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Related Experiment Videos

Controllable coupling between flux qubits.

Yu-xi Liu1, L F Wei, J S Tsai

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan.

Physical Review Letters
|April 12, 2006
PubMed
Summary
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We present a method to control flux qubit coupling using time-dependent magnetic flux (TDMF). This technique enables tunable qubit interactions and facilitates quantum gate implementation for flux qubits.

Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Flux qubits are a leading platform for superconducting quantum computing.
  • Controlling inter-qubit coupling is essential for building scalable quantum processors.
  • Existing methods often require complex flux or frequency manipulations.

Purpose of the Study:

  • To propose a novel, experimentally feasible method for controlling the coupling between two flux qubits.
  • To enable tunable interactions without altering qubit frequencies or bias fluxes.
  • To facilitate the implementation of quantum gates and state measurements.

Main Methods:

  • Utilizing inductively coupled flux qubits with initially large detuning.
  • Applying a time-dependent magnetic flux (TDMF) to one qubit.

Related Experiment Videos

  • Tuning the TDMF frequency to compensate for detuning and induce coupling.

    • Main Results:

    • Demonstrated a method to controllably couple two flux qubits.
    • Achieved coupling by compensating initial detuning with a specific TDMF frequency.
    • Avoided rapid changes in qubit frequencies or bias flux amplitudes.

    Conclusions:

    • The proposed TDMF method offers a robust way to control flux qubit coupling.
    • This technique is compatible with implementing arbitrary single- and two-qubit gates.
    • It provides a pathway for efficient quantum state tomography of flux qubits.