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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum Information (Quantum Communication and Quantum Repeater) I

Q 41.1: Gruppenbericht

Donnerstag, 12. März 2020, 11:00–11:30, e001

Photonic qubit memories for quantum networks — •Olivier Morin, Stefan Langenfeld, Matthias Körber, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching

The storage of qubits is an extremely important capability for the implementation of numerous protocols in quantum information technology. In the context of quantum networks the qubits are transported from one node to another via the exchange of photonic states. Here, we will report on our progress on photonic memories using single 87Rb atoms in a high finesse cavity.

First, one important figure of merit is the storage time. By using different atomic states we have extended the coherence time beyond 100ms [1]. The second important figure of merit is the efficiency of the memory. This latter does not only rely on minimizing optical losses but also on the accurate control of the temporal shape of the photons that carry the qubits [2]. Last but not least, in order to be used in advanced applications like quantum repeaters, pairs of memories that can interact with each other are desired. We have recently shown that we can have two individual atoms in the same optical cavity mode and use them as Random Access Quantum Memories for more than 10 qubits with high fidelity and low cross talk [3].

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

[2] O. Morin et al., Phys. Rev. Lett. 123, 133602 (2019).

[3] S. Langenfeld et al., in preparation (2019).