Measurement Back-Action in Quantum Point-Contact Charge Sensing
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 presen...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2010-06-01
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| Series: | Entropy |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1099-4300/12/7/1721/ |
| _version_ | 1798024381847306240 |
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| author | Bruno Küng Simon Gustavsson Theodore Choi Ivan Shorubalko Oliver Pfäffli Fabian Hassler Gianni Blatter Matthias Reinwald Werner Wegscheider Silke Schön Thomas Ihn Klaus Ensslin |
| author_facet | Bruno Küng Simon Gustavsson Theodore Choi Ivan Shorubalko Oliver Pfäffli Fabian Hassler Gianni Blatter Matthias Reinwald Werner Wegscheider Silke Schön Thomas Ihn Klaus Ensslin |
| author_sort | Bruno Küng |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T18:02:40Z |
| format | Article |
| id | doaj.art-05e2ed559a5843cb90a80d16ee89c7a0 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T18:02:40Z |
| publishDate | 2010-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-05e2ed559a5843cb90a80d16ee89c7a02022-12-22T04:10:26ZengMDPI AGEntropy1099-43002010-06-011271721173210.3390/e12071721Measurement Back-Action in Quantum Point-Contact Charge SensingBruno KüngSimon GustavssonTheodore ChoiIvan ShorubalkoOliver PfäffliFabian HasslerGianni BlatterMatthias ReinwaldWerner WegscheiderSilke SchönThomas IhnKlaus EnsslinCharge 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.http://www.mdpi.com/1099-4300/12/7/1721/quantum dotsquantum wiresnoisesingle-electron tunneling |
| spellingShingle | Bruno Küng Simon Gustavsson Theodore Choi Ivan Shorubalko Oliver Pfäffli Fabian Hassler Gianni Blatter Matthias Reinwald Werner Wegscheider Silke Schön Thomas Ihn Klaus Ensslin Measurement Back-Action in Quantum Point-Contact Charge Sensing Entropy quantum dots quantum wires noise single-electron tunneling |
| title | Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| title_full | Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| title_fullStr | Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| title_full_unstemmed | Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| title_short | Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| title_sort | measurement back action in quantum point contact charge sensing |
| topic | quantum dots quantum wires noise single-electron tunneling |
| url | http://www.mdpi.com/1099-4300/12/7/1721/ |
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