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Related Experiment Videos

Quasiparticle decoherence in d-wave superconducting qubits.

M H S Amin1, A Yu Smirnov

  • 1D-Wave Systems Inc, 320-1985 W Broadway, Vancouver, British Columbia, Canada V6J 4Y3.

Physical Review Letters
|February 3, 2004
PubMed
Summary
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The presence of gapless quasiparticles in d-wave superconductors does not necessarily prevent observable quantum effects in qubits. Our research shows that quantum behavior can be detected in d-wave junctions under specific conditions.

Area of Science:

  • Condensed Matter Physics
  • Quantum Computing

Background:

  • D-wave superconducting qubits are theoretically susceptible to decoherence from gapless quasiparticle excitations.
  • This decoherence is often presumed to make quantum effects in such systems unobservable.

Purpose of the Study:

  • To investigate the impact of quasiparticle excitations on d-wave qubit decoherence.
  • To determine if quantum effects can be observed in d-wave superconducting junctions.

Main Methods:

  • Utilizing a self-consistent linear response nonequilibrium quasiclassical formalism.
  • Analyzing the phase dependence of quasiparticle conductance in d-wave grain boundary junctions.

Main Results:

  • Quasiparticle conductance in d-wave grain boundary junctions is strongly phase dependent.

Related Experiment Videos

  • Both midgap states and nodal quasiparticles contribute to conductance and decoherence.
  • Quantum behavior is predicted to be detectable in d-wave junctions with optimized parameters.

    • Conclusions:

    • The presence of gapless quasiparticles does not inherently preclude observable quantum effects in d-wave qubits.
    • Careful parameter selection for d-wave junctions can mitigate decoherence and allow for quantum behavior detection.