Low-decoherence flux qubit

J. Q. You, Xuedong Hu, S. Ashhab, Franco Nori

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97 Citations (Scopus)


A flux qubit can have a relatively long decoherence time at the degeneracy point, but away from this point the decoherence time is greatly reduced by dephasing. This limits the practical applications of flux qubits. Here we propose a qubit design modified from the commonly used flux qubit by introducing an additional capacitor shunted in parallel to the smaller Josephson junction (JJ) in the loop. Our results show that the effects of noise can be considerably suppressed, particularly away from the degeneracy point, by both reducing the coupling energy of the JJ and increasing the shunt capacitance. This shunt capacitance provides a novel way to improve the qubit.

Original languageEnglish
Article number140515
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 27 Apr 2007


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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