UROPS Project abstract: Quantum storage in a decoherence-free subspace

A system of three spin12 atoms allows the construction of a qubit in the subspace of total angular momentum j = 12 that is not a ected by any magnetic eld activity on the magnetic moments of the atoms, provided that all three atoms experience the same magnetic eld. If, however, there are stray elds of di erent direction or strength at the sites of the atoms, the qubit will slowly decohere. It is the objective of this study to examine the decoherence process and to establish the conditions, under which the lifetime of the qubit is su ciently long for practical uses.