Genuine multipartite entanglement detection with imperfect measurements: concept and experiment
arxiv(2023)
摘要
Standard procedures for entanglement detection assume that experimenters can
exactly implement specific quantum measurements. Here, we depart from such
idealizations and investigate, in both theory and experiment, the detection of
genuine multipartite entanglement when measurements are subject to small
imperfections. For arbitrary qubits number n, we construct multipartite
entanglement witnesses where the detrimental influence of the imperfection is
independent of n. In a tabletop four-partite photonic experiment we
demonstrate first how a small amount of alignment error can undermine the
conclusions drawn from standard entanglement witnesses, and then perform the
correction analysis. Furthermore, since we consider quantum devices that are
trusted but not perfectly controlled, we showcase advantages in terms of noise
resilience as compared to device-independent models.
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