Compact superconducting transmon qubit circuits made of ultrathin NbN

Author:

Wei XingYu12ORCID,Jiang JunLiang12ORCID,Xu Wenqu12ORCID,Guo Tingting12,Zhang Kaixuan12,Li Zishuo12,Zhou Tianshi12,Sheng Yifan12,Cao Chunhai12,Sun Guozhu123ORCID,Wu Peiheng123ORCID

Affiliation:

1. Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University 1 , Nanjing 210023, China

2. Hefei National Laboratory 2 , Hefei 230088, China

3. Purple Mountain Laboratories 3 , Nanjing 211111, China

Abstract

We design and fabricate a compact superconducting qubit circuit made of nano-thick NbN film on a high-resistivity silicon substrate, carrying seven transmon qubits. By comparing with the conventional superconducting qubit circuits made of superconducting films with hundred-nanometer thickness, our superconducting qubit circuit has much smaller size in the readout circuit, whose resonator length is only about 1/20 of that in a conventional superconducting circuit. Transmons are measured and characterized in the frequency and time domains with different flux bias. The transition frequency f01 can be adjusted in the range of several GHz. The qubit circuits made of such nano-thick material with high kinetic inductance are promising in the integration of quantum circuits.

Funder

Innovation Program for Quantum Science and Technology

the Fundamental Research Funds for the Central Universities

PADA, State Key Laboratory for Novel Software Technology at Nanjing University and Dengfeng Project B for Nanjing University

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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