We report a method to characterize the potential barrier of a dynamic quantum dot by measuring the barrier height and determining the curvature. We show that the loading statistics and hence accuracy of electron transfer through the dynamic quantum dot depend significantly on these parameters, and hence our method provides a detailed characterization of device performance. This method takes a further step towards tunable barrier shapes, which would greatly increase the accuracy of single electron sources, allowing the single electron current to be useful for quantum sensing, quantum information, and metrology. We apply our method to the case of a tunable-barrier single-electron pump, an exemplary device that shows promise as a source of hot single electron wavepackets.
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14 October 2019
Research Article|
October 15 2019
Measurement of the curvature and height of the potential barrier for a dynamic quantum dot
N. Johnson
;
N. Johnson
a)
NTT Basic Research Laboratories, NTT Corporation
, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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G. Yamahata
;
G. Yamahata
NTT Basic Research Laboratories, NTT Corporation
, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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A. Fujiwara
A. Fujiwara
NTT Basic Research Laboratories, NTT Corporation
, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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Appl. Phys. Lett. 115, 162103 (2019)
Article history
Received:
July 19 2019
Accepted:
October 02 2019
Citation
N. Johnson, G. Yamahata, A. Fujiwara; Measurement of the curvature and height of the potential barrier for a dynamic quantum dot. Appl. Phys. Lett. 14 October 2019; 115 (16): 162103. https://doi.org/10.1063/1.5120585
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