Granger, G. and Taubert, D. and Young, C. E. and Gaudreau, L. and Kam, A. and Studenikin, S. A. and Zawadzki, P. and Harbusch, D. and Schuh, D. and Wegscheider, W. and Wasilewski, Z. R. and Clerk, A. A. and Ludwig, S. and Sachrajda, A. S. (2012) Quantum interference and phonon-mediated back-action in lateral quantum-dot circuits. NATURE PHYSICS, 8 (7). pp. 522-527. ISSN 1745-2473,
Full text not available from this repository. (Request a copy)Abstract
Spin qubits have been successfully realized in electrostatically defined, lateral few-electron quantum-dot circuits(1-4). Qubit readout typically involves spin to charge information conversion, followed by a charge measurement made using a nearby biased quantum point contact(1,5,6) (QPC). It is critical to understand the back-action disturbances resulting from such a measurement approach(7,8). Previous studies have indicated that QPC detectors emit phonons which are then absorbed by nearby qubits(9-13). 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSPORT; EMISSION; COHERENT; SYSTEMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 May 2020 05:01 |
| Last Modified: | 12 May 2020 05:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18518 |
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