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Spectroscopy of superconducting charge qubits coupled by a Josephson inductance

Research output: Contribution to journalJournal article

Published

  • T. Yamamoto
  • M. Watanabe
  • J. Q. You
  • Yuri Pashkin
  • O. Astafiev
  • Y. Nakamura
  • F. Nori
  • J. S. Tsai
Article number064505
Journal publication date02/2008
JournalPhysical Review B
Journal number6
Volume77
Number of pages8
Pages-
Original languageEnglish

Abstract

We have designed and experimentally implemented a circuit of inductively coupled superconducting charge qubits, where a Josephson junction is used as an inductance, and the coupling between the qubits is controlled by an applied magnetic flux. Spectroscopic measurements on the circuit are in good agreement with theoretical calculations. We observed anticrossings which originate from the coupling between the qubit and the plasma mode of the Josephson junction. Moreover, the size of the anticrossing depends on the external magnetic flux, which demonstrates the controllability of the coupling.