Verifying genuine multipartite entanglement of the whole from its separable parts

• URL: http://arxiv.org/abs/2008.01599v1
• Date: Tue, 4 Aug 2020 14:37:37 GMT
• Title: Verifying genuine multipartite entanglement of the whole from its separable parts
• Authors: Michal Mi\v{c}uda, Robert St\'arek, Jan Provazn\'ik, Olga Leskovjanov\'a, Ladislav Mi\v{s}ta, Jr
• Abstract summary: We prove experimentally the predicted existence of a three-qubit quantum state with genuine multipartite entanglement. We find numerically a fully decomposable entanglement witness acting nontrivially only on the reductions of the global state.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We prove experimentally the predicted existence of a three-qubit quantum state with genuine multipartite entanglement which can be certified solely from its separable two-qubit reduced density matrices. The qubits are encoded into different degrees of freedom of a pair of correlated photons and the state is prepared by letting the photons to propagate through a linear optical circuit. The presence of genuine multipartite entanglement is verified by finding numerically a fully decomposable entanglement witness acting nontrivially only on the reductions of the global state. Our result confirms viability of detection of emerging global properties of composite quantum systems from their parts which lack the properties.

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