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

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, Berthold; Gyenis, András; Yao, Nan; Cava, Robert J.; de Leon, Nathalie P.; Houck, Andrew A.

doi:10.1038/s41467-021-22030-5

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

Journal Article · Fri Mar 19 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-22030-5· OSTI ID:1816742

Place, Alexander P. M. ^[1]; Rodgers, Lila V. H. ^[2]; Mundada, Pranav ^[2]; Smitham, Basil M. ^[2]; Fitzpatrick, Mattias ^[2]; Leng, Zhaoqi ^[3]; Premkumar, Anjali ^[2]; Bryon, Jacob ^[2]; Vrajitoarea, Andrei ^[2]; Sussman, Sara ^[3]; Cheng, Guangming ^[4]; Madhavan, Trisha ^[2]; Babla, Harshvardhan K. ^[2]; Le, Xuan Hoang ^[2]; Gang, Youqi ^[2]; ^[3]; ^[2]; ^[4]; Cava, Robert J. ^[5]; ^[2] more »

Princeton Univ., NJ (United States). Dept. of Electrical Engineering; OSTI
Princeton Univ., NJ (United States). Dept. of Electrical Engineering
Princeton Univ., NJ (United States). Dept. of Physics
Princeton Univ., NJ (United States). Princeton Inst. for the Science and Technology of Materials
Princeton Univ., NJ (United States). Dept. of Chemistry

The 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge Associated Univ., Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014664

OSTI ID:: 1816742

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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