Global relaxation of superconducting qubits

T. Ojanen (Corresponding Author), Antti Niskanen, Y. Nakamura, A. A. Abdumalikov Jr.

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8 Citations (Scopus)

Abstract

We consider coupled quantum two-state systems (qubits) exposed to a global relaxation process. The global relaxation refers to the assumption that qubits are coupled to the same quantum bath with approximately equal strengths, appropriate for long-wavelength environmental fluctuations. We show that interactions do not spoil the picture of Dicke’s subradiant and super-radiant states where quantum interference effects lead to striking deviations from the independent relaxation picture. Remarkably, the system possess a stable entangled state and a state decaying faster than single qubit excitations. We propose a scheme for how these effects can be experimentally accessed in superconducting flux qubits and, possibly, used in constructing long-lived entangled states.
Original languageEnglish
Article number100505
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume76
Issue number10
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • quantum computing
  • quantum entanglement
  • quantum interference phenomena
  • superconductivity
  • Josephson junction
  • Josephson devices
  • qubits

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    Ojanen, T., Niskanen, A., Nakamura, Y., & Abdumalikov Jr., A. A. (2007). Global relaxation of superconducting qubits. Physical Review B: Condensed Matter and Materials Physics, 76(10), [100505]. https://doi.org/10.1103/PhysRevB.76.100505