Towards efficient photoluminescence excitation of the silicon T center
B. Zijlstra (TU Delft - Applied Sciences)
C.F. Primavera – Mentor (TU Delft - QID/Hanson Lab)
C. Errando Herranz – Mentor (TU Delft - QID/Herranz Lab)
R. Hanson – Graduation committee member (TU Delft - QID/Hanson Lab)
S. Groeblacher – Graduation committee member (TU Delft - Applied Sciences)
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Abstract
A quantum internet would enable capabilities that are provably impossible using only classical information.
In a future quantum internet, there is a need for an interface between spin-encoded qubits in network nodes and the photonic communication between them. The silicon T center is a promising candidate for use in such a spin-photon interface as it emits in the telecom O-band, has relatively long spin coherence in bulk Silicon-28 samples, and is compatible with the silicon-on-insulator (SOI) platform for easy manufacturing and scalability.
However, its relatively weak and slow emission makes characterization measurements time-consuming.
This thesis investigates how the T center count rate can be increased in confocal resonant excitation measurements. Two photonic structures are characterized: micropucks and bullseye cavities. Bullseyes are found to enhance zero-phonon line emission and are better suited for time-resolved measurements. Count rate estimates show that combining bullseye cavities with time-resolved interval photoluminescence excitation (TRIPLE) measurements can increase the signal-to-noise ratio by a factor of 2.4 compared to the conventional approach.
The TRIPLE setup is built, and a fluorescence lifetime of 620ns is measured in a bullseye structure using off-resonant excitation. Single T center resonant excitation has not yet been achieved, but the setup provides a strong foundation for future measurements.
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