The hybrid optimizer QN-SPSA+PSR, mixing SPSA metric estimates with parameter-shift gradients, converges faster and more stably than QN-SPSA+SPSA on a 12-spin Ising model.
Quan- tum computational advantage using photons
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Variational Quantum Eigensolver: A Comparative Analysis of Classical and Quantum Optimizer Methods
The hybrid optimizer QN-SPSA+PSR, mixing SPSA metric estimates with parameter-shift gradients, converges faster and more stably than QN-SPSA+SPSA on a 12-spin Ising model.