Measurement Back-Action in Quantum Point-Contact Charge Sensing

被引：6

作者：

Kueng, Bruno ^{[1
]}

Gustavsson, Simon ^{[1
,2
]}

Choi, Theodore ^{[1
]}

Shorubalko, Ivan ^{[1
,3
]}

Pfaeffli, Oliver ^{[1
]}

Hassler, Fabian ^{[4
]}

Blatter, Gianni

Reinwald, Matthias ^{[5
]}

Wegscheider, Werner ^{[1
,5
]}

Schoen, Silke ^{[6
]}

Ihn, Thomas ^{[1
]}

Ensslin, Klaus ^{[1
]}

机构：

[1] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[2] MIT, Cambridge, MA 02139 USA

[3] EMPA, CH-8600 Dubendorf, Switzerland

[4] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[5] Univ Regensburg, Inst Expt & Angew Phys, D-93040 Regensburg, Germany

[6] ETH, FIRST Lab, CH-8093 Zurich, Switzerland

来源：

ENTROPY | 2010年 / 12卷 / 07期

基金：

瑞士国家科学基金会;

关键词：

quantum dots; quantum wires; noise; single-electron tunneling; COULOMB-BLOCKADE; ELECTRON-SPIN; READ-OUT; NOISE;

D O I：

10.3390/e12071721

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：1721 / 1732

页数：12

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