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Related Experiment Videos

Variable electrostatic transformer: controllable coupling of two charge qubits.

D V Averin1, C Bruder

  • 1Department of Physics and Astronomy, University of Stony Brook, SUNY, Stony Brook, New York 11794-3800, USA.

Physical Review Letters
|August 9, 2003
PubMed
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We introduce a new method for controlling the coupling between two Josephson charge qubits using a tunable electrostatic transformer. This technique allows for positive, negative, or zero coupling, enabling precise quantum operations.

Area of Science:

  • Quantum Computing
  • Solid State Physics
  • Superconductivity

Background:

  • Josephson junctions are fundamental to superconducting quantum computing.
  • Controlling qubit-qubit interactions is crucial for building scalable quantum processors.
  • Existing coupling methods often lack fine-tuning capabilities.

Purpose of the Study:

  • To propose and investigate a novel method for controlled coupling of two Josephson charge qubits.
  • To demonstrate tunable coupling strengths (positive, negative, zero) via a variable electrostatic transformer.
  • To explore the implementation of a phase gate using this controllable coupling.

Main Methods:

  • Utilizing a variable electrostatic transformer to mediate qubit coupling.
  • Defining coupling capacitance based on the discretized curvature of a Josephson junction's lowest energy band.

Related Experiment Videos

  • Calculating the charging diagram of the two-qubit system to observe coupling transitions.

    • Main Results:

    • The coupling capacitance can be precisely controlled to be positive, negative, or zero.
    • The charging diagram reveals transitions between positive, negative, and vanishing coupling.
    • A feasible method for implementing a phase gate using the controllable coupling is discussed.

    Conclusions:

    • The proposed method offers a novel way to achieve tunable coupling between Josephson charge qubits.
    • This controllability is essential for advanced quantum gate operations and scalable quantum computing architectures.
    • The findings pave the way for more sophisticated control in superconducting quantum systems.