Issue
EPL
Volume 85, Number 1, January 2009
Article Number 14001
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/85/14001
Published online 07 January 2009
EPL, 85 (2009) 14001
DOI: 10.1209/0295-5075/85/14001

A new analysis of multi-photon interference

Lei Chen, Chuan-Feng Li, Ming Gong, Fang-Wen Sun and Guang-Can Guo

Key Laboratory of Quantum Information University of Science and Technology of China, CAS - Hefei, 230026, PRC

cfli@ustc.edu.cn

received 10 July 2008; accepted in final form 25 November 2008; published January 2009
published online 7 January 2009

Abstract
We consider photons as wave packets in time domain and analyze the Hong-Ou-Mandel$\hbox{--} $type interferences in different conditions. The general analytic formula of the 2N-photon interference is deduced. It is shown that the widths of the time interval distributions of the 2N-fold coincidence are proportional to the widths of the photon wave packets and inversely proportional to $\sqrt{N} $. Good agreement between previous experimental results and our theory for 2- and 4-photon interferences confirms the validity of this method. The method is also generalized to multi-beam interference and some new phenomena compared with two-beam interference are obtained.

PACS
42.50.-p - Quantum optics.
03.67.-a - Quantum information.

© EPLA 2009