Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Focus Session: New Bright Sources of Quantum Microwaves

TT 10.9: Talk

Monday, April 1, 2019, 18:30–18:45, H2

Steady-state generation of Wigner-negative states in 1D resonance fluorescence — •Fernando Quijandria, Ingrid Strandberg, and Göran Johansson — Microtechnology and Nanoscience, MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

In this work, we generate nonclassical states of the electromagnetic field by utilizing the strong coupling between an artificial two-level atom and a one-dimensional waveguide. We use the negativity of the Wigner function as an indicator of nonclassicality. States characterized by a negative Wigner function are a necessary element for protocols promising to overcome classical computational power. We study the steady-state emission from a continuously driven atom using the method of quantum trajectories. We simulate the conditioned evolution of an atom being subjected to quadrature meassurement. In turn, from the measurement statistics we are able to reconstruct the state of the emitted field. We show that using this setup it is possible to generate coherent superpositions of Fock states beyond vacuum and single-photons.
F. Quijandría, I. Strandberg and G. Johansson. arXiv:1806.01355 (2018), accepted in Phys. Rev. Lett. (in press).