Advanced Entanglement from Quantum Dots

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Communication is about to be revolutionized by the usage of quantum mechanics, known as the second quantum revolution. At the heart of this revolution are the exploitation of entangled states, which do not have any classical analogue. Therefore, the efficient creation of entangled states is crucial in this endeavor and the race of the search for the ideal source of entangled photon pairs is at its peak. The main goal of our project is to bring forward semiconductor quantum dots as usable source of entangled photon pairs. A new angle is added by a fundamentally new ingredient, namely the dark exciton states, for the controlled biexciton generation and subsequently the deterministic generation of time-bin entangled photons. We will consider advanced creation of time-bin entangled photon states, as well as multilevel entanglement and multiphoton entanglement using single quantum dots and quantum dot molecules. We aim to achieve these goals by a strong joint theoretical and experimental effort to turn the potential of quantum dots as entangled photon source into a useful set of tools for quantum communication, eventually leading to the construction of usable quantum repeaters.