%0 Journal Article %B J. Phys. A: Math. Theor %D 2013 %G eng %P 235301 %R 10.1088/1751-8113/46/23/235301 %T Initial states of qubit–environment models leading to conserved quantities %U https://doi.org/10.1088%2F1751-8113%2F46%2F23%2F235301 %V 46 %8 may