Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit
Journal article, 2021

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.

Author

Yong Lu

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Ingrid Strandberg

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Isaac Fernando Quijandria Diaz

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Göran Johansson

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Simone Gasparinetti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 126 25 253602

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PhysRevLett.126.253602

PubMed

34241509

More information

Latest update

7/8/2021 8