Year: 2020
Type: dissertation
Abstract: In days where Science Fiction uses the word ?Quantum? to justify any weird phenomena, we are actually on the edge of the Second Quantum Revolution. The ability to harness the potential of the quantum state of single particles leads research to make steps towards, amongst others, the creation of the Quantum Internet. To complete this project are needed end nodes, repeaters, and channels that can reliably transport a flying qubit without affecting its state. In this work we present a system designed to automatically compensate drifts occurring in one of the most popular channels: optical fibres carrying polarisation-encoded photons. Based on a feedback loop and a set of piezoelectric actuators influencing the birefringence of the propagation material, the system can iteratively reduce the drifts in the fibre. From the measurement of the state of polarisation of light at the output for a known input, the correction to apply is calculated and average fidelities of 99.98 % are reached. Such system could simplify future experiments that connect multiple nodes by eliminating the need of manual control over the variations in polarisation in the fibre.
Author: Simon Cichy Cusi
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3153214863