Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact

Autor:	Cassidy, M. C., Dzurak, A. S., Clark, R. G., Petersson, K. D., Farrer, I., Ritchie, D. A., Smith, C. G.
Rok vydání:	2009
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Applied Physics Letters, 91, 222104 (2007)
Druh dokumentu:	Working Paper
DOI:	10.1063/1.2809370
Popis:	We report on charge sensing measurements of a GaAs semiconductor quantum dot device using a radio frequency quantum point contact (rf-QPC). The rf-QPC is fully characterized at 4 K and milli-Kelvin temperatures and found to have a bandwidth exceeding 20 MHz. For single-shot charge sensing we achieve a charge sensitivity of 2x10^-4 e/(sqrt)Hz referred to the neighboring dot's charge. The rf-QPC compares favorably with rf-SET electrometers and promises to be an extremely useful tool for characterizing and measuring semiconductor quantum systems on fast timescales. Comment: 4 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0907.1010 Zobrazit plný text záznamu View this record from Arxiv