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Abstract
Quantum technologies promise to revolutionize a variety of fields such as metrology, cryptography or computing, among others. The resources that quantum mechanics offers allow us to design faster optimization algorithms, to improve security in communications, and to measure quantities beyond the grasp of current technology. However, these exciting applications are in most cases proof of principles, and they have been tested only under the optimal conditions of a laboratory.
In this work we have addressed, experimentally and theoretically, three issues that are relevant for the development of quantum technologies. The first one is the search for more efficient quantum-dot-based devices, capable of delivering photon pairs on-demand and efficiently generate entanglement. We approached this issue by studying InAs/GaAs quantum dots embedded in self-aligned cavities and broadband micropillars. We measured entanglement in the time-bin degree of freedom as well as the indistinguishability and coherent control of the emitter. The second issue is the high performance that experimental setups are required to display in order to successfully complete quantum information protocols. In particular, we focused in device-independent quantum key distribution DI-QKD. We tackled this problem by proposing new DI-QKD protocols that benefit from the use of more inputs and outputs. Finally, the third problem studied is the implementation of
simultaneous nonlocality-contextuality SNC tests. We addressed this by deriving new Bell inequalities that facilitate the experimental realization of a SNC test.