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FRI: Friday Contributed Sessions

FRI 5: QIP Implementations: Solid-State Devices II

FRI 5.7: Talk

Friday, September 12, 2025, 12:15–12:30, ZHG006

Influence of dephasing on the indistinguishability of 2D and bulk-embedded semiconductor quantum emitters — •Steffen Wilksen, Alexander Steinhoff, and Christopher Gies — Institute for Physics, Faculty V, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany

The generation of high-quality single photons is an important prerequisite for a multitude of quantum applications, including linear (photonic) quantum computing and quantum communication. While antibunching has been demonstrated in many cases, limitations of the Hong-Ou-Mandel (HOM) indistinguishability, quantifying the ability of emitted photons to interfere with each other, remain an open research question especially in single-photon sources based on 2D van der Waals materials.

In this talk, we analyze the influence of the coupling to acoustic phonon modes on the photon indistinguishability in two types of semiconductor-based single-photon sources, i.e. quantum dots in transition-metal dichalcogenides (TMDs), and III-V quantum-dot molecules. We simulate the HOM experiment and determine the indistinguishability by numerically computing two-time correlation functions. Results are obtained using an exact diagonalization approach, taking into account both markovian and non-markovian contributions. An optical cavity is considered for altering the recombination rate via the Purcell effect. Our results reveal fundamental limitations of HOM indistinguishability in TMD-based single-photon sources, rooted in the two-dimensional nature of the phonons.

Keywords: Single photon sources; Indistinguishability; Dephasing; Quantum emitters; Quantum-dot molecules