Tunable frequency conversion and comb generation with a superconducting artificial atom
Journal article, 2026
We investigate the power spectral density emitted by a superconducting artificial atom coupled to the end of a semi-infinite transmission line and driven by two continuous radio frequency fields. In this setup, we observe the generation of multiple frequency peaks and the formation of frequency combs with equal detuning between those peaks. The frequency peaks originate from wave mixing of the drive fields, mediated by the artificial atom, highlighting the potential of this system as both a frequency converter and a frequency-comb generator. We demonstrate precise control and tunability in generating these frequency features, aligning well with theoretical predictions, across a relatively wide frequency range (tens of MHz, exceeding the linewidth of the artificial atom). The extensive and simple tunability of this frequency converter and comb generator, combined with its small physical footprint, makes it promising for quantum optics on chips and other applications in quantum technology.
Author
F. Aziz
National Tsing Hua University
City University of Hong Kong
Z. Q. Niu
Chinese Academy of Sciences
Tzu Yen Hsieh
National Taiwan University
K. T. Lin
Foxconn
Y. H. Huang
National Tsing Hua University
Yen Hsiang Lin
National Tsing Hua University
Ching Yeh Chen
National Tsing Hua University
Yu Ting Cheng
City University of Hong Kong
K. M. Hsieh
City University of Hong Kong
J. C. Chen
National Tsing Hua University
Anton Frisk Kockum
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
G. D. Lin
National Center for Theoretical Sciences (NCTS)
Foxconn
National Taiwan University
Z. R. Lin
Chinese Academy of Sciences
P. Y. Wen
National Chung Cheng University
Io Chun Hoi
City University of Hong Kong
National Tsing Hua University
Applied Physics Letters
0003-6951 (ISSN) 1077-3118 (eISSN)
Vol. 129 1 014002Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
DOI
10.1063/5.0310058