The Origin of Antibunching in Resonance Fluorescence

• URL: http://arxiv.org/abs/2005.11800v1
• Date: Sun, 24 May 2020 16:48:33 GMT
• Title: The Origin of Antibunching in Resonance Fluorescence
• Authors: Lukas Hanschke, Lucas Schweickert, Juan Camilo L\'opez Carre\~no, Eva Sch\"oll, Katharina D. Zeuner, Thomas Lettner, Eduardo Zubizarreta Casalengua, Marcus Reindl, Saimon Filipe Covre da Silva, Rinaldo Trotta, Jonathan J. Finley, Armando Rastelli, Elena del Valle, Fabrice P. Laussy, Val Zwiller, Kai M\"uller, and Klaus D. J\"ons
• Abstract summary: Epitaxial quantum dots have emerged as one of the best single-photon sources. One intriguing observation is the scattering of photons with subnatural linewidth from a two-level system. Here, we demonstrate that this simultaneous observation of subnatural linewidth and antibunching is not possible with simple resonant excitation.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Epitaxial quantum dots have emerged as one of the best single-photon sources, not only for applications in photonic quantum technologies but also for testing fundamental properties of quantum optics. One intriguing observation in this area is the scattering of photons with subnatural linewidth from a two-level system under resonant continuous wave excitation. In particular, an open question is whether these subnatural linewidth photons exhibit simultaneously antibunching as an evidence of single-photon emission. Here, we demonstrate that this simultaneous observation of subnatural linewidth and antibunching is not possible with simple resonant excitation. First, we independently confirm single-photon character and subnatural linewidth by demonstrating antibunching in a Hanbury Brown and Twiss type setup and using high-resolution spectroscopy, respectively. However, when filtering the coherently scattered photons with filter bandwidths on the order of the homogeneous linewidth of the excited state of the two-level system, the antibunching dip vanishes in the correlation measurement. Our experimental work is consistent with recent theoretical findings, that explain antibunching from photon-interferences between the coherent scattering and a weak incoherent signal in a skewed squeezed state.

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