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Quasiparticle Dynamics in a Superconducting Qubit Irradiated by a Localized Infrared Source.

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Broken Cooper pairs cause decoherence in superconducting qubits. This study shows infrared radiation effects on transmon qubits align with low-energy quasiparticle trapping models, aiding radiation mitigation strategies.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics

Background:

  • Decoherence in superconducting qubits is a major challenge.
  • Broken Cooper pairs (quasiparticles) are a known source of decoherence.
  • High-energy radiation can generate these quasiparticles.

Purpose of the Study:

  • To systematically study the impact of infrared radiation on transmon qubit properties.
  • To investigate quasiparticle dynamics under controlled illumination.
  • To validate models for understanding radiation effects in superconducting circuits.

Main Methods:

  • Illumination of a transmon qubit with focused infrared radiation.
  • Systematic variation of radiation power, duration, and spatial location.
  • Comparison of experimental observations with theoretical models of quasiparticle dynamics.

Main Results:

  • Observed qubit properties under infrared radiation.
  • Demonstrated agreement between experimental data and a low-energy quasiparticle trapping model.
  • Quantified the influence of radiation parameters on qubit decoherence.

Conclusions:

  • Low-energy quasiparticle dynamics, particularly trapping, dominate the effects of infrared radiation on transmon qubits.
  • The study provides a technique for understanding and potentially mitigating radiation-induced decoherence.
  • Findings are applicable to various superconducting circuit geometries and materials.