Effects of leakage on the realization of a discrete time crystal in a chain of singlet-triplet qubits

A chain of singlet-triplet qubits can be an excellent realization the Ising model, which is in turn a good platform for realizing discrete time crystal (DTC). However, leakage out their computational subspace may problem such realization. The authors show that, while indeed serious DTC, it not insurmountable - one mitigate by applying magnetic field that alternates from qubit to next.