Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

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

Q 41.5: Talk

Thursday, March 12, 2020, 12:15–12:30, e001

Photon entanglement distribution using a single trapped ion as quantum memory — •Martin Steinel, Matthias Kreis, Jan Arenskötter, Stephan Kucera, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken

The generation of remote entanglement at long distances is a fundamental component in quantum networks. To achieve long distance entanglement through a fiber network, quantum repeaters [1] operating on quantum memories (QM) must be employed. Focusing on trapped ions as QMs [2-4] in a quantum repeater cell [5] we compare several protocols quantitatively with numerical simulations in terms of qubit rate and background contributions. Implemented as a finite state machine, we simulate an emission protocol for a single qubit QM consecutively emitting two entangled photons, and an absorption protocol. In the latter, two entangled photon pairs are generated by SPDC and one partner of each pair is absorbed consecutively by the QM. The necessary Bell state measurement is performed by projection of heralds of absorption and the final atomic state, that allows to distinguish all four Bell states. The simulations are compared with two qubit QM schemes in terms of efficiencies and experimental parameters of our existing setup and possible future developments.

[1] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998)

[2] C. Kurz et al., Nat. Commun. 5, 5527 (2014)

[3] C. Kurz et al., Phys. Rev. A 93, 062348 (2016)

[4] M. Bock et al., Nat. Commun. 9, 1998 (2018)

[5] C. Panayi et al., New J. Phys. 16, 043005 (2014)