Abstract
Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three-dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. With the new architecture, we demonstrate that Josephson junction qubits are highly coherent, with to without the use of spin echo, and highly stable, showing no evidence for critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few , approaching the error correction threshold.
- Received 3 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.240501
© 2011 American Physical Society
Viewpoint
Superconducting Qubits Are Getting Serious
Published 5 December 2011
When placed inside a 3D electromagnetic cavity, a superconducting qubit can be made potentially more useful because of its large size and long coherence time.
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