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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.15: Poster

Dienstag, 12. März 2024, 17:00–19:00, Tent B

A graph-based approach to dissipative production of multipartite entangled states in trapped ions — •Antoine Guinchard, Karl Horn, Daniel Reich, and Christiane Koch — Freie Universität Berlin, Berlin, Deutschland

Entanglement is a key ingredient for quantum technologies. We study the creation of entangled states on trapped ion qubits, where logical states are encoded in the ionic hyperfine states which are coupled via common vibrational modes. By leveraging dissipative processes in this system, schemes to generate both two- and three-partite entanglement have recently been developed by Karl P Horn et al [2018 New J. Phys. 20 123010] and Daniel C Cole et al [2021 New J. Phys. 23 0730].

We developed a graph-theoretical approach which allows us to find dissipative protocols to generate entangled states in a computationally efficient way by representing the population flow on the logical state space. This method allows us to both reproduce the previously derived protocols for the three-qubit case and even find entirely new schemes. By adding an extra transition per qubit, we are able to show that one of our new schemes is scalable to an arbitrary number of qubits. Due to the graph-based and system-agnostic nature of our method, our protocols can be generalised to a wide variety of experimental setups.

Keywords: dissipative generation; multipartite entanglement; trapped ion qubit; reservoir engineering; graph-based