NON-EQUIVALENCE OF THE TWO DEFINITIONS OF THE TWO-PHOTON COHERENT STATE

Peng Zhou, 彭金生

Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.

Z. Y. Ou

Bruce W. Shore

BASIC PRINCIPLES AND DEFINITIONS Elementary Atoms TWO-STATE ATOMS The Schrvdinger Atom Beyond the Rotating-Wave Approximation Pulsed Excitation Statistical Atoms The Heisenberg Atom The Bloch and Lorentz Atoms PHOTONS AND RADIATION Free Fields: Photons Photon-Atom Dynamics The Scattered Field Spectrum Propagation.

Reinhard Honegger, Alfred Rieckers

LU HONG, Guo Guang-Can, (1)佛山科学技术学院应用物理与通信工程系，佛山 528000；中国科学技术大学物理系和非线性科学中心，合肥 230026; (2)中国科学技术大学物理系和非线性科学中心，合肥 230026

The superposition of two excited coherent states of identical intensity but different phases yields a state that can exhibit varied non-classical characteristics.Under suitable conditions,as the phase difference changes,the mean photon number of the super

NILOY KUMAR DUTTA