Multi-bit state information transfer on the spin chain of one dimensional quantum dot array

The evolution operator is first used to act on the initial state after its Taylor expansion．The annihilation operator and production operator are then employed in acting on single bit state．The quantum information of the multi-bit state on the spin chain of one-dimensional quantum dot array can finally be transferred perfectly by using this method．By calculating the probability amplitude from the initial state to the final state, when the fidelity reaches 1, the perfect transfer of information is realized．It is found that when exchange interaction between adjacent quantum dots and spin chain length remain the same, larger of the number of bits in fidelity transfer, shorter the transfer time is．