Measurement Back-Action in Quantum Point-Contact Charge Sensing
Name
Kung-2010-Measurement Back-Action in Quantum Point-Contact.pdf
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1.56 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Küng, Bruno
Gustavsson, Simon
Choi, Theodore
Shorubalko, Ivan
Pfäffli, Oliver
Hassler, Fabian
Blatter, Gianni
Reinwald, Matthias
Wegscheider, Werner
Schön, Silke
Date Issued
June 2010
Journal
Entropy
Publisher
MDPI Publishing
Citation
Küng, Bruno et al. “Measurement Back-Action in Quantum Point-Contact Charge Sensing.” Entropy 12 (2010): 1721-1732. Web. 19 Oct. 2011. © 2011 MDPI Publishing
Version
Final published version
Abstract
Charge sensing with quantum point-contacts (QPCs) is a technique widely used in semiconductor quantum-dot research. Understanding the physics of this measurement process, as well as finding ways of suppressing unwanted measurement back-action, are therefore both desirable. In this article, we present experimental studies targeting these two goals. Firstly, we measure the effect of a QPC on electron tunneling between two InAs quantum dots, and show that a model based on the QPC’s shot-noise can account for it. Secondly, we discuss the possibility of lowering the measurement current (and thus the back-action) used for charge sensing by correlating the signals of two independent measurement channels. The performance of this method is tested in a typical experimental setup.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.3390/e12071721
