Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector
Abstract
We investigate experimentally the quantum coherence of an electronic two-level system in a double quantum dot under continuous charge detection. The charge-state of the two-level system is monitored by a capacitively coupled single quantum dot detector that imposes a back-action effect to the system. The measured back-action is well described by an additional decoherence rate, approximately linearly proportional to the detector electron tunneling rate. We provide a model for the decoherence rate arising due to level detuning fluctuations induced by detector charge fluctuations. The theory predicts a factor of two lower decoherence rate than observed in the experiment, suggesting the need for a more elaborate theory accounting for additional sources of decoherence.
Keywords
Cite
@article{arxiv.2406.11383,
title = {Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector},
author = {Subhomoy Haldar and Morten Munk and Harald Havir and Waqar Khan and Sebastian Lehmann and Claes Thelander and Kimberly A. Dick and Peter Samuelsson and Patrick P. Potts and Ville F. Maisi},
journal= {arXiv preprint arXiv:2406.11383},
year = {2025}
}
Comments
5 pages, 3 figures