Electrical Readout of Individual Nuclear Spin Trajectories in a Single-Molecule Magnet Spin Transistor

We present the electrical readout of time trajectories obtained from an isolated nuclear spin. The device, a TbPc2 single-molecule magnet spin transistor, detects the four different nuclear spin states of the Tb3+ ion with fidelities better than 69%, allowing us to measure individual relaxation times (T-1) of several tens of seconds. A good agreement with quantum Monte Carlo simulations suggests that the relaxation times are limited by the current tunneling through the transistor, which opens up the possibility to tune T-1 electrically by means of bias and gate voltages.