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Title: Polarisation-entangled photon pairs from the quantum dot biexciton cascade
Author: Hudson, A. J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2008
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Entanglement is one of the strangest phenomena to arise from the theory of quantum mechanics. The counter-intuitive connection between the wavefunctions of two completely separate bodies is the basis for some of the most exciting applications of quantum theory that have been proposed so far, including teleportation, quantum computation and long-range unconditionally secure communication. An inexpensive solid-state device capable of producing controlled entanglement on demand would be a huge step towards the practical realisation of many of these schemes. In 2006 the world’s first triggered semiconductor source of polarisation-entanglement photon pairs was produced in a collaboration between Toshiba Research Europe Ltd and the University of Cambridge. The work described in this thesis begins immediately after that demonstration. The source is used for a proof-of-principle experiment to demonstrate its viability for quantum-enhanced imaging resolution. Ways of improving the source are examined through careful manipulation of the growth of the quantum dots, and various types of optical cavity designed to couple the emission out of the device. The quantum mechanics of the biexciton cascade are studied closely, using both original theory and experimental results, testing the robustness against dephasing effects and the stringency of the requirement for degenerate exciton states. Finally a new method is developed for significantly enhancing the fidelity of the source using a temporal filter on the emission.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available