict the relaxation times of aluminum- and tantalum-based transmon qubits, and find that they are consistent with experimental results. We additionally optimize device geometry to maximize coherence within a coaxial tunnel architecture, and realize on-chip quantum memories with single-photon Ramsey times of 2.0 – 2.7 ms, limited by their energy relaxation times of 1.0 – 1.4 ms. These results demonstrate an advancement towards a more modular and compact coaxial circuit architecture for bosonic qubits with reproducibly high coherence.

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Research Organization:: Yale University, New Haven, CT (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA); US Army Research Office (ARO)

Grant/Contract Number:: SC0012704

OSTI ID:: 2376181

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Surpassing millisecond coherence in on chip superconducting quantum memories by optimizing materials and circuit design

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