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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.35: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal

Carving of Two-Atom Entangled States using a Cavity — •Bastian Hacker, Stephan Welte, Severin Daiss, Lin Li, Stephan Ritter, and Gerhard Rempe — Max Planck Institute of Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching

In a quantum network, optical resonators provide an ideal platform to mediate interactions between matter qubits. This is achieved by the exchange of photons between the resonator-based network nodes, and in this way enables the distribution of quantum states and the generation of remote entanglement. Here we demonstrate how photons can also be used to generate local entanglement between matter qubits in the same network node. Such entangled states are a valuable resource in many quantum communication protocols. We employ neutral atoms, that are strongly coupled to a high-finesse optical cavity. Two protocols are implemented, which rely on the reflection of coherent light from the atom-cavity system. Detection of a polarisation flip heralds the entanglement and postselection allows us to remove parts of the combined two-atom wave function, a method called carving. We created all four Bell-states and achieve fidelities with the ideal Bell states of up to 90%. Our entangling mechanism does not depend on the interatomic distance and can be applied to any matter qubit with a closed optical transition. Furthermore, no individual addressing of the atoms is required. One of the potential applications of the presented entangling scheme is the entanglement swapping procedure in a quantum repeater based on neutral atoms in optical resonators.