Abstract
We extend the Bell inequality known for two qubits to the four-level atom, including an artificial atom realized by the superconducting circuit, and qudit with j = 3/2. We formulate the extended inequality as the inequality valid for an arbitrary Hermitian nonnegative 4×4 matrix with unit trace for both separable and entangled matrices.
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†Based on the invited talk delivered by M. A. Man’ko at the 46th Winter Colloquium on the Physics of Quantum Electronics (PQE-2016, January 3–8, 2016, Snowbird, Utah, USA)
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Man’ko, M.A., Man’ko, V.I. Hidden Bell Correlations in the Four-Level Atom† . J Russ Laser Res 37, 1–9 (2016). https://doi.org/10.1007/s10946-016-9541-4
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DOI: https://doi.org/10.1007/s10946-016-9541-4