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Q: Fachverband Quantenoptik und Photonik

Q 19: Quantum Information (Quantum Repeater) I

Q 19.5: Talk

Monday, March 11, 2019, 17:15–17:30, S HS 001 Chemie

A multiplexed individual-atom memory for photonic qubits — •Stefan Langenfeld, Matthias Körber, Olivier Morin, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

Quantum memories can preserve qubits for an extended duration. In combination with the capability to map photonic qubits into and out of the memory, this has important applications in quantum computation and communication. After recently demonstrating a qubit memory featuring a coherence time compatible with global scale communication [1], we now implement multi-qubit storage capabilities in the same setup. Our system consists of several ⁸⁷Rb atoms trapped in a two-dimensional optical lattice in a high-finesse optical resonator. We use an imaging system capable of resolving the position of individual atoms [2]. An acousto-optic deflector enables to select any atom and steer an optical beam onto it which we use for an atom-selective single-photon stimulated Raman adiabatic passage (STIRAP). Decoupling of the unaddressed atoms and the cavity by using single-photon detunings of many MHz results in close to negligible cross-talk and near-unity fidelity. These results promote individually addressable neutral atoms in optical cavities to a scalable architecture and make them a prime candidate for realizing quantum repeater architectures.

[1] M. Körber, O. Morin et al., Nat. Photonics 12, 18-21 (2018)

[2] A. Neuzner et al., Nat. Photonics 10, 303-306 (2016)