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A near-field scanning microwave microscope based on a superconducting resonator for low power measurements

Sebastian Erik de Graaf (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Andrey Danilov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Astghik Adamyan (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Review of Scientific Instruments (0034-6748). Vol. 84 (2013), 2, p. 023706.
[Artikel, refereegranskad vetenskaplig]

We report on the design and performance of a cryogenic (300 mK) near-field scanning microwave microscope. It uses a microwave resonator as the near-field sensor, operating at a frequency of 6 GHz and microwave probing amplitudes down to 100 μV, approaching low enough photon population (N ∼ 1000) of the resonator such that coherent quantum manipulation becomes feasible. The resonator is made out of a miniaturized distributed fractal superconducting circuit that is integrated with the probing tip, micromachined to be compact enough such that it can be mounted directly on a quartz tuning-fork, and used for parallel operation as an atomic force microscope (AFM). The resonator is magnetically coupled to a transmission line for readout, and to achieve enhanced sensitivity we employ a Pound-Drever-Hall measurement scheme to lock to the resonance frequency. We achieve a well localized near-field around the tip such that the microwave resolution is comparable to the AFM resolution, and a capacitive sensitivity down to 6.4 × 10−20 F/rtHz, limited by mechanical noise. We believe that the results presented here are a significant step towards probing quantum systems at the nanoscale using near-field scanning microwave microscopy.

Nyckelord: atomic force microscopy, microwave resonators, near-field scanning optical microscopy, quantum optics, superconducting resonators

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Denna post skapades 2013-02-22. Senast ändrad 2016-07-04.
CPL Pubid: 173988


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Denna publikation är ett resultat av följande projekt:

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