Spatially Resolved Optical Responses of a Superconducting Nanowire Microwave Resonator

Rento Hirotsuru; Hodaka Kurokawa; Kazuyo Takaki; Hirotaka Terai; Hideo Kosaka

doi:10.1103/fnfl-xjrz

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Spatially Resolved Optical Responses of a Superconducting Nanowire Microwave Resonator

Rento Hirotsuru, Hodaka Kurokawa, Kazuyo Takaki, Hirotaka Terai, Hideo Kosaka

DOI 10.1103/fnfl-xjrz · Physical Review Letters

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Abstract

Understanding the optical response of a superconducting microwave resonator is crucial for applications ranging from single-photon detection to quantum transduction between the microwave and optical domains. This topic is gaining significant attention for scaling up quantum computers. However, interactions between the pump light and superconducting resonators often induce unintended resonance frequency shifts and linewidth broadening. In this study, we measure the local optical response of a NbTiN nanowire resonator using a laser-scanning microwave spectroscopy system integrated with a dilution refrigerator. The optical response of the resonator correlates with the resonance modes and position, which we attribute to interactions between two-level systems (TLSs) and laser-induced phonons. These findings establish the TLS-phonon interactions as the dominant mechanism underlying laser-induced resonance variations, providing critical insights for the design and optimization of quantum transducers and superconducting single-photon detectors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbTiN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown