Reversing quantum trajectories with analog feedback
De Lange G, Riste D, Tiggelman MJ, Tornberg L, Johansson G, Wallraff AJ, Schouten RN, Dicarlo L, Eichler C (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 112
Article Number: 080501
Journal Issue: 8
DOI: 10.1103/PhysRevLett.112.080501
Abstract
We demonstrate the active suppression of transmon qubit dephasing induced by dispersive measurement, using parametric amplification and analog feedback. By real-time processing of the homodyne record, the feedback controller reverts the stochastic quantum phase kick imparted by the measurement on the qubit. The feedback operation matches a model of quantum trajectories with a measurement efficiency ηËœ≈0.5, consistent with the result obtained by postselection. We overcome the bandwidth limitations of the amplification chain by numerically optimizing the signal processing in the feedback loop and provide a theoretical model explaining the optimization result. © 2014 American Physical Society.
Authors with CRIS profile
Involved external institutions
Delft University of Technology (TU Delft)
Netherlands (NL)
Chalmers University of Technology / Chalmers tekniska högskola
Sweden (SE)
Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Switzerland (CH)
Netherlands (NL)
Chalmers University of Technology / Chalmers tekniska högskola
Sweden (SE)
Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Switzerland (CH)
How to cite
APA:
De Lange, G., Riste, D., Tiggelman, M.J., Tornberg, L., Johansson, G., Wallraff, A.J.,... Eichler, C. (2014). Reversing quantum trajectories with analog feedback. Physical Review Letters, 112(8). https://doi.org/10.1103/PhysRevLett.112.080501
MLA:
De Lange, Gijs, et al. "Reversing quantum trajectories with analog feedback." Physical Review Letters 112.8 (2014).
BibTeX: Download