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Abstract
© 2016 Author(s).
In the context of engineered quantum systems, there is a demand for superconducting tunable devices, able to operate with high-quality factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave re-entrant cavity with such characteristics ready to provide a very fine-tuning of a high-Q resonant mode over a large dynamic range. This system has an electronic tuning mechanism based on a mechanically amplified piezoelectric actuator, which controls the resonator dominant mode frequency by changing the cavity narrow gap by very small displacements. Experiments were conducted at room and dilution refrigerator temperatures showing a large dynamic range up to 4 GHz and 1 GHz, respectively, and were compared to a finite element method model simulated data. At elevated microwave power input, nonlinear thermal effects were observed to destroy the superconductivity of the cavity due to the large electric fields generated in the small gap of the re-entrant cavity.
In the context of engineered quantum systems, there is a demand for superconducting tunable devices, able to operate with high-quality factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave re-entrant cavity with such characteristics ready to provide a very fine-tuning of a high-Q resonant mode over a large dynamic range. This system has an electronic tuning mechanism based on a mechanically amplified piezoelectric actuator, which controls the resonator dominant mode frequency by changing the cavity narrow gap by very small displacements. Experiments were conducted at room and dilution refrigerator temperatures showing a large dynamic range up to 4 GHz and 1 GHz, respectively, and were compared to a finite element method model simulated data. At elevated microwave power input, nonlinear thermal effects were observed to destroy the superconductivity of the cavity due to the large electric fields generated in the small gap of the re-entrant cavity.
| Original language | English |
|---|---|
| Article number | 094702 |
| Pages (from-to) | 094702-1 - 094702-4 |
| Journal | Review of Scientific Instruments |
| Volume | 87 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Sept 2016 |
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ARC Centre of Excellence for Engineered Quantum Systems EQuS
Milburn, G. (Investigator 01), White, A. (Investigator 02), Doherty, A. (Investigator 03), Tobar, M. (Investigator 04), Twamley, J. (Investigator 05), Bartlett, S. (Investigator 06), Biercuk, M. (Investigator 07), Bowen, W. (Investigator 08), Brennan, G. (Investigator 09), Duty, T. (Investigator 10), Gilchrist, A. (Investigator 11), Molina-Terriza, G. (Investigator 12), Rabeau, J. (Investigator 13), Reilly, D. (Investigator 14), Rubinsztein-Dunlop, H. (Investigator 15), Stace, T. (Investigator 16) & Vidal, G. (Investigator 17)
ARC Australian Research Council
1/01/11 → 31/12/17
Project: Research