Orientation entanglement and temporal Bell inequalities
Résumé
We introduce Bell-type inequalities detecting correlations between spatial orientations of two quantum angular momenta. In such inequalities, measurements are performed on each subsystem at different times. These times play the role of the polarizer angles in Bell tests realized with photons. In a first inequality, orientation correlations are the relevant observables. Orientation is then dichotomized by distinguishing "positively" and "negatively" oriented subsystems. We show that the proposed inequalities are violated by a large set of entangled states. The experimental realisation of such proposals can be performed using atoms or molecules. These results open new ways for practical entanglement tests in N-level and continuous variables quantum systems.
Domaines
Physique Quantique [quant-ph]
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