Decoherence in rf SQUID qubits

Decoherence in rf SQUID qubits 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science+Business Media, LLC
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-009-0099-8
Publisher site
See Article on Publisher Site

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.

Journal

Quantum Information ProcessingSpringer Journals

Published: Feb 18, 2009

References

  • Quantum superposition of distinct macroscopic states
    Friedman, J.R.; Patel, V.; Chen, W.; Tolpygo, S.K.; Lukens, J.E.
  • Self-shunted Nb/AlO x /Nb Josephson junctions
    Patel, V.; Lukens, J.
  • Lifetime of metastable voltage states of superconducting tunnel junctions
    Kopietz, P.; Chakravarty, S.
  • Low-frequency noise in dc superconducting quantum interference devices below 1-K
    Wellstood, F.; Urbina, C.; Clarke, J.

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