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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| 格式: | 文件 |
| 语言: | en_US |
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MDPI Publishing
2011
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| 在线阅读: | http://hdl.handle.net/1721.1/66493 https://orcid.org/0000-0002-7069-1025 |
| _version_ | 1826204489631137792 |
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| author | Küng, Bruno Gustavsson, Simon Choi, Theodore Shorubalko, Ivan Pfäffli, Oliver Hassler, Fabian Blatter, Gianni Reinwald, Matthias Wegscheider, Werner Schön, Silke Ihn, Thomas Ensslin, Klaus |
| author2 | Massachusetts Institute of Technology. Research Laboratory of Electronics |
| author_facet | Massachusetts Institute of Technology. Research Laboratory of Electronics Küng, Bruno Gustavsson, Simon Choi, Theodore Shorubalko, Ivan Pfäffli, Oliver Hassler, Fabian Blatter, Gianni Reinwald, Matthias Wegscheider, Werner Schön, Silke Ihn, Thomas Ensslin, Klaus |
| author_sort | Küng, Bruno |
| collection | MIT |
| 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 | 2024-09-23T12:56:25Z |
| format | Article |
| id | mit-1721.1/66493 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:56:25Z |
| publishDate | 2011 |
| publisher | MDPI Publishing |
| record_format | dspace |
| spelling | mit-1721.1/664932022-10-01T11:59:20Z Measurement Back-Action in Quantum Point-Contact Charge Sensing Küng, Bruno Gustavsson, Simon Choi, Theodore Shorubalko, Ivan Pfäffli, Oliver Hassler, Fabian Blatter, Gianni Reinwald, Matthias Wegscheider, Werner Schön, Silke Ihn, Thomas Ensslin, Klaus Massachusetts Institute of Technology. Research Laboratory of Electronics Gustavsson, Simon Gustavsson, Simon 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. Swiss National Science Foundation 2011-10-19T17:23:40Z 2011-10-19T17:23:40Z 2010-06 2010-06 Article http://purl.org/eprint/type/JournalArticle 1099-4300 http://hdl.handle.net/1721.1/66493 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 https://orcid.org/0000-0002-7069-1025 en_US http://dx.doi.org/10.3390/e12071721 Entropy Creative Commons Attribution 3.0 http://creativecommons.org/licenses/by/3.0 application/pdf MDPI Publishing MDPI |
| spellingShingle | Küng, Bruno Gustavsson, Simon Choi, Theodore Shorubalko, Ivan Pfäffli, Oliver Hassler, Fabian Blatter, Gianni Reinwald, Matthias Wegscheider, Werner Schön, Silke Ihn, Thomas Ensslin, Klaus Measurement Back-Action in Quantum Point-Contact Charge Sensing |
| 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 |
| url | http://hdl.handle.net/1721.1/66493 https://orcid.org/0000-0002-7069-1025 |
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