Add ExponentialUtilities backend back #523
Description
It may help us resolve the issues described in this post: https://discourse.julialang.org/t/simulating-quantum-hamiltonian-evolution-with-yao/117287/6
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It may help us resolve the issues described in this post: https://discourse.julialang.org/t/simulating-quantum-hamiltonian-evolution-with-yao/117287/6