Pulsed resonance fluorescence and two-photon interference using remote quantum dots

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Photonic quantum technology is vital for applications in quantum computing, simulation, sensing, and communication, with photons serving as flying qubits. A fundamental aspect is the two-photon interference of remote sources, which relies on the triggered emission of single, indistinguishable photons. Semiconductor quantum dots are promising candidates for scaling these technologies on a chip-scale footprint. This thesis employs pulsed resonant excitation to minimize decoherence effects in solid-state environments, thereby optimizing two-photon interference among remote quantum dots. It also addresses the wavelength gap essential for long-distance quantum networking, specifically operating in the telecom C-band around 1550 nm to align with the low-loss wavelength of optical fibers. This significant milestone was achieved through quantum frequency conversion, enabling the spectral transfer of pulsed resonance fluorescence from two distinct quantum dots and realizing remote two-photon interference in the telecom C-band. Furthermore, insights from these experiments led to the exploration of a novel unipolar quantum dot diode structure. The suppression of blinking and reduced spectral linewidth facilitated a concept for active frequency stabilization of pulsed resonance fluorescence using lock-in amplification, necessitating critical advancements over previous continuous-wave studies. Overall, this research marks significant progr