2007/08/23 by Y. -J. Han, Han, Y. -J., L. -M. Duan +1
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.0708.3119
withdrawn by the authors because of an error
arxiv created 2007/08/28 · arxiv updated 2009/12/01
withdrawn by the authors because of an error.