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Conference on Lasers and Electro-Optics

Verifying Multi-Partite Entanglement with a Few Detection Events

Lee A. Rozema, Valeria Saggio, Aleksandra Dimić, Chiara Greganti, Philip John Walther, Borivoje Dakić

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We introduce a new entanglement-verification method and use it to experimentally verify the entanglement in a photonic six-qubit cluster state, created at telecommunication wavelengths, by detecting only 20 copies of the quantum state.
DOI
10.1364/cleo_qels.2019.fm2m.7

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Certifying entanglement of a multipartite state is generally considered a demanding task. Since an N qubit state is parametrized by 4^{N}-1 real numbers, one might naively expect that the measurement effort of generic entanglement detection also scales exponentially with N. Here, we introduce a general scheme to construct efficient witnesses requiring a constant number of measurements independent of the number of qubits for states like, e.g., Greenberger-Horne-Zeilinger states, cluster states, and Dicke states. For four qubits, we apply this novel method to experimental realizations of the aforementioned states and prove genuine four-partite entanglement with two measurement settings only.