The barren plateau phenomenon, characterized by loss gradients that vanish exponentially
with system size, poses a challenge to scaling variational quantum algorithms. Here we …

We propose a surrogate-based method for optimizing parameterized quantum circuits which
is designed to operate with few calls to a quantum computer. We employ a computationally …

We present a polynomial-time classical algorithm for estimating expectation values of
arbitrary observables on typical quantum circuits under any incoherent local noise, including …