Simple schemes for generation ofW-type multipartite entangled states and realization of quantum-information concentration
Deng-Yu Zhang, Shi-Qing Tang, Xie Li-Jun, Zhan Xiao-Gui, Yinhua Chen, Gao Feng · Chinese Physics B · 2010
We propose simple schemes for generating W -type multipartite entangled states in cavity quantum electrodynamics (CQED). Our schemes involve a largely detuned interaction of Λ-type three-level atoms with a single-mode cavity field and a classical laser, and both the symmetric and asymmetric W states can be created in a single step. Our schemes are insensitive to both the cavity decay and atomic spontaneous emission. With the above system, we also propose a scheme for realizing quantum-information concentration which is the reverse process of quantum cloning. In this scheme, quantum-information originally coming from a single qubit, but now distributed into many qubits, is concentrated back to a single qubit in only one step.