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Updated: Jun 15, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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Quasiparticle Dynamics in a Superconducting Qubit Irradiated by a Localized Infrared Source
R Benevides1,2, M Drimmer1,2, G Bisson1,2
1Department of Physics, <a href="https://ror.org/05a28rw58">ETH Zürich</a>, 8093 Zürich, Switzerland.
Physical Review Letters
|August 23, 2024
Summary
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.
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.
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