Molecular prototypes for spin-based CNOT quantum gates
  We show that a chemically engineered structural asymmetry in [Tb2] molecular clusters renders the two weakly coupled Tb3+ spin qubits magnetically inequivalent. The magnetic energy level spectrum of these molecules meets then all conditions needed to realize a universal CNOT quantum gate. 
F. Luis, A. Repoll\'es, M. J. Mart\'inez-P\'erez, D. Aguil\`a, O.   Roubeau, D. Zueco, M. Evangelisti, A. Cam\'on, J. Ses\'e...
cond-mat.mes-hall