Reversing quantum trajectories with analog feedback

G. De Lange; D. Ristè; M. J. Tiggelman; C. Eichler; L. Tornberg; G. Johansson; A. Wallraff; R. N. Schouten; L. Dicarlo

doi:10.1103/PhysRevLett.112.080501

Reversing quantum trajectories with analog feedback

G. De Lange, D. Ristè, M. J. Tiggelman, C. Eichler, L. Tornberg, G. Johansson, A. Wallraff, R. N. Schouten, L. Dicarlo

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	080501
Journal	Physical Review Letters
Volume	112
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.112.080501
State	Published - 24 Feb 2014
Externally published	Yes

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10.1103/PhysRevLett.112.080501

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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 η{\"E}{\oe}≈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.",

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AU - Johansson, G.

AU - Wallraff, A.

AU - Schouten, R. N.

AU - Dicarlo, L.

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Reversing quantum trajectories with analog feedback

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