Classical simulation of quantum entanglement using optical transverse modes in multimode waveguides

We discuss ``mode-entangled states'' based on the optical transverse modes of the optical field propagating in multimode waveguides, which are classical simulation of the quantum entangled states. The simulation is discussed in detail, including the violation of the Bell inequality and the correlation properties of optical pulses' group delays. The research on this simulation may be important, for it not only provides useful insights into fundamental features of quantum entanglement, but also yields interesting insights into quantum computation and quantum communication.