An illustrative experiment described by Grangier, Roger and Aspect (GRA), being built around a single beam splitter (BS) revealing corpuscle behaviour through analysis of the transmitted and reflected beams coincidence counts, and later integrated into a Mach-Zehnder (MZ). An illustrative experiment described by Grangier, Roger and Aspect (GRA), being built around a single beam splitter (BS) revealing corpuscle behaviour through analysis of the transmitted and reflected beams coincidence counts, and later integrated into a Mach-Zehnder (MZ). Diagram of entangled photon generation: A pump beam induces type-I spontaneous parametric down-conversion (SPDC) in a nonlinear crystal, producing a polarization-entangled photon pair (signal and idler modes). The pair is input to a 50:50 beam splitter, 700-1100nm creating path-entangled output. Optical lossless beam splitters are frequently encountered in fundamental physics experiments regarding the nature of light, including “which-way” determination of light particles, N. Bohr's complementarity principle, or the EPR paradox and all their measurement apparatus. Although they look as. Given this model, we can conceptualize the state associated with a given point in a deter-ministic circuit by listing the values of the bits on each of the wires in the circuit. In addition to the task of dividing light, beamsplitters can be employed to recombine two separate light beams or images into a single path. Output states from beam splitters under different inputs such as single photons entering through one port, two photons entering through the two. Grangier, Roger and Aspect (GRA) performed a beam-splitter experiment to demonstrate the particle behaviour of light and a Mach-Zehnder interferometer experiment to demonstrate the wave behaviour of light.