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

Gasparinetti S, Besse JC, Pechal M, Buijs RD, Eichler C, Carmichael HJ, Wallraff A (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Physical Review A American Physical Society

Book Volume: 100

Article Number: 033802

Journal Issue: 3

DOI: 10.1103/PhysRevA.100.033802

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.

Authors with CRIS profile

Christopher Eichler

Involved external institutions

Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich CH Switzerland (CH) University of Auckland NZ New Zealand (NZ)

How to cite

APA:

Gasparinetti, S., Besse, J.-C., Pechal, M., Buijs, R.D., Eichler, C., Carmichael, H.J., & Wallraff, A. (2019). Two-photon resonance fluorescence of a ladder-type atomic system. Physical Review A, 100(3). https://doi.org/10.1103/PhysRevA.100.033802

MLA:

Gasparinetti, Simone, et al. "Two-photon resonance fluorescence of a ladder-type atomic system." Physical Review A 100.3 (2019).

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