TY - JOUR
T1 - New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
AU - Place, Alexander P.M.
AU - Rodgers, Lila V.H.
AU - Mundada, Pranav
AU - Smitham, Basil M.
AU - Fitzpatrick, Mattias
AU - Leng, Zhaoqi
AU - Premkumar, Anjali
AU - Bryon, Jacob
AU - Vrajitoarea, Andrei
AU - Sussman, Sara
AU - Cheng, Guangming
AU - Madhavan, Trisha
AU - Babla, Harshvardhan K.
AU - Le, Xuan Hoang
AU - Gang, Youqi
AU - Jäck, Berthold
AU - Gyenis, András
AU - Yao, Nan
AU - Cava, Robert J.
AU - de Leon, Nathalie P.
AU - Houck, Andrew A.
N1 - Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41467-021-22030-5
DO - 10.1038/s41467-021-22030-5
M3 - Article
C2 - 33741989
AN - SCOPUS:85102887591
SN - 2041-1723
VL - 12
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 1779
ER -