Frequency Comb Generation in Superconducting Resonators
R. P. Erickson, M. R. Vissers, M. Sandberg, S. R. Jefferts, D. P. Pappas
DOI 10.1103/PhysRevLett.113.187002 · Physical Review Letters
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Abstract
We have generated frequency combs spanning 0.5 to 20 GHz in superconducting λ/2 resonators at T=3 K. Thin films of niobium-titanium nitride enabled this development due to their low loss, high nonlinearity, low frequency dispersion, and high critical temperature. The combs nucleate as sidebands around multiples of the pump frequency. Selection rules for the allowed frequency emission are calculated using perturbation theory, and the measured spectrum is shown to agree with the theory. Sideband spacing is measured to be accurate to 1 part in 108. The sidebands coalesce into a continuous comb structure observed to cover at least several frequency octaves.
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. | 13 | Pressure not reported | unknown |
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