Experimental hierarchy of the nonclassicality of single-qubit states via potentials for entanglement, steering, and Bell nonlocality

• URL: http://arxiv.org/abs/2309.12878v2
• Date: Wed, 10 Jan 2024 19:19:30 GMT
• Title: Experimental hierarchy of the nonclassicality of single-qubit states via potentials for entanglement, steering, and Bell nonlocality
• Authors: Josef Kadlec, Karol Bartkiewicz, Anton\'in \v{C}ernoch, Karel Lemr and Adam Miranowicz
• Abstract summary: Entanglement potentials are a promising way to quantify the nonclassicality of single-mode states. We generalize the idea of entanglement potentials to other quantum correlations. We experimentally test this concept using specially tailored polarization-encoded single-photon states.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement potentials are a promising way to quantify the nonclassicality of single-mode states. They are defined by the amount of entanglement (expressed by, e.g., the Wootters concurrence) obtained after mixing the examined single-mode state with a purely classical state; such as the vacuum or a coherent state. We generalize the idea of entanglement potentials to other quantum correlations: the EPR steering and Bell nonlocality, thus enabling us to study mutual hierarchies of these nonclassicality potentials. Instead of the usual vacuum and one-photon superposition states, we experimentally test this concept using specially tailored polarization-encoded single-photon states. One polarization encodes a given nonclassical single-mode state, while the other serves as the vacuum place-holder. This technique proves to be experimentally more convenient in comparison to the vacuum and a one-photon superposition as it does not require the vacuum detection.

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