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Quantum twisted double-slits experiments: confirming wavefunctions’ physical reality

Are quantum states real? This most fundamental question in quantum mechanics has not yet been satisfactorily

resolved, although its realistic interpretation seems to have been rejected by various delayedchoice

experiments. Here, to address this long-standing issue, we present a quantum twisted double-slit

experiment. By exploiting the subluminal feature of twisted photons, the real nature of a photon during

its time in flight is revealed for the first time. We found that photons’ arrival times were inconsistent with

the states obtained in measurements but agreed with the states during propagation. Our results demonstrate

that wavefunctions describe the realistic existence and evolution of quantum entities rather than a

pure mathematical abstraction providing a probability list of measurement outcomes. This finding clarifies

the long-held misunderstanding of the role of wavefunctions and their collapse in the evolution of

quantum entities.

Fig. 1. Schematic illustration of the quantum twisted double-slit experiment.

This work is accepted Science Bulletin.