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

Autor: Xuan Hoang Le, Lila V. H. Rodgers, Youqi Gang, Basil Smitham, Alexander Place, Trisha Madhavan, Nan Yao, Andrei Vrajitoarea, Nathalie P. de Leon, Mattias Fitzpatrick, Jacob Bryon, Andrew Houck, Guangming Cheng, Berthold Jäck, Zhaoqi Leng, Harshvardhan K. Babla, Pranav Mundada, Robert J. Cava, Anjali Premkumar, Sara Sussman, Andras Gyenis
Rok vydání: 2021
Předmět:
Dynamical decoupling
Quantum information
Orders of magnitude (temperature)
Science
FOS: Physical sciences
General Physics and Astronomy
Applied Physics (physics.app-ph)
02 engineering and technology
01 natural sciences
Article
General Biochemistry
Genetics and Molecular Biology
Superconducting properties and materials
Computer Science::Emerging Technologies
0103 physical sciences
010306 general physics
Quantum information science
Quantum computer
Physics
Quantum Physics
Condensed Matter - Materials Science
Millisecond
Multidisciplinary
business.industry
Materials Science (cond-mat.mtrl-sci)
Physics - Applied Physics
General Chemistry
Transmon
021001 nanoscience & nanotechnology
Qubit
Superconducting devices
Optoelectronics
Quantum Physics (quant-ph)
0210 nano-technology
business
Qubits
Coherence (physics)
Zdroj: Nature Communications, Vol 12, Iss 1, Pp 1-6 (2021)
Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-22030-5
Popis: 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.
Quantum computers based on superconducting transmon qubits are limited by single qubit lifetimes and coherence times, which are orders of magnitude shorter than limits imposed by bulk material properties. Here, the authors fabricate two-dimensional transmon qubits with both lifetimes and coherence times longer than 0.3 milliseconds by replacing niobium with tantalum in the device.
Databáze: OpenAIRE
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