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DOE OSTI · 2531214

Implementation of scalable suspended superinductors

Jünger, Christian [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000349090652)·Chistolini, Trevor [University of California, Berkeley, CA (United States)] (ORCID:0000000264612263)·Nguyen, Long B. [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000187701763)·Kim, Hyunseong [University of California, Berkeley, CA (United States)] (ORCID:0000000341287119)·Chen, Larry [University of California, Berkeley, CA (United States)] (ORCID:0000000183588521)·Ersevim, Thomas [University of California, Berkeley, CA (United States)] (ORCID:0009000191388914)·Livingston, William [University of California, Berkeley, CA (United States)] (ORCID:0000000183990975)·Koolstra, Gerwin [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000265745789)·Santiago, David I. [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000180745130)·Siddiqi, Irfan [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000322001090)
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Abstract

Superinductors have become a crucial component in the superconducting circuit toolbox, playing a key role in the development of more robust qubits. Enhancing the performance of these devices can be achieved by suspending the superinductors from the substrate, thereby reducing stray capacitance. Here, we present a fabrication framework for constructing superconducting circuits with suspended superinductors in planar architectures. To validate the effectiveness of this process, we systematically characterize both resonators and qubits with suspended arrays of Josephson junctions, ultimately confirming the high quality of the superinductive elements. In addition, this process is broadly compatible with other types of superinductors and circuit designs. Furthermore, our results not only pave the way for scalable superconducting architectures utilizing superinductors but also provide the primitive for future investigation of loss mechanisms associated with the device substrate.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYElectronic circuitsKerr effectsNanomaterialsResonator deviceSuperconducting devicesSuperconducting quantum computing

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Jünger, Christian [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000349090652), Chistolini, Trevor [University of California, Berkeley, CA (United States)] (ORCID:0000000264612263), Nguyen, Long B. [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000187701763), Kim, Hyunseong [University of California, Berkeley, CA (United States)] (ORCID:0000000341287119), Chen, Larry [University of California, Berkeley, CA (United States)] (ORCID:0000000183588521), Ersevim, Thomas [University of California, Berkeley, CA (United States)] (ORCID:0009000191388914), Livingston, William [University of California, Berkeley, CA (United States)] (ORCID:0000000183990975), Koolstra, Gerwin [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000265745789), Santiago, David I. [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000180745130), Siddiqi, Irfan [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000322001090). 2025-01-29. Implementation of scalable suspended superinductors. https://doi.org/10.1063/5.0250341

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