Following a recent proposal (Phys. Rev. Lett. 85 (2000) 2392) about quantum information processing using dispersive atom–cavity interaction, in this paper, we proposed a physical scheme to concentrate the pure non-maximally entangled atomic states via cavity QED by using atomic collision in a...

In this paper, we propose a theoretical entanglement concentration protocol for unknown triparticle W class states, and then the physical implementation of this proposal has also been presented in cavity QED. The general protocol is mainly based on the appropriate Bell state measurements. In the...

In this paper, we first propose a general entanglement distillation protocol for three-particle W class states, which can concentrate the W′ state (non-maximally entangled W state). The general protocol is mainly based on the unitary transformations on the auxiliary particles and the entangled...