2019/10/20 by Sergey Bravyi, Alexander Kliesch, Robert Koenig +1 · 4 citations
Physics and Astronomy · #quant-ph #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.125.260505
published as Phys. Rev. Lett. 125, 260505 (2020) · 16 pages
arxiv created 2019/10/20 · arxiv updated 2020/12/25
Local Hamiltonians with topological quantum order exhibit highly entangled ground states that cannot be prepared by shallow quantum circuits. Here, we show that this property may extend to all low-energy states in the presence of an on-site ℤ2 symmetry. This proves a version of the No Low-Energy Trivial States (NLTS) conjecture for a family of local Hamiltonians with symmetry protected topological order. A surprising consequence of this result is that the Goemans-Williamson algorithm outperforms the Quantum Approximate Optimization Algorithm (QAOA) for certain instances of MaxCut, at any constant level. We argue that the locality and symmetry of QAOA severely limits its performance. To overcome these limitations, we propose a non-local version of QAOA, and give numerical evidence that it significantly outperforms standard QAOA for frustrated Ising models on random 3-regular graphs.