title: Coexistence of three-wave, four-wave, and five-wave mixing processes in a superconducting artificial atom.
abstract: We present a theoretical study of multiwave mixing in a driven superconducting quantum qubit (artificial atom) with a cyclic Ξ-type three-level structure. We first show that three-wave mixing (3WM), four-wave mixing (4WM), and five-wave mixing (5WM) processes can coexist in the microwave regime in such an artificial system due to the absence of selection rules. Because of electromagnetically induced transparency suppression of linear absorption in a standard Ξ-type configuration, the generated 4WM is enhanced greatly and its efficiency can be as high as 0.1% for only a single artificial atom. We also show that Autler-Townes splitting occurs in the 3WM and 5WM spectra and quantum interference has a significant impact on the total signal intensity being a coherent superposition of these two signals.
authors.forename: Hai-Chao
authors.initials: HC
authors.lastname: Li
authors.forename: Guo-Qin
authors.initials: GQ
authors.lastname: Ge
authors.forename: Hai-Yang
authors.initials: HY
authors.lastname: Zhang