Two-photon resonance fluorescence of a ladder-type atomic system

Simone Gasparinetti, Jean-Claude Besse, Marek Pechal, Robin D. Buijs, Christopher Eichler, Howard J. Carmichael, and Andreas Wallraff
Phys. Rev. A 100, 033802 – Published 3 September 2019

Abstract

Multiphoton emitters are a sought-after resource in quantum photonics. Nonlinear interactions between a multilevel atomic system and a coherent drive can lead to resonant two-photon emission, but harvesting light from this process has remained a challenge due to the small oscillator strengths involved. Here we present a study of two-photon resonance fluorescence at microwave frequencies, using a superconducting, ladder-type artificial atom, a transmon, strongly coupled to a waveguide. We drive the two-photon transition between the ground and second-excited states at increasingly high powers and observe a resonance fluorescence peak whose intensity becomes comparable to single-photon emission until it splits into a Mollow-like triplet. We measure photon correlations of frequency-filtered spectral lines and find that while emission at the fundamental frequency stays antibunched, the resonance fluorescence peak at the two-photon transition is superbunched. Our results provide a route towards the realization of multiphoton sources in the microwave domain.

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  • Received 2 January 2019
  • Revised 8 July 2019

DOI:https://doi.org/10.1103/PhysRevA.100.033802

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Simone Gasparinetti1,*, Jean-Claude Besse1, Marek Pechal1, Robin D. Buijs1, Christopher Eichler1, Howard J. Carmichael2, and Andreas Wallraff1

  • 1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland
  • 2The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand

  • *Present address: Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, Kemivägen 9, SE-41296 Göteborg, Sweden; simoneg@chalmers.se

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Vol. 100, Iss. 3 — September 2019

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