4.8 Article

Constructing Local Models for General Measurements on Bosonic Gaussian States

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PHYSICAL REVIEW LETTERS
卷 131, 期 11, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.131.110202

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We present a simple sufficient criterion to determine the locality of correlations obtained from measurements on a Gaussian quantum state. The criterion involves the construction of a local-hidden-variable model that utilizes a portion of the inherent Gaussian noise of the state for the measurements. We demonstrate the application of our criterion in the context of displaced photodetection on a two-mode squeezed state, where it reveals the presence of a local-hidden-variable model for a specific range of parameters despite the entanglement of the state.
We derive a simple sufficient criterion for the locality of correlations obtained from given measurements on a Gaussian quantum state. The criterion is based on the construction of a local-hidden-variable model that works by passing part of the inherent Gaussian noise of the state onto the measurements. We illustrate our result in the setting of displaced photodetection on a two-mode squeezed state. Here, our criterion exhibits the existence of a local-hidden-variable model for a range of parameters where the state is still entangled.

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