The variances in a single-mode squeezed vacuum state

In this research paper, we calculate the variances in single-mode pure and mixed-squeezed vacuum states. Direct relationships between the variances and the mean number of photons, present in the coherent state of the mode, are obtained. The results assure that the squeezed states have less uncertainty in one quadrature than the coherent state. Some interesting properties of the squeezed states are followed as consequences of introducing the P-representation to describe the state of the mode.