title: Exploration of multiphoton entangled states by using weak nonlinearities.
abstract: We propose a fruitful scheme for exploring multiphoton entangled states based on linear optics and weak nonlinearities. Compared with the previous schemes the present method is more feasible because there are only small phase shifts instead of a series of related functions of photon numbers in the process of interaction with Kerr nonlinearities. In the absence of decoherence we analyze the error probabilities induced by homodyne measurement and show that the maximal error probability can be made small enough even when the number of photons is large. This implies that the present scheme is quite tractable and it is possible to produce entangled states involving a large number of photons.
authors.affiliation: College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China.
authors.forename: Ying-Qiu
authors.initials: YQ
authors.lastname: He
authors.affiliation: College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China.|Department of Basic Curriculum, North China Institute of Science and Technology, Beijing 101601, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Ding
authors.affiliation: College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China.
authors.forename: Feng-Li
authors.initials: FL
authors.lastname: Yan
authors.affiliation: College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Gao