New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Author:

Place Alexander P. M.,Rodgers Lila V. H.,Mundada Pranav,Smitham Basil M.,Fitzpatrick Mattias,Leng Zhaoqi,Premkumar Anjali,Bryon Jacob,Vrajitoarea Andrei,Sussman Sara,Cheng Guangming,Madhavan Trisha,Babla Harshvardhan K.,Le Xuan Hoang,Gang Youqi,Jäck BertholdORCID,Gyenis AndrásORCID,Yao NanORCID,Cava Robert J.,de Leon Nathalie P.ORCID,Houck Andrew A.ORCID

Abstract

AbstractThe superconducting transmon qubit is a leading platform for quantum computing and quantum science. Building large, useful quantum systems based on transmon qubits will require significant improvements in qubit relaxation and coherence times, which are orders of magnitude shorter than limits imposed by bulk properties of the constituent materials. This indicates that relaxation likely originates from uncontrolled surfaces, interfaces, and contaminants. Previous efforts to improve qubit lifetimes have focused primarily on designs that minimize contributions from surfaces. However, significant improvements in the lifetime of two-dimensional transmon qubits have remained elusive for several years. Here, we fabricate two-dimensional transmon qubits that have both lifetimes and coherence times with dynamical decoupling exceeding 0.3 milliseconds by replacing niobium with tantalum in the device. We have observed increased lifetimes for seventeen devices, indicating that these material improvements are robust, paving the way for higher gate fidelities in multi-qubit processors.

Funder

United States Department of Defense | United States Army | U.S. Army Research, Development and Engineering Command | Army Research Office

ODNI | Intelligence Community Postdoctoral Research Fellowship Program

National Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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