Shot Noise of a Quantum Dot Measured with Gigahertz Impedance Matching

Hasler, T. and Jung, M. and Ranjan, V. and Puebla-Hellmann, G. and Wallraff, A. and Schönenberger, C.. (2015) Shot Noise of a Quantum Dot Measured with Gigahertz Impedance Matching. Physical review applied, 4. 054002.

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Official URL: http://edoc.unibas.ch/41333/

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The demand for a fast high-frequency read-out of high impedance devices, such as quantum dots, necessitates impedance matching. Here we use a resonant impedance matching circuit (a stub tuner) realized by on-chip superconducting transmission lines to measure the electronic shot noise of a carbon nanotube quantum dot at a frequency close to 3 GHz in an efficient way. As compared to wide-band detection without impedance matching, the signal to noise ratio can be enhanced by as much as a factor of 800 for a device with an impedance of 100 kΩ. The advantage of the stub resonator concept is the ease with which the response of the circuit can be predicted, designed and fabricated. We further demonstrate that all relevant matching circuit parameters can reliably be deduced from power reflectance measurements and then used to predict the power transmission function from the device through the circuit. The shot noise of the carbon nanotube quantum dot in the Coulomb blockade regime shows an oscillating suppression below the Schottky value of 2eI, as well an enhancement in specific regions.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Hasler, Thomas and Jung, Minkyung and Ranjan, Vishal and Schönenberger, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:02
Deposited On:12 May 2016 10:10

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