  We introduce a scheme for perfect state transfer in regular two and three
dimensional structures. The interactions on the lattices are of XX spin type
with uniform couplings. In two dimensions the structure is a hexagonal lattice
and in three dimensions it consists of hexagonal planes joined to each other at
arbitrary points. We will show that compared to other schemes, i) much less
control is needed for routing, ii) the algebra of global control is quite
simple, iii) the same kind of control can upload and download qubit states to
or from built-in Read-Write (RW) heads. Pivotal use is made of a quantum switch
which we introduce and call it Hadamard switch, since its operation depends on
the existence of a Hadamard matrix in four dimensions.
