title: Generating multi-atom entangled W states via light-matter interface based fusion mechanism.
abstract: W state is a key resource in quantum communication. Fusion technology has been proven to be a good candidate for preparing a large-size W state from two or more small-size W states in linear optical system. It is of great importance to study how to fuse W states via light-matter interface. Here we show that it is possible to prepare large-size W-state networks using a fusion mechanism in cavity QED system. The detuned interaction between three atoms and a vacuum cavity mode constitute the main fusion mechanism, based on which two or three small-size atomic W states can be fused into a larger-size W state. If no excitation is detected from those three atoms, the remaining atoms are still in the product of two or three new W states, which can be re-fused. The complicated Fredkin gate used in the previous fusion schemes is avoided here. W states of size 2 can be fused as well. The feasibility analysis shows that our fusion processes maybe implementable with the current technology. Our results demonstrate how the light-matter interaction based fusion mechanism can be realized, and may become the starting point for the fusion of multipartite entanglement in cavity QED system.
authors.affiliation: School of Physics &Material Science, Anhui University, Hefei 230601, People's Republic of China.|Department of Mechanical and Electronic Engineering, Chizhou University, Chizhou 247000, People's Republic of China.
authors.forename: Xue-Ping
authors.initials: XP
authors.lastname: Zang
authors.affiliation: School of Physics &Material Science, Anhui University, Hefei 230601, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Information Technologies, Isik University, Sile, Istanbul, 34980, Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Ozaydin
authors.affiliation: Institute for Quantum Control and Quantum Information, School of Electronic and Information Engineering, Hefei Normal University, Hefei 230601, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Song
authors.affiliation: Institute for Quantum Control and Quantum Information, School of Electronic and Information Engineering, Hefei Normal University, Hefei 230601, People's Republic of China.
authors.forename: Zhuo-Liang
authors.initials: ZL
authors.lastname: Cao