The Von-Neumann entropy function links the entropy of a bulk material to discretised portions of the quantum information . In the case of a pure state, there is a maximum in the total knowledge of the system and each state in the system can be uniquely defined. This will subsequently correspond to zero entropy. On the other hand, if we have a mixed state where the magnitude of information is proportional to the number of microstates , then there will be non-zero amounts of both information and entropy. Analytically the entropy function takes the form