• Open Access

Controllable Coupling between Flux Qubits

Yu-xi Liu, L. F. Wei, J. S. Tsai, and Franco Nori
Phys. Rev. Lett. 96, 067003 – Published 15 February 2006

Abstract

We propose an experimentally realizable method to control the coupling between two flux qubits. In our proposal, the bias fluxes are always fixed for these two inductively coupled qubits. The detuning of these two qubits can be initially chosen to be sufficiently large, so that their initial interbit coupling is almost negligible. When a variable frequency or time-dependent magnetic flux (TDMF) is applied to one of the qubits, a well-chosen frequency of the TDMF can be used to compensate the initial detuning and to couple two qubits. This proposed method avoids fast changes of either qubit frequencies or the amplitudes of the bias magnetic fluxes through the qubit loops, and also offers a remarkable way to implement any logic gate, as well as tomographically measure flux qubit states.

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  • Received 27 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.067003

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

Yu-xi Liu1, L. F. Wei1,2, J. S. Tsai1,3, and Franco Nori1,4

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan
  • 2IQOQI, Department of Physics, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China
  • 3NEC Fundamental Research Laboratories, Tsukuba Ibaraki 305-8501, Japan
  • 4MCTP, Physics Department, CSCS, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Issue

Vol. 96, Iss. 6 — 17 February 2006

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