Benevides R, Drimmer M, Bisson G, Adinolfi F, Lüpke U V, Doeleman H M, Catelani G, Chu Y
Department of Physics, <a href="https://ror.org/05a28rw58">ETH Zürich</a>, 8093 Zürich, Switzerland.
Quantum Center, <a href="https://ror.org/05a28rw58">ETH Zürich</a>, 8093 Zürich, Switzerland.
Phys Rev Lett. 2024 Aug 9;133(6):060602. doi: 10.1103/PhysRevLett.133.060602.
A known source of decoherence in superconducting qubits is the presence of broken Cooper pairs, or quasiparticles. These can be generated by high-energy radiation, either present in the environment or purposefully introduced, as in the case of some hybrid quantum devices. Here, we systematically study the properties of a transmon qubit under illumination by focused infrared radiation with various powers, durations, and spatial locations. Despite the high energy of incident photons, our observations agree well with a model of low-energy quasiparticle dynamics dominated by trapping. This technique can be used for understanding and potentially mitigating the effects of high-energy radiation on superconducting circuits with a variety of geometries and materials.
超导量子比特中一个已知的退相干源是库珀对破裂或准粒子的存在。这些准粒子可由环境中存在的或如某些混合量子器件那样有意引入的高能辐射产生。在此，我们系统地研究了一个跨导量子比特在不同功率、持续时间和空间位置的聚焦红外辐射照射下的特性。尽管入射光子能量很高，但我们的观察结果与以俘获为主的低能准粒子动力学模型非常吻合。该技术可用于理解并有可能减轻高能辐射对具有各种几何形状和材料的超导电路的影响。
