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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics with Photons II

Q 61.6: Talk

Friday, March 10, 2023, 12:30–12:45, E001

Interference and Entanglement Generation using Multiport Beam Splitters — •Shreya Kumar¹, Daniel Bhatti¹, Alex E Jones², and Stefanie Barz¹ — ¹Institute for Functional Matter and Quantum Technologies and IQST, University of Stuttgart, 70569 Stuttgart, Germany — ²Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1FD, UK

Multi-photon entanglement is an integral part of optical quantum technologies. The generation of multi-photon entangled states typically employs the fusion of entangled pairs of photons from several sources. However, each type of state requires a different configuration of the experimental setup and thus, switching between different states can be cumbersome. Here, we demonstrate a simple and versatile scheme to generate different types of genuine tripartite entangled states with one experimental setup. We send three independent photons through a triport beam splitter, known as a tritter, to generate tripartite W, G and GHZ states. Varying the internal input states, for example, polarization, of the photons and post-selecting output combinations with a certain photon number distribution results in the generation of entangled states. We obtain fidelities of 87.33%, 83.42% and 78.84% for the W, G and GHZ states, respectively, confirming successful generation of genuine tripartite entanglement. Our scheme may also be used as a quantum network server, providing resource states to multiple parties to execute quantum protocols.