Speaker: 
Stefanie Barz - University of Stuttgart

Title: 
Quantum photonics: interference beyond HOM, entanglement, and quantum networks 

Abstract:
I will start by introducing the key principles of photonic quantum technologies, and then show a series of recent results on different aspects of those. Starting with quantum optics and quantum foundations, I will then introduce experiments on quantum networks both on the hardware and software side.
In particular, I will first be talking about quantum interference - a central ingredient of photonic quantum technologies. I will discuss novel aspects quantum interference and demonstrate how two fundamental properties of quantum states, distinguishability and mixedness, impact the interference of multiple single photons. I will then show how we can exploit interference of single photons to generate multipartite entangled quantum states and present a novel method that allows switching between different types of states by just local single-photon operations. 
Second, I will show how photon interference and entangled states can be used in quantum networks. I will talk about a crucial component of a photonic quantum network: Bell-state measurements and report on an experimental demonstration of a scheme that allows obtaining a success probability of more than 50%. Finally, I will show multipartite entanglement can lead to an advantage in networked quantum communication.

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QuCoLiMa Talks are the weekly seminar of the collaborative research center TRR 306 QuCoLiMa (Quantum Cooperativity of Light and Matter). The talks are given by (external) experts, whose research falls within the scope of QuCoLiMa.

More information at www.qucolima.de/talks