Project description
FET Open Light-Matter interfaces in absence of cavities

This project 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.


Due to the ongoing miniaturization of devices, one of the central challenges of the 21st century's technology will be to handle quantum effects at the nanoscale. A first fundamental paradigm shift happened in the mid '90s when it was realized that quantum effects, which from the traditional point of view put fundamental limits on the possible miniaturization, could be exploited to do information theoretic tasks impossible with classical devices. The main obstacle in building such quantum devices however is the occurrence of decoherence, by which coherence within the quantum device gets degraded due to the coupling with the environment.
In this proposal, we propose a second paradigm shift by demonstrating that one can actually take advantage of decoherence if engineered in a smart way. The central focus will be the study of quantum processes driven by dissipation, and we will investigate whether quantum coherence and the associated applications can actually be driven by decoherence. The main tools that we plan to use to achieve that goal originate from the theory of quantum entanglement. The timing of this innovative project is actually perfect as the field of entanglement theory is just mature enough to pursue the ambitious goals stated in this proposal.
The main objectives of this proposal are 1. to set up a rigorous mathematical framework for studying fixed points and convergence rates of dissipative processes; 2. to investigate how highly entangled quantum states arising in strongly correlated quantum systems or in a quantum information theoretic context can be created by dissipative processes; 3. to study quantum devices powered by dissipation such as quantum memories and quantum Metropolis devices; 4. to use such devices to come up with novel ways for implementing quantum computation in the presence of decoherence; 5. to study non-equilibrium phase transitions driven by dissipation and associated to that new possible phases of matter.

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