Measurement Back-Action in Quantum Point-Contact Charge Sensing
Author(s)Küng, Bruno; Gustavsson, Simon; Choi, Theodore; Shorubalko, Ivan; Pfäffli, Oliver; Hassler, Fabian; Blatter, Gianni; Reinwald, Matthias; Wegscheider, Werner; Schön, Silke; Ihn, Thomas; Ensslin, Klaus; ... Show more Show less
MetadataShow full item record
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.
DepartmentMassachusetts Institute of Technology. Research Laboratory of Electronics
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
Final published version