DYNAMICAL SQUEEZING OF PHOTON-ADDED COHERENT STATES

We study the dynamical squeezing of the photon-added coherent state (P ACS) due to a time dependence of the frequency of the electromagnetic field oscillator in a cavity or a vibrational frequency of an ion insi de an electromagnetic trap. Explicit expressions for the time dependen ce of various functions characterizing the quantum state, such as the photon distribution, the Wigner function, the mean values and variance s of the quadrature components and of the photon number, show that the dynamically squeezed PACS possesses a larger squeezing coefficient th an the usual squeezed states. The dynamical squeezing is accompanied b y a change of the sub-Poissonian photon statistics to the super-Poisso nian one. [S1050-2947(98)07410-1].