| DOI | Resolve DOI: https://doi.org/10.1038/nphys2326 |
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| Author | Search for: Granger, G.1; Search for: Taubert, D.; Search for: Young, C. E.; Search for: Gaudreau, L.2; Search for: Kam, A.2; Search for: Studenikin, S. A.3; Search for: Zawadzki, P.3; Search for: Harbusch, D.; Search for: Schuh, D.; Search for: Wegscheider, W.; Search for: Wasilewski, Z. R.2; Search for: Clerk, A. A.; Search for: Ludwig, S.; Search for: Sachrajda, A. S.3 |
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| Affiliation | - National Research Council of Canada. Measurement Science and Standards
- National Research Council of Canada. Information and Communication Technologies
- National Research Council of Canada. Security and Disruptive Technologies
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| Format | Text, Article |
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| Abstract | Spin qubits have been successfully realized in electrostatically defined, lateral few-electron quantum-dot circuits. Qubit readout typically involves spin to charge information conversion, followed by a charge measurement made using a nearby biased quantum point contact (QPC). It is critical to understand the back-action disturbances resulting from such a measurement approach. Previous studies have indicated that QPC detectors emit phonons which are then absorbed by nearby qubits. We report here the observation of a pronounced back-action effect in multiple dot circuits, where the absorption of detector-generated phonons is strongly modified by a quantum interference effect, and show that the phenomenon is well described by a theory incorporating both the QPC and coherent phonon absorption. Our combined experimental and theoretical results suggest strategies to suppress back-action during the qubit readout procedure. |
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| Publication date | 2012-06-03 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21268925 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 233368d5-0387-4a2a-8587-7223352a8cbf |
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| Record created | 2013-11-26 |
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| Record modified | 2020-04-21 |
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