Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 7: Ultra-cold atoms, ions and BEC I (joint session A/Q)

A 7.6: Talk

Tuesday, March 15, 2022, 11:45–12:00, A-H2

Fibre cavity based quantum network node with trapped Yb ion — •Santhosh Surendra, Pascal Kobel, Ralf Berner, Moritz Breyer, and Michael Köhl — Physikalisches institute, University of Bonn, Bonn, Germany

Quantum networks are promising to revolutionise information exchange and cryptography. An important part of these networks are nodes where quantum states can be stored, and manipulated. In this work, we investigate such a quantum communication node formed by a trapped Yb ion coupled to an optical fibre cavity. Using a resonant fibre cavity for the electric dipole transition at 370nm, we are able to collect the emitted photons with high efficiency, which carry quantum information from node to node via their polarisation. We use pulsed excitation to realise a fibre coupled, deterministic single photon source, where the photons are entangled with the hyperfine states of the ion with a high fidelity of 90.1(17)%. The state of the trapped ion represents the quantum memory, which is used to realise a memory enhanced quantum key distribution protocol (BBM92), being the first step towards realising a quantum repeater node.