A Fast, Clock-Transition-Protected CNOT Gate with Molecular Nanomagnet Dimers*

This research is focused on simulations of molecular nanomagnets (MNMs), compounds that act like isolated quantum spins. MNMs are well-studied and chemically engineerable with the right tools, which makes them interesting to look at as spin qubit - or quantum bit - candidates. We are extending previous work done on dimers of the MNM Cr7Mn, exploring schemes for using the interaction of the spins in a dimer system to perform two-qubit gates that are protected from dissipation over time by clock transitions in each monomer. In earlier research, RF pulses were followed by a period of free evolution of spin states. In this research, the scheme is purely active, the transition coming from a single RF pulse and so will be significantly faster. Our first goal in this research was to simulate a CNOT gate, one of the fundamental two qubit gates. To do this, we simulate the effects of radio frequency pulses, tuning them to see whether we can selectively drive transitions between states depending on the state of our control qubit and the frequency of our pulse. We will present our promising preliminary results, and discuss future improvements and the possibility of experimental realization of this scheme.