Robustness of quantum gates operating on the high frequency modes of MnBr(CO)5

Quantum gates are optimized for the IR active high frequency modes of MnBr(CO)5-complexes. We investigate whether the selectivity for quantum gates is conserved for energetically close lying qubits of different symmetry that are nevertheless simultaneously addressable with the same laser pulse. The qubits are encoded in different vibrational normal modes, which are separated only by 50 cm-1. Furthermore the influence of additional non-qubit modes on the efficiency of the quantum gates optimized for the pure qubit system is studied. Potential perturbers are low frequency vibrational modes highly populated at room temperature or vibrational modes that seems predestined to interfere during the gate operation. To prevent translational motion, the possibility of spatial localization is explored by incorporation of the carbonyl complex in the unit cell of a MFI zeolite