Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 25: Materials and Devices for Quantum Technology II (joint session HL/QI)

QI 25.1: Invited Talk

Thursday, March 21, 2024, 14:00–14:30, EW 203

Compact, plug-and-play module to generate high-quality photon states from quantum dots — •Vikas Remesh — Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria

As the quantum revolution gathers pace, there is a constant need to develop novel architectures to control quantum systems. Semiconductor quantum dots (QD) are regarded as the most promising sources of quantum light, due to their wavelength-tunability, high purity, high degrees of entanglement, and scalability. To realize a resource-efficient and scalable platform, it is desirable to have an ensemble of quantum dots that can be collectively excited with high efficiency. Shaped laser pulses have been remarkably effective in the development of controllable quantum systems. The most efficient optical excitation method of quantum dots relies on chirped laser pulses, as it offers robustness against spectral and intensity fluctuations. Yet, the existing methods to generate chirped laser pulses coupled to a quantum emitter are lossy and mechanically unstable, severely hampering the prospects of a practical quantum dot device. In this talk, I will briefly navigate through the impact of pulse-shaping schemes in advancing quantum dot control. Subsequently, I will present a compact, robust, and plug-and-play architecture for chirped pulse excitation of quantum dots, and demonstrate high-quality photon generation. Our method is a significant milestone in realizing a direct fiber-coupled, multipurpose quantum dot photon source.

Keywords: quantum dots; chirped pulses; single photons; entangled photons