Browsing by Author "Navarro Asan-Srain, Mariana"
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Item Interferencia de Dos Fotones con un Divisor de Haz 4 × 4 de Fibra Óptica Multinúcleo.(Universidad de Concepción, 2023) Navarro Asan-Srain, Mariana; Walborn, Stephen PatrickThe motivation of this thesis is driven by the recent development of high-quality four-core optical fiber beamsplitters, which achieve a near-perfect 25% split ratio between the four cores placed within the same cladding material. An important application of these optical beamsplitters in the context of quantum information is the realization of two-photon interference, as it is a fundamental phenomenon for information processing of photonic quantum technologies. Moreover, it forms the basis for performing measurements of maximally entangled states and can be used to produce quantum correlations. As a first investigation, using weak coherent input states to study fourth-order interference in a four-core optical fiber beam splitter, we show experimentally that quantum correlations, in the form of geometric discord, can be controlled and maximized by manipulating the intensity of the input states. As a second investigation, we design and theoretically studied a photonic Bell state analyzer for four-dimensional states. With two-photon interference in a pair of four-core beam splitters, we achieve optimal discrimination of the 4×4 Bell states, resulting in seven outcomes. Then, we show that with a pair of entangled ancilla photons, we can probabilistically (yet unequivocally) identify a single Bell state. This thesis should contribute to the exploitation of quantum correlations and the implementation of Bell measurements in quantum communication protocols in future telecommunication networks, in particular, those that take advantage of spatially structured fibers.