Angeletti, Jacopo (2024) Advancements in quantum information: dissipative stabilisation and microwave quantum illumination. [Tesi di dottorato]

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Positioned at the forefront of scientific progress, the quantum realm promises transformative advancements, reshaping our responses to intricate challenges. In the dynamic landscape of quantum technologies, this doctoral thesis endeavors to unravel two distinct facets. The first part delves into the complexities of steering a quantum array into a pure steady state, where distant, non-directly interacting qubits become entangled. By artfully manipulating dissipative dynamics on a central element, we not only showcase the attainability of an entangled steady state, but also underscore its resilience to additional decoherence. With broad applications across atomic systems and solid-state nano-devices, this approach allows for the realization of diverse geometries. Shifting focus to the second part, our attention turns to the quantum illumination, addressing imperfections inherent in experimental setups. Here, correlation-to-displacement conversion-based receivers take the spotlight, revealing their efficacy in amplifying return signals to counter losses in heterodyne detection. Notably, a simple Kennedy receiver outperforms classical counterparts in practical settings, presenting a quantum advantage over known quantum receivers. The synthesis of theoretical exploration and practical enhancements contributes meaningfully to the evolving narrative of quantum technologies, marking a distinctive stride towards realizing their potential.

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