NMR quantum computation with indirectly coupled gates
David C. Collins, K. W. Kim, William C. Holton, Hanna Sierzputowska‐Gracz, Edward O. Stejskal · Physical Review A · 2000
An NMR realization of a two-qubit quantum gate which processes quantum information indirectly via couplings to a spectator qubit is presented in the context of the Deutsch-Jozsa algorithm. This enables a successful comprehensive NMR implementation of the Deutsch-Jozsa algorithm for functions with three argument bits and demonstrates a technique essential for multi-qubit quantum computation.