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Related Experiment Videos

Solid-state qubits with current-controlled coupling.

T Hime1, P A Reichardt, B L T Plourde

  • 1Department of Physics, University of California, Berkeley, CA 94720-7300, USA.

Science (New York, N.Y.)
|December 2, 2006
PubMed
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Researchers demonstrated controllable switching of quantum bit (qubit) coupling. This essential capability for quantum computing was achieved by manipulating the dynamic inductance of a superconducting quantum interference device (SQUID).

Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Solid State Physics

Background:

  • Controlling qubit-qubit interactions is crucial for executing quantum algorithms.
  • Existing methods for qubit coupling often lack precise on/off control.
  • Flux qubits offer a promising platform for quantum computation.

Purpose of the Study:

  • To demonstrate a method for dynamically switching the coupling between two flux qubits.
  • To achieve precise control over the coupling strength, including turning it to zero and reversing its sign.
  • To leverage the properties of a superconducting quantum interference device (SQUID) for coupling modulation.

Main Methods:

  • Utilized two flux qubits coupled via mutual inductance.
  • Employed a dc superconducting quantum interference device (SQUID) for readout and coupling control.

Related Experiment Videos

  • Applied a bias current to the SQUID in its zero-voltage state to alter dynamic inductance.

    • Main Results:

    • Successfully demonstrated the ability to switch qubit coupling on and off.
    • Showcased controllable reduction of coupling energy to zero.
    • Observed a sign reversal of the coupling energy through dynamic inductance modulation.

    Conclusions:

    • The demonstrated method provides essential on/off control for qubit coupling.
    • This technique is vital for the implementation of advanced quantum computing algorithms.
    • Dynamic inductance modulation via SQUID bias current offers a robust control mechanism for qubit interactions.