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Entropy 2010, 12(7), 1721-1732; doi:10.3390/e12071721
Article

Measurement Back-Action in Quantum Point-Contact Charge Sensing

1,* , 1,2, 1, 1,3, 1, 4,5, 4, 6, 1,6, 7, 1 and 1
Received: 10 May 2010; in revised form: 21 June 2010 / Accepted: 25 June 2010 / Published: 29 June 2010
(This article belongs to the Special Issue Quantum Information)
Download PDF [1597 KB, uploaded 29 June 2010]
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.
Keywords: quantum dots; quantum wires; noise; single-electron tunneling quantum dots; quantum wires; noise; single-electron tunneling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Küng, B.; Gustavsson, S.; Choi, T.; Shorubalko, I.; Pfäffli, O.; Hassler, F.; Blatter, G.; Reinwald, M.; Wegscheider, W.; Schön, S.; Ihn, T.; Ensslin, K. Measurement Back-Action in Quantum Point-Contact Charge Sensing. Entropy 2010, 12, 1721-1732.

AMA Style

Küng B, Gustavsson S, Choi T, Shorubalko I, Pfäffli O, Hassler F, Blatter G, Reinwald M, Wegscheider W, Schön S, Ihn T, Ensslin K. Measurement Back-Action in Quantum Point-Contact Charge Sensing. Entropy. 2010; 12(7):1721-1732.

Chicago/Turabian Style

Küng, Bruno; Gustavsson, Simon; Choi, Theodore; Shorubalko, Ivan; Pfäffli, Oliver; Hassler, Fabian; Blatter, Gianni; Reinwald, Matthias; Wegscheider, Werner; Schön, Silke; Ihn, Thomas; Ensslin, Klaus. 2010. "Measurement Back-Action in Quantum Point-Contact Charge Sensing." Entropy 12, no. 7: 1721-1732.


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