Quantum computing through electron propagation in edge states of quantum spin Hall systems Wei Chen, Zheng-Yuan Xue, Z.D. Wang, Rui Shen and Ding Yu Xing Eur. Phys. J. B, 87 3 (2014) 57 Published online: 05 March 2014 DOI: 10.1140/epjb/e2014-40899-4