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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.37: Poster

Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal

Two-Atom Quantum Gate employing an Optical Resonator — •Stephan Welte, Bastian Hacker, Severin Daiss, Lin Li, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Optical high-finesse resonators provide an interface between flying photonic qubits and stationary matter qubits [1], which is the foundation of an extended quantum network for quantum communication and distributed quantum computing. For the construction of a scalable network architecture, each node is required to hold several qubits that are connected through quantum gate operations. We present our experiment [2] where such a gate [3] is realized on two neutral Rubidium atoms trapped inside of a strongly coupled optical resonator. The gate itself is mediated by one optical photon, travelling in the network channel of our resonator. This creates an interaction that is independent of the distance between the atoms. We demonstrate the functionality of our gate as a CNOT as well as its ability to entangle the two atoms. The presented gate mechanism has the potential to serve as an entanglement swapping protocol in a future quantum repeater based on cavity QED systems.
1  A. Reiserer, G. Rempe, Rev. Mod. Phys. 87, 1379 (2015).
2  S. Welte, B. Hacker, S. Daiss, S. Ritter, G. Rempe, Phys. Rev. Lett. 118, 210503 (2017).
3  L.-M. Duan, B. Wang, H. J. Kimble, Phys. Rev. A 72, 032333 (2005).