Tunneling and Speedup in Quantum Optimization for Permutation-Symmetric Problems
Siddharth Muthukrishnan, Tameem Albash, Daniel A. Lidar · Physical Review X · 2016
It is commonly believed that quantum tunneling is necessary for a quantum speedup in quantum annealing, but a theoretical demonstration shows that quantum tunneling is not always the most efficient way to yield a quantum speedup.