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Related Experiment Videos

Strong tunable coupling between a superconducting charge and phase qubit.

A Fay1, E Hoskinson, F Lecocq

  • 1Institut Néel, C.N.R.S.-Université Joseph Fourier, BP 166, 38042 Grenoble-cedex 9, France.

Physical Review Letters
|June 4, 2008
PubMed
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We achieved tunable coupling between a Cooper pair transistor (charge qubit) and a DC SQUID (phase qubit), enabling independent control and entanglement. This allows for precise quantum state manipulation and measurement via adiabatic quantum transfer.

Area of Science:

  • Quantum computing
  • Solid-state physics
  • Superconductivity

Background:

  • Quantum bits (qubits) are fundamental to quantum computation.
  • Controlling and entangling qubits is crucial for building quantum processors.
  • Superconducting circuits offer a promising platform for qubit implementation.

Purpose of the Study:

  • To realize and investigate tunable coupling between a charge qubit and a phase qubit.
  • To demonstrate independent manipulation and entanglement of these two distinct superconducting qubits.
  • To validate the coupling mechanism with theoretical predictions.

Main Methods:

  • Fabrication of a circuit integrating an asymmetric Cooper pair transistor (charge qubit) and a DC SQUID (phase qubit).
  • Implementation of independent control protocols for each qubit's quantum state.

Related Experiment Videos

  • Utilizing adiabatic quantum transfer for charge qubit state measurement via the phase qubit.
  • Characterization of the tunable coupling strength, including capacitive and Josephson components.

    • Main Results:

    • Achieved tunable coupling between the charge and phase qubits over a broad frequency range.
    • Demonstrated independent manipulation of individual qubit states.
    • Successfully entangled the two qubits.
    • Measured coupling strength agrees with analytical theory incorporating both capacitive and tunable Josephson couplings.

    Conclusions:

    • The developed circuit architecture allows for flexible and tunable coupling between different types of superconducting qubits.
    • Independent control and entanglement capabilities are essential for scalable quantum computing architectures.
    • The theoretical model accurately describes the observed coupling phenomena, providing a foundation for future circuit design.