Design of gates for quantum computation: the three-spin XOR gate in terms of two-spin interactions

摘要

We propose to design multispin quantum gates in which the input and outputtwo-state systems (spins) are not necessarily identical. We describe themotivations for such studies and then derive an explicit general two-spininteraction Hamiltonian which accomplishes the quantum XOR gate function for asystem of three spins: two input and one output.