Physics – Quantum Physics
Scientific paper
2011-05-23
Phys. Rev. Lett. 107, 240501 (2011)
Physics
Quantum Physics
5 pages, 3 figures, 1 table. Accepted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.107.240501
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 $T_2 \sim 10 \mu$s to $20 \mu$s without the use of spin echo, and highly stable, showing no evidence for $1/f$ critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few $10^{-4}$, approaching the error correction threshold.
Bishop Lev S.
Catelani Gianluigi
Devoret Michel H.
Frunzio Luigi
Girvin Steven M.
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