Proposed Bell Experiment with Genuine Energy-Time Entanglement

Franson’s Bell experiment with energy-time entanglement [Phys. Rev. Lett. 62, 2205 (1989)] does not rule out all local hidden variable models. This defect can be exploited to compromise the security of Bell inequality-based quantum cryptography. We introduce a novel Bell experiment using genuine energy-time entanglement, based on a novel interferometer, which rules out all local hidden variable models. The scheme is feasible with actual technology.

Figure 1

Generic setup of the Franson Bell experiment.

Figure 2

The generic setup of the proposed energy-time (and time-bin) Bell experiment.