Quantum communication cost of preparing multipartite entanglement

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787474

Kruszynska, Caroline; Duer, Wolfgang; Briegel, Hans J ^[1]; Anders, Simon ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Innsbruck, Technikerstrasse 25, 6020 Innsbruck (Austria)

We study the preparation and distribution of high-fidelity multiparty entangled states via noisy channels and operations. In the particular case of Greenberger-Horne-Zeilinger and cluster states, we study different strategies using bipartite or multipartite purification protocols. The most efficient strategy depends on the target fidelity one wishes to achieve and on the quality of transmission channel and local operations. We show the existence of a crossing point beyond which the strategy making use of the purification of the state as a whole is more efficient than a strategy in which pairs are purified before they are connected to the final state. We also study the efficiency of intermediate strategies, including sequences of purification and connection. We show that a multipartite strategy is to be used if one wishes to achieve high fidelity, whereas a bipartite strategy gives a better yield for low target fidelity.

• OSTI ID: 20787474
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DATA TRANSMISSION
DISTRIBUTION
EFFICIENCY
ENERGY LEVELS
INFORMATION THEORY
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS