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Related Experiment Videos

Decoherence in superconducting quantum bits by phonon radiation.

L B Ioffe1, V B Geshkenbein, Ch Helm

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.

Physical Review Letters
|August 25, 2004
PubMed
Summary
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Superconducting quantum bits face decoherence due to phonon radiation from Josephson junctions. This radiation, caused by the piezoelectric effect, limits quantum bit coherence times.

Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconducting quantum bits (qubits) are promising for quantum computation.
  • Coherent operation of qubits is crucial for reliable quantum information processing.
  • Josephson junctions are key components in superconducting qubits.

Purpose of the Study:

  • To identify a fundamental limitation in the coherent operation of superconducting qubits.
  • To investigate the role of phonon radiation from Josephson junctions in qubit decoherence.

Main Methods:

  • Theoretical analysis of phonon radiation generated in Josephson junctions.
  • Calculation of the electric field coupling to the crystal lattice via the piezoelectric effect.
  • Determination of the radiation resistance of the junction due to phonon emission.

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Main Results:

  • Phonon radiation from Josephson junctions imposes a fundamental limitation on qubit coherence.
  • The piezoelectric effect mediates the coupling between the superconducting phase and the crystal lattice.
  • Derived decoherence rates are substantial and consistent with experimental observations.

Conclusions:

  • Phonon radiation is a significant source of decoherence in superconducting qubits.
  • Understanding and mitigating this effect is essential for advancing quantum computing.
  • The findings provide a theoretical basis for experimental quality factor measurements.