%0 Journal Article %T The ping-pong protocol can be attacked without eavesdropping %A Qing-yu Cai %J Physics %D 2004 %I arXiv %R 10.1103/PhysRevLett.91.109801 %X Attack the ping-pong protocol without eavesdropping. %U http://arxiv.org/abs/quant-ph/0402052v1