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

Alexander P. M. Place, Lila V. H. Rodgers, Pranav Mundada, Basil M. Smitham, Mattias Fitzpatrick, Zhaoqi Leng, Anjali Premkumar, Jacob Bryon, Andrei Vrajitoarea, Sara Sussman, Guangming Cheng, Trisha Madhavan, Harshvardhan K. Babla, Xuan Hoang Le, Youqi Gang, Berthold Jäck, András Gyenis, Nan Yao, Robert J. Cava, Nathalie P. de Leon and Andrew A. Houck ()
Additional contact information
Alexander P. M. Place: Princeton University
Lila V. H. Rodgers: Princeton University
Pranav Mundada: Princeton University
Basil M. Smitham: Princeton University
Mattias Fitzpatrick: Princeton University
Zhaoqi Leng: Princeton University
Anjali Premkumar: Princeton University
Jacob Bryon: Princeton University
Andrei Vrajitoarea: Princeton University
Sara Sussman: Princeton University
Guangming Cheng: Princeton University
Trisha Madhavan: Princeton University
Harshvardhan K. Babla: Princeton University
Xuan Hoang Le: Princeton University
Youqi Gang: Princeton University
Berthold Jäck: Princeton University
András Gyenis: Princeton University
Nan Yao: Princeton University
Robert J. Cava: Princeton University
Nathalie P. de Leon: Princeton University
Andrew A. Houck: Princeton University

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-22030-5

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