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Accurate Real-Time Monitoring of Quality Factor and Center Frequency of Superconducting Resonators

Sebastian Erik de Graaf (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Andrey Danilov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
IEEE transactions on applied superconductivity (1051-8223). Vol. 24 (2014), 6,
[Artikel, refereegranskad vetenskaplig]

In this paper, we track both center frequency and quality factor of a superconducting microwave resonator with very high precision using a modified Pound-Drever-Hall frequency locking scheme. The quality factor measurements can be done with high enough bandwidth to study different processes in a superconducting resonator in real time. With this added functionality, the frequency readout remains unaffected, with typical accuracy around 10-30 Hz/root Hz, whereas the cavity loss rate can be determined to within 0.1% on a millisecond time scale (34 dB/root Hz). As we demonstrate, this can be particularly useful for electron spin resonance measurements, where we achieve a minimum number of detectable spins coupled to the resonator N = 5 . 10(5) spins/root Hz, based on quality factor measurements. It also enables the study of fast dynamic processes, for example, vortex dynamics, in these devices on a short time scale.

Nyckelord: Electron spin resonance (ESR), Pound-Drever-Hall (PDH) locking, superconducting microwave resonators

Denna post skapades 2014-10-16. Senast ändrad 2016-07-06.
CPL Pubid: 204366


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik


Elektroteknik och elektronik

Chalmers infrastruktur



Denna publikation är ett resultat av följande projekt:

ELectric Field control Over Spin molecules (ELFOS) (EC/FP7/270369)