Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Poster Quanteninformation
Q 34.4: Poster
Tuesday, March 20, 2007, 16:30–18:30, Poster C
Entanglement purification for all graph states — •Caroline Kruszynska1,2, Akimasa Miyake1,2, Hans Briegel1,2, and Wolfgang Dür1,2 — 1Institut für theoretische Physik, Universität Innsbruck. Austria — 2Institut für Quantenoptik und Quanteninformation der ÖAW, Innsbruck, Austria
We present multiparty entanglement purification protocols that are capable of purifying arbitrary graph states directly. We have developed recurrence and breeding protocols and compared our methods with strategies based on bipartite entanglement purification in static and communication scenarios. In a static scenario, the parties get several copies of given noisy multiparty entangled states, while in communication scenarios, they are allowed to generate (arbitrary) multiparty states locally before distributing them through noisy quantum channels. We found that direct multiparty purification is of advantage with respect to achievable yields and minimal required fidelity in static scenarios, and with respect to obtainable fidelity in the case of noisy operations in both scenarios. The work is published in Phys. Rev. A 74, 052316 (2006).