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The flux qubit revisited to enhance coherence and reproducibility

Yan, Fei ; Gustavsson, Simon ; Kamal, Archana ; Birenbaum, Jeffrey ; Sears, Adam P ; Hover, David ; Gudmundsen, Ted J ; Rosenberg, Danna ; Samach, Gabriel ; Weber, S ; Yoder, Jonilyn L ; Orlando, Terry P ; Clarke, John ; Kerman, Andrew J ; Oliver, William D

Nature communications, 2016-11, Vol.7 (1), p.12964-12964, Article 12964 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    The flux qubit revisited to enhance coherence and reproducibility
  • Autor: Yan, Fei ; Gustavsson, Simon ; Kamal, Archana ; Birenbaum, Jeffrey ; Sears, Adam P ; Hover, David ; Gudmundsen, Ted J ; Rosenberg, Danna ; Samach, Gabriel ; Weber, S ; Yoder, Jonilyn L ; Orlando, Terry P ; Clarke, John ; Kerman, Andrew J ; Oliver, William D
  • Assuntos: Reproducibility
  • É parte de: Nature communications, 2016-11, Vol.7 (1), p.12964-12964, Article 12964
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 T 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 T ≈85 μs, approximately the 2T limit. In addition to realizing an improved flux qubit, our results uniquely identify photon shot noise as limiting T in contemporary qubits based on transverse qubit-resonator interaction.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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