Design of Gates for Quantum Computation: The Three-Spin XOR Gate in Terms of Two-Spin Interactions
Dima Mozyrsky, Vladimir Privman, Steven P. Hotaling · International Journal of Modern Physics B · 1998
We propose to design multispin quantum gates in which the input and output two-state systems (spins) are not necessarily identical. We describe the motivations for such studies and then derive an explicit general two-spin interaction Hamiltonian which accomplishes the quantum XOR gate function for a system of three spins: two input and one output.