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Related Experiment Videos

Quantum logic gates for coupled superconducting phase qubits.

Frederick W Strauch1, Philip R Johnson, Alex J Dragt

  • 1Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA. fstrauch@physics.umd.edu

Physical Review Letters
|November 13, 2003
PubMed
Summary
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Researchers propose two fundamental two-qubit quantum logic gates based on Josephson junctions. These gates, combined with single-qubit operations, enable universal quantum computation with high fidelity.

Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum information science

Background:

  • Josephson junctions are key components in quantum computing architectures.
  • Controlling quantum states in multi-qubit systems is crucial for scalable quantum computation.

Purpose of the Study:

  • To propose novel two-qubit quantum logic gates using capacitively coupled Josephson junctions.
  • To demonstrate the feasibility of universal quantum computation with these gates.

Main Methods:

  • Quantum analysis of two capacitively coupled current-biased Josephson junctions.
  • Numerical solutions of the time-dependent Schrödinger equation.

Main Results:

  • Two fundamental two-qubit quantum logic gates were theoretically proposed.

Related Experiment Videos

  • The proposed gates, with single-qubit operations, are sufficient for universal quantum computation.
  • Numerical simulations confirm high-fidelity gate operations.

    • Conclusions:

    • Capacitively coupled Josephson junctions offer a promising platform for implementing universal quantum computation.
    • The proposed gates represent a significant step towards building practical quantum computers.