Temporal Bell Inequalities Research Articles

Testing temporal Bell inequalities through repeated measurements in rf-SQUIDs

Temporal Bell-like inequalities are derived taking into account the influence of the measurement apparatus on the observed magnetic flux in an rf-SQUID. Quantum measurement theory is shown to predict violations of these inequalities only when the flux states corresponding to opposite current senses are not distinguishable. Thus rf-SQUIDs cannot help to discriminate realism and quantum mechanics at the macroscopic level.

Proposed test for temporal Bell inequalities.

Temporal Bell inequalities can be violated for sequences of events (histories) for which probabilities satisfying consistent sum rules cannot be defined. We discuss possible experiments in which such violations, never observed so far, may indeed be seen. The basic scheme, which uses three optically driven and mutually interacting two-level systems, could be implemented in a variety of nanostructures. It could even be mapped onto the dynamics of a single electron four-level system thus allowing for a realization in atomic physics.