Quantum measurement induces a many-body transition

Ferguson, Michael S. and Camenzind, Leon C. and Müller, Clemens and Biesinger, Daniel E. F. and Scheller, Christian P. and Braunecker, Bernd and Zumbühl, Dominik M. and Zilberberg, Oded. (2020) Quantum measurement induces a many-body transition. arXiv, 2010. 04635.

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Official URL: https://edoc.unibas.ch/81977/

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The current revolution in quantum technologies relies on the ability to isolate, coherently control, and measure the state of quantum systems. The act of measurement in quantum mechanics, however, is naturally invasive as the measurement apparatus becomes entangled with the system that it observes. Even for ideal detectors, the measurement outcome always leads to a disturbance in the observed system, a phenomenon called quantum measurement backaction. Here we report a profound change in the many-body properties of the measured system due to quantum measurements. We observe this backaction-induced transition in a mesoscopic double quantum-dot in the Coulomb-blockade regime, where we switch the electron population through measurement with a charge sensor dot. Our finding showcases the important changes in behaviour that can arise due to quantum detectors, which are ubiquitous in quantum technologies.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:11 May 2021 09:00
Deposited On:11 May 2021 09:00

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