Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.25: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

High-fidelity quantum repeater using cavity-QED and bright 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 exploit solely the cavity QED evolution for the entire quantum repeater scheme and, thus, avoid the usage of two-qubit quantum logical gates. In our previous paper [1], we already proposed a dynamical quantum repeater scheme in which the entanglement between the two neighboring repeater nodes was distributed using weak pulses of coherent light, while the obtained entangled pairs were purified using ancillary entangled states. In this work, the entanglement distribution is realized with the help of bright coherent-light pulses which involve hundreds of photons, while the entanglement purification avoids the usage of ancillary entangled resources. Our repeater scheme exhibits high fidelities and reasonable probabilities of success providing an efficient and experimentally feasible platform for long-distance quantum communication.

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