Search Results for author: Enrico Fontana

Found 3 papers, 0 papers with code

Non-trivial symmetries in quantum landscapes and their resilience to quantum noise

no code implementations17 Nov 2020 Enrico Fontana, M. Cerezo, Andrew Arrasmith, Ivan Rungger, Patrick J. Coles

(2) We study the resilience of the symmetries under noise, and show that while it is conserved under unital noise, non-unital channels can break these symmetries and lift the degeneracy of minima, leading to multiple new local minima.

Noise-Induced Barren Plateaus in Variational Quantum Algorithms

no code implementations28 Jul 2020 Samson Wang, Enrico Fontana, M. Cerezo, Kunal Sharma, Akira Sone, Lukasz Cincio, Patrick J. Coles

Specifically, for the local Pauli noise considered, we prove that the gradient vanishes exponentially in the number of qubits $n$ if the depth of the ansatz grows linearly with $n$.

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