Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically

We analyze a new type of discrete time crystalline behavior that is obtained by periodically driving exchange interactions in a Heisenberg spin chain. This behavior is shown to benefit the protection and manipulation of multi-spin quantum states. We use these ideas to further construct a time-crystal-inspired CZ gate between singlet-triplet qubits with high fidelity. Our results indicate that periodically driving exchange couplings can enhance the performance of quantum dot spin systems for quantum information applications.