The Origin of Antibunching in Resonance Fluorescence

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...

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Bibliographic Details
Published in:arXiv.org 2020-05
Main Authors: Hanschke, Lukas, Schweickert, Lucas, Juan Camilo López Carreño, Schöll, Eva, Zeuner, Katharina D, Lettner, Thomas, Eduardo Zubizarreta Casalengua, Reindl, Marcus, Saimon Filipe Covre da Silva, Trotta, Rinaldo, Finley, Jonathan J, Rastelli, Armando, Elena del Valle, Laussy, Fabrice P, Zwiller, Val, Müller, Kai, Jöns, Klaus D
Format: Article
Language:English
Subjects:
Coherent scattering
Continuous radiation
Correlation analysis
Photon emission
Photons
Quantum dots
Quantum optics
Resonance fluorescence
Squeezed states (quantum theory)
Wave excitation
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2005.11800