New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 19, 2021
- Source ID
- 10.1038/s41467-021-22030-5
Entities
People
- Alexander P. M. Place
- Andras Gyenis
- Andrei Vrajitoarea
- Andrew Houck
- Anjali Premkumar
- Basil M. Smitham
- Berthold Jäck
- Guangming Cheng
- Harshvardhan K. Babla
- Jacob Bryon
- Lila V. H. Rodgers
- Mattias Fitzpatrick
- Nan Yao
- Nathalie P de Leon
- Pranav Mundada
- Robert Cava
- Sara Sussman
- Trisha Madhavan
- Xuan Hoang Le
- Youqi Gang
- Zhaoqi Leng
Organizations
- Army Research Office
- Intelligence Community Postdoctoral Research Fellowship Program
- National Science Foundation