Demonstration of controllable temporal distinguishability in a three-photon state B. H. Liu, F. W. Sun, Y. X. Gong, Y. F. Huang, Z. Y. Ou and G. C. Guo EPL, 77 2 (2007) 24003 Published online: 17 January 2007 DOI: 10.1209/0295-5075/77/24003