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MALICIA - Light-matter Interfaces in Absence of Cavities
Properties of interfaces between light and nonclassical collective quantum states of atoms teach us how to build large quantum networks.
MALICIA aims at the creation of robust and scalable quantum interfaces between different platforms for the implementation of Quantum Technologies. We will focus on interfacing interaction or measurement induced quantum resources in atomic matter to light fields, based on less demanding alternatives to cavity-enhanced interaction of light with single ultracold atoms. For some applications we even plan to use thermal atoms which allow for a further reduction in the experimental complexity. To this end we want to push the evolution of Quantum Technologies further towards technologically scalable quantum devices. We will realize quantum devices and interfaces based on Rydberg blockaded gases, quantum gases and room temperature gases in microfabricated structures as well as the full theoretical framework for their description. The new expertise emerging from our project will provide a platform for progress in Information and Communication Technology (ICT) towards real-world deployment of quantum repeaters for long-distance quantum communication.
In classical communication information is transferred encoded in pulses of light that photodetectors transforme into electrical current pulses, amplified by electronics, and send to computers, phones, etc. This transformation of light into electrical signals forms a classical light-matter interface, but in quantum information processing this simple approach is inadequate as it destroys the quantum aspect. Quantum communication requires a coherent storage interface-quantum repeaters.
Project MALICIA tackles all the different aspects needed for a repeater in a combined and integrated effort. I.e. extending memory capabilities to single photon/qubit storage in diverse media, exploring hybrid approaches, developing probabilistic repeater schemes integrated using atoms on chip technology, integrated solutions or circuits that connect multiple elements such as source, detector and interface, and incorporating deterministic strategies for sources, storage and entanglement swapping.
An interface between quantum information carriers (quantum states of light) and quantum information storage and processors (atoms in our case) is an integral part of a full-scale quantum information system. Recent efforts have seen diverse systems making key proof-of-principle demonstrations of long storage times, high efficiency, and high fidelities. In the context of quantum communication, the goal for all of these approaches is integration with photonic (flying qubit) systems and their operation in complete quantum repeater architectures and protocols. Putting the accent on miniaturization and compatibility our project aims at a first realistic protocol for a quantum repeater which would allow a direct technological implementation with a tremendous impact on Quantum Communication Technologies.
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Elenco Siti Tematici