Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.23: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Entanglement and coherence in the resonance fluorescence of a two-level quantum emitter — •Gabriele Maron, Xinxin Hu, Luke Masters, Arno Rauschenbeutel, and Jürgen Volz — Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin

The resonance fluorescence of a single two-level emitter is a fundamental phenomenon in quantum optics and is a key resource for photonic quantum technologies. It is well-known that the scattered field consists of a stream of photons that shows antibunched statistics. However, as we recently experimentally showed [1], this behaviour can be viewed as a quantum interference effect between two distinct two-photon components of the scattered light, commonly referred to as coherent and incoherent, which interfere perfectly destructively. Furthermore, it turns out that the incoherently scattered component consists of energy-time entangled photon pairs. Here, the properties of these two-photon components are the subject of further investigation. In particular, we study their interference behaviour in order to analyse the coherence and indistinguishability of photons emitted at different times. Our results demonstrate a high degree of coherence between the emitted photon pairs, which opens up new pathways for the realization of sources of entangled photon pairs based on resonance fluorescence from a single two-level emitter.

[1] Masters et al, Nat. Photon. 17, 972-976 (2023)

Keywords: Entanglement; Coherence; Quantum interference; Indistinguishability