Under barren plateau gradient decay, SPSA-optimized VQEs need exponentially more iterations and measurements to reach a fixed relative gradient-energy accuracy.
Training variational quantum algorithms is np-hard.Physical review letters, 127(12):120502, 2021
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From Barren Plateaus to SPSA Optimization in Variational Quantum Eigensolvers
Under barren plateau gradient decay, SPSA-optimized VQEs need exponentially more iterations and measurements to reach a fixed relative gradient-energy accuracy.