Decoherence-free subspaces

“Dynamically Generated Decoherence-Free Subspaces and Subsystems on Superconducting Qubits”, Reports on Progress in Physics 87, 097601, G. Quiroz, B. Pokharel, J. Boen, L. Tewala, V. Tripathi, D. Williams, L. Wu, P. Titum, K. Schultz, and D. A. Lidar. [link]