Fan, Hong-yi; Xu, Xue-xiang; Hu, Li-yun - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 10, pp. 2014-2019
We study statistical properties of the Hamiltonian (H=ωa†a+κa†N+1+κN+1a) generating phase state. Using the generalized Hellmann–Feynman theorem for ensemble average, we derive its mean energy and find the ratio of the mean energies contributed from the term a†a to that from...