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A Sensitive Nonclassicality Certification Functional for Continuous-Variable Systems
If the phase space-based Glauber-Sudarshan distribution, $P_{\varrho}$, has negative values the quantum state, $\varrho$, it describes is nonclassical. Due to $P$'s singular behaviour this simple criterion is impractical to use. Recent work [Bohmann and Agudelo, Phys. Rev. Lett. 124, 133601 (2020)]
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