The flux qubit revisited to enhance coherence and reproducibility

Fei Yan, Simon Gustavsson, Archana Kamal, Jeffrey Birenbaum, Adam P Sears, David Hover, Ted J. Gudmundsen, Danna Rosenberg, Gabriel Samach, S Weber, Jonilyn L. Yoder, Terry P. Orlando, John Clarke, Andrew J. Kerman and William D. Oliver ()
Additional contact information
Fei Yan: Research Laboratory for Electronics, Massachusetts Institute of Technology
Simon Gustavsson: Research Laboratory for Electronics, Massachusetts Institute of Technology
Archana Kamal: Research Laboratory for Electronics, Massachusetts Institute of Technology
Jeffrey Birenbaum: University of California
Adam P Sears: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
David Hover: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
Ted J. Gudmundsen: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
Danna Rosenberg: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
Gabriel Samach: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
S Weber: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
Jonilyn L. Yoder: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
Terry P. Orlando: Research Laboratory for Electronics, Massachusetts Institute of Technology
John Clarke: University of California
Andrew J. Kerman: MIT Lincoln Laboratory, Quantum Information and Integrated Nanosystems Group
William D. Oliver: Research Laboratory for Electronics, Massachusetts Institute of Technology

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract The scalable application of quantum information science will stand on reproducible and controllable high-coherence quantum bits (qubits). Here, we revisit the design and fabrication of the superconducting flux qubit, achieving a planar device with broad-frequency tunability, strong anharmonicity, high reproducibility and relaxation times in excess of 40 μs at its flux-insensitive point. Qubit relaxation times T1 across 22 qubits are consistently matched with a single model involving resonator loss, ohmic charge noise and 1/f-flux noise, a noise source previously considered primarily in the context of dephasing. We furthermore demonstrate that qubit dephasing at the flux-insensitive point is dominated by residual thermal-photons in the readout resonator. The resulting photon shot noise is mitigated using a dynamical decoupling protocol, resulting in T2≈85 μs, approximately the 2T1 limit. In addition to realizing an improved flux qubit, our results uniquely identify photon shot noise as limiting T2 in contemporary qubits based on transverse qubit–resonator interaction.

Date: 2016
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DOI: 10.1038/ncomms12964

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