An in-situ tunable radio-frequency quantum point contact

Details An in-situ tunable radio-frequency quantum point contact An in-situ tunable radio-frequency quantum point contact

2010-09-09

arxiv.org/abs/1009.1746v2

Appl. Phys. Lett. 97, 202104 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1063/1.3517483

Incorporating a variable capacitance diode into a radio-frequency matching circuit allows us to in-situ tune the resonance frequency of an RF quantum point contact, increasing the versatility of the latter as a fast charge sensor of a proximal quantum circuit. The performance of this method is compared in detail to conventional low-frequency charge detection. The approach is also applicable to other RF-detection schemes, such as RF-SET circuits.

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