Quantum Information Processing

, Volume 8, Issue 2–3, pp 217–243

Decoherence in rf SQUID qubits

  • Douglas A. Bennett
  • Luigi Longobardi
  • Vijay Patel
  • Wei Chen
  • Dmitri V. Averin
  • James E. Lukens
Article

DOI: 10.1007/s11128-009-0099-8

Cite this article as:
Bennett, D.A., Longobardi, L., Patel, V. et al. Quantum Inf Process (2009) 8: 217. doi:10.1007/s11128-009-0099-8

Abstract

We report measurements of coherence times of an rf SQUID qubit using pulsed microwaves and rapid flux pulses. The modified rf SQUID, described by an double-well potential, has independent, in situ, controls for the tilt and barrier height of the potential. The decay of coherent oscillations is dominated by the lifetime of the excited state and low frequency flux noise and is consistent with independent measurement of these quantities obtained by microwave spectroscopy, resonant tunneling between fluxoid wells and decay of the excited state. The oscillation’s waveform is compared to analytical results obtained for finite decay rates and detuning and averaged over low frequency flux noise.

Keywords

Decoherence Superconducting qubits Flux qubit SQUIDs 

PACS

03.67.Lx 85.125.Cp 03.65.Yz 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Douglas A. Bennett
    • 1
  • Luigi Longobardi
    • 1
  • Vijay Patel
    • 1
  • Wei Chen
    • 1
  • Dmitri V. Averin
    • 1
  • James E. Lukens
    • 1
  1. 1.Department of Physics and AstronomyStony Brook UniversityStony BrookUSA

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