Experimental Test of Temporal Bell Inequalities at the Mesoscopic Level
The extrapolation of the quantum formalism to the macrolevel leads naturally to the existence of systems in physical states exhibiting quantum coherence between macroscopically distinguishable parts. Such systems are generically called Schroedinger cats and their possible generation and detection is a question of great interest in the study of the relationship between quantum and classical physics. In particular, Leggett and Gargl have shown that the conjunction of the very general assumptions of macroscopic realism and non invasive measurability is incompatible with the predictions of quantum mechanics. This result, which allows the formalization of the Schroedinger cat paradox by means of an inequality to be fulfilled by any realist theory obeying the two assumptions quoted above, opens the possibility for an experimental test between quantum mechanics and a broad class of realist theories*. However, the observation of discrepancies in a real experiment is extremely difficult when truly macroscopic systems are involved and violations of Leggctt-Garg type inequalities have not been reported so far.
KeywordsRealist Theory Classical Physic Quantum Coherence Distinguishable Part Bell Inequality
- 2.S. F. Huelga, T. W. Marshall and E. Santos, Proposed test for Realist Theories using Rydberg atoms coupled to High-Q resonators. Phys. Rev. A. To appear.Google Scholar