Towards the ultimate test on the discrimination between classical and quantum theories exploiting photonic platforms
Quantum mechanics is a well-established theory which allows to predict the behavior of physical systems. However, there is an ongoing debate on the interpretations of some of its most relevant feature, including superposition, wave-particle duality, or entanglement. A large research effort has been devoted in the last decades to develop quantitative tests able to discriminate purely quantum with classical behaviours. Notable examples are provided by Bell¿s inequalities, which aim at studying the presence of correlations incompatible with locality and realistic assumptions. Other examples are provided by the Wheeler delayed choice experiment, which aim at studying the counterintuitive feature of wave-particle duality. In this framework, recent results have been reported showing how to combine entanglement with this property. Furthermore, very recently, causal structures have been identified as significant tool to identify new tests for the discrimination of quantum and classical behaviour in a mutlipartite system.
This project aims at performing an experimental study to combine entanglement in a Bell scenario with a delayed choice structure. Modeling of causal structures will be employed to define suitable inequalities to be tested. The funding will be employed to buy a certified quantum random number generator from ID Quantique, which is currently not available in the Quantum Information Lab. The quantum random number generator will be employed throughout the test to avoid predetermined choice of the causal structures.