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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Technologies (Color Centers and Ion Traps) II (joint session Q/QI)

Q 68.1: Invited Talk

Friday, March 14, 2025, 11:00–11:30, HS Botanik

Multi-color excitation of quantum emitters — •Thomas Bracht — TU Dortmund, 44227 Dortmund, Germany

On-demand photon generation is essential for reliable quantum communication. Solid state quantum emitters have emerged as a promising platform, offering excellent photon properties and controllability.

In this talk, I introduce the Swing-UP of quantum EmitteR (SUPER) scheme, which enables excitation of a quantum emitter using two pulses of different colors, allowing for completely off-resonant, red-detuned excitation. This novel multi-color approach is advantageous as spectral filtering can be used to suppress the excitation laser, boosting the total photon yield. In a completely quantized picture, it corresponds to a two-photon process [1]. After its theoretical prediction [2], the SUPER scheme has been experimentally demonstrated in quantum dots [3] and other systems.

As an outlook, I show how this technique can be used to generate highly entangled photon pairs, which are an important building block in quantum information technology.

[1] Richter et al., arXiv:2405.20095 (2024) [2] Bracht et al., PRX Quantum 2, 040354 (2021) [3] Karli et al., Nano Lett. 22, 6567 (2022)

Keywords: solid state quantum emitters; single photons; entangled photons; quantum dot