Determining the computational power of symmetry protected topological phases
David T. Stephen, Dongsheng Wang, Abhishodh Prakash, Tzu-Chieh Wei, Robert Raussendorf · arXiv (Cornell University) · 2016
We identify certain classes of 1D symmetry-protected topological (SPT) phases in which almost every state is universal for measurement based quantum computation (MBQC) in 1D. By developing a general scheme to extract the useful entanglement from SPT ordered states, we can associate to each of these phases a Lie group of executable gates. We then show how to determine this Lie group from the cohomological description of SPT phases, thereby affirming the compelling link between SPT order and the computational power of 1D resource states.