DISTANCE BETWEEN DENSITY OPERATORS IN MULTIPHOTON PROCESSES
张敬涛, 陈朝阳, 徐至展
DISTANCE BETWEEN DENSITY OPERATORS IN MULTIPHOTON PROCESSES
Zhang Jing-tao (张敬涛), Chen Zhao-yang (陈朝阳), Xu Zhi-zhan (徐至展)
中国物理B . 1999, (9): 657 -663 .  DOI: 10.1088/1004-423X/8/9/004