LAUSR

The single-bit quantum information perfect transfer determined only by the dynamic evolution of the system in a spin chain is investigated. Our results show that the quantum control of the above quantum information perfect transfer can be achieved by applying a low-intensity symmetric magnetic field to the spin chain. We have studied the influence of the magnetic field on the perfect transfer of quantum information in the arbitrary-length spin chain. It gives that the time of the quantum information perfect transfer is determined by applying the low-intensity magnetic field which is symmetric about the spin chain and whose difference value is constant between the closed lattices in the spin chain. Furthermore, we put forward a scheme to achieve the quantum control of quantum information perfect transfer in the arbitrarily-length spin chain by applying the magnetic field.