Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.33: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Practical quantum repeater using cavity-QED and optical coherent light — •Denis Gonta and Peter van Loock — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz

In the framework of cavity QED, we propose a practical quantum repeater scheme that uses coherent light and chains of atoms coupled to optical cavities. In contrast to conventional schemes, we avoid the usage of two-qubit quantum logical gates by exploiting solely the cavity QED evolution. In our previous paper [1], we already proposed a dynamical quantum repeater scheme in which the entanglement between the two neighbouring repeater nodes was distributed using the controlled displacements of input coherent light, while the generated low-fidelity entangled pairs were purified using ancillary (four-partite) entangled states. In this work, the entanglement distribution is realized using the controlled phase shifts of input coherent light, while the entanglement purification avoids the usage of ancillary entangled resources. Our repeater scheme exhibits reasonable fidelities and repeater rates providing an attractive platform for long-distance quantum communication.

[1] D. Gonta and P. van Loock, Phys. Rev. A 88, 052308 (2013).