Experimental implementation of higher dimensional time-energy entanglement.

Qudit entangled states have proven to offer significant advantages with respect to qubit states regarding the implementation of quantum cryptography or computation schemes. Here we propose and experimentally implement a scalable scheme for preparing and analyzing these states in the time-energy degree of freedom of two-photon pairs. Using the scheme, the entanglement of (2×4)-dimensional states is demonstrated. [ABSTRACT FROM AUTHOR]