• Open Access

Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit

Yong Lu, Ingrid Strandberg, Fernando Quijandría, Göran Johansson, Simone Gasparinetti, and Per Delsing
Phys. Rev. Lett. 126, 253602 – Published 25 June 2021
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Abstract

We experimentally demonstrate the steady-state generation of propagating Wigner-negative states from a continuously driven superconducting qubit. We reconstruct the Wigner function of the radiation emitted into propagating modes defined by their temporal envelopes, using digital filtering. For an optimized temporal filter, we observe a large Wigner logarithmic negativity, in excess of 0.08, in agreement with theory. The fidelity between the theoretical predictions and the states generated experimentally is up to 99%, reaching state-of-the-art realizations in the microwave frequency domain. Our results provide a new way to generate and control nonclassical states, and may enable promising applications such as quantum networks and quantum computation based on waveguide quantum electrodynamics.

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  • Received 5 February 2021
  • Accepted 1 June 2021
  • Corrected 16 December 2022

DOI:https://doi.org/10.1103/PhysRevLett.126.253602

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by Bibsam.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Corrections

16 December 2022

Correction: The copyright license statement was presented incorrectly and has been fixed.

Authors & Affiliations

Yong Lu*, Ingrid Strandberg, Fernando Quijandría, Göran Johansson, Simone Gasparinetti, and Per Delsing

  • Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

  • *yongl@chalmers.se
  • goran.l.johansson@chalmers.se
  • per.delsing@chalmers.se

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Issue

Vol. 126, Iss. 25 — 25 June 2021

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