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 multi-mode waveguides, which are classical analogs of the quantum entangled states. The analogs are discussed in detail, including the violation of the Bell inequality and the correlation properties of optical pulses' group delays. The research on these analogs may be important, for it not only provides useful insights into fundamental features of quantum entanglement, but also yields new insights into quantum computation and quantum communication. 
Jian Fu, Zhijian Si, Shaofang Tang, and Jian Deng