Abstract
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.
Item Type: | Journal article |
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Faculties: | Physics |
Subjects: | 500 Science > 530 Physics |
ISSN: | 0031-9007 |
Language: | English |
Item ID: | 47644 |
Date Deposited: | 27. Apr 2018, 08:13 |
Last Modified: | 07. May 2024, 18:20 |