Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 22: Focus Session: Young Semiconductor Forum

HL 22.20: Poster

Tuesday, March 19, 2024, 11:00–15:30, Poster F

Ultrafast coherent control of single-photon emitters in hBN — Johann A. Preuß¹, Daniel Groll¹, Robert Schmidt¹, Thilo Hahn¹, Pawel Machnikowski², Tilmann Kuhn¹, Daniel Wigger³, and •Steffen Michaelis de Vasconcellos¹ — ¹Universität Münster, Germany — ²Wrocław University of Science and Technology, Poland — ³Trinity College Dublin, Ireland

Single-photon sources are essential building blocks for quantum networks, and their coherent control remains a key challenge. Recently, single-photon sources in 2D van der Waals materials joined the family of solid-state quantum light emitters. In hexagonal boron nitride (hBN), optically active states have been discovered that efficiently emit single photons even at room temperature. This emitter's variable emission wavelength, narrow lines, and tunability make it promising for quantum sensing and wavelength division multiplexed quantum communications. Our study demonstrates femtosecond coherent state manipulation of individual hBN quantum emitters, showcasing resonant and phonon-assisted control mechanisms. The joint experiment-theory study explores the effects of different sources of spectral jitter on the ultrafast coherence dynamics and how the dephasing of optical and acoustic phonons affects the coherence. Our experiments on phonon-assisted ultrafast coherent control of individual hBN color centers are an important step towards hybrid quantum technologies that combine electronic and phononic excitations.

Keywords: coherent control; single-photon emitter; 2D materials; hBN