Superconducting circuit protected by two-Cooper-pair tunneling

W. C. Smith, A. Kou, X. Xiao, U. Vool, M. H. Devoret

Research output: Contribution to journalArticlepeer-review


We present a protected superconducting qubit based on an effective circuit element that only allows pairs of Cooper pairs to tunnel. These dynamics give rise to a nearly degenerate ground state manifold indexed by the parity of tunneled Cooper pairs. We show that, when the circuit element is shunted by a large capacitance, this manifold can be used as a logical qubit that we expect to be insensitive to multiple relaxation and dephasing mechanisms.

Original languageEnglish (US)
Article number8
Journalnpj Quantum Information
Issue number1
StatePublished - Jan 21 2020
Externally publishedYes

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Statistical and Nonlinear Physics
  • Computer Networks and Communications
  • Computational Theory and Mathematics


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