• Open Access

Hybridized solid-state qubit in the charge-flux regime

J. Q. You, J. S. Tsai, and Franco Nori
Phys. Rev. B 73, 014510 – Published 11 January 2006

Abstract

Most superconducting qubits operate in a regime dominated by either the electrical charge or the magnetic flux. Here we study an intermediate case: a hybridized charge-flux qubit with a third Josephson junction (JJ) added into the superconducting quantum interference device loop of the Cooper-pair box. This additional JJ allows the optimal design of a low-decoherence qubit. Both charge and flux 1f noises are considered. Moreover, we show that an efficient quantum measurement of either the current or the charge can be achieved by using different area sizes for the third JJ.

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  • Received 2 September 2004

DOI:https://doi.org/10.1103/PhysRevB.73.014510

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Authors & Affiliations

J. Q. You1,2, J. S. Tsai1,3, and Franco Nori1,4

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan
  • 2Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China
  • 3NEC Fundamental and Environmental Research Laboratories, Tsukuba, Ibaraki 305-8051, Japan
  • 4Center for Theoretical Physics, Physics Department, Center for the Study of Complex Systems, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Vol. 73, Iss. 1 — 1 January 2006

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