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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.48: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Carving of atomic Bell states with a cavity — •Bastian Hacker, Stephan Welte, Severin Daiss, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Entangled pairs of atoms are ideal for the study of fundamental quantum correlations and as a resource for many tasks in quantum information processing. At the node of an optical quantum network they can be applied for local information processing tasks, and, when strongly coupled to flying qubits, as a resource for more complex network operations. Our experiment applies the technique of quantum state carving to create entangled states of two rubidium atoms trapped in one optical cavity. The cavity strongly couples both atoms to the field of a reflected light pulse and thereby allows us to perform projective measurements on the combined two-atom state that can lead to maximally entangled states in a heralded fashion. Using coherent qubit control and several protocols we demonstrate the creation of all four Bell states. Dependence on experimental parameters will be discussed. Our entangled atoms in a cavity are an ideal starting point for applications like entanglement distribution, distributed quantum computing or a quantum repeater.