Perfect transfer of m-qubit GHZ states
  By using some techniques such as spectral distribution and stratification associated with the graphs, employed in [1,2] for the purpose of Perfect state transfer (PST) of a single qubit over antipodes of distance-regular spin networks and PST of a $d$-level quantum state over antipodes of pseudo-distance regular networks, PST of an m-qubit GHZ state is investigated. To do so, we employ the particular distance-regular networks (called Johnson networks) J(2m,m) to transfer an m-qubit GHZ state initially prepared in an arbitrary node of the network (called the reference node) to the corresponding antipode, perfectly.   Keywords: Perfect state transferenc, GHZ states, Johnson network, Stratification, Spectral distribution   PACs Index: 01.55.+b, 02.10.Yn 
M. A. Jafarizadeh, R. Sufiani, S. F. Taghavi and E. Barati