Purification for entangled multi-atom states via entanglement swapping;

Multi-party multi-level quantum key distribution protocol based on entanglement swapping;

Quantum authentication protocols based on entanglement swapping in distributed network;

A new type of anti-swinging intercross enwind way for the cable wire has been described in this article,the crane with this enwind way can reduce the height of the workshop,and decrease the construction costs of both workshop and the crane.

This article treats about the status on the new scientific problems of physics and electronics in the 21st century,involving vacuum energy,negative mass of electron,quantum potential,virtual particles,superstring theory and tachyons;as well as the EPR thinking experiment,quantum entanglement ,quantum teleportation,quantum information theory and quantum computers.