Entanglement of photons in their dual wave-particle nature.

Rab A. S., Polino E., Man Z.-X., Ba An N., Xia Y.-J., Spagnolo N., Lo Franco R., Sciarrino F.
  Lunedì 11/09   14:30 - 18:30   Aula A224   II - Fisica della materia
Wave-particle duality is the most fundamental description of the nature of a quantum object which behaves like a classical particle or wave depending on the measurement apparatus, while entanglement represents nonclassical correlations of composite quantum systems. Whether wave-particle superposition and entanglement can emerge simultaneously remains an open issue. In this contribution we introduce and experimentally realize a scalable all-optical scheme that deterministically generates wave-particle entanglement of two photons, $A$ and $B$, in the state: $|\Phi\rangle_{AB}=\frac{1}{\sqrt{2}} (| wave \rangle_{A} | wave \rangle_{B} + | particle \rangle_{A} | particle \rangle_{B})$, where the single-photon states $| wave \rangle$, $| particle \rangle$ are defined so that they represent, respectively, the capacity and the incapacity of the photon to produce interference.