Scalable multi-particle entanglement of trapped ions

2005/11/30 by H. Häffner, Hartmut Häffner, H. Haeffner +21 · 134 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1038/nature04279

published as Nature 438, 643-646 (2005)

openalex publication_date 2005/11/30 · crossref created 2005/11/30 · crossref issued 2005/12/01 · crossref published 2005/12/01 · crossref published-print 2005/12/01 · arxiv created 2006/03/23 · arxiv updated 2009/12/01 · crossref deposited 2023/05/18 · openalex created_date 2025/10/10 · crossref indexed 2026/07/14 · openalex updated_date 2026/07/29

Abstract

Among the various kinds of entangled states, the 'W state' plays an important role as its entanglement is maximally persistent and robust even under particle loss. Such states are central as a resource in quantum information processing and multiparty quantum communication. Here we report the scalable and deterministic generation of four-, five-, six-, seven- and eight-particle entangled states of the W type with trapped ions. We obtain the maximum possible information on these states by performing full characterization via state tomography, using individual control and detection of the ions. A detailed analysis proves that the entanglement is genuine. The availability of such multiparticle entangled states, together with full information in the form of their density matrices, creates a test-bed for theoretical studies of multiparticle entanglement. Independently, -Greenberger-Horne-Zeilinger- entangled states with up to six ions have been created and analysed in Boulder.

Citations

• Three qubits can be entangled in two inequivalent ways
• Entanglement of Formation of an Arbitrary State of Two Qubits
• Die gegenw�rtige Situation in der Quantenmechanik
• Multiparty quantum communication complexity

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