Turning qubit noise into a blessing: Automatic state preparation and long-time dynamics for impurity models on quantum computers - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2024

Turning qubit noise into a blessing: Automatic state preparation and long-time dynamics for impurity models on quantum computers

Résumé

Noise is often regarded as a limitation of quantum computers. In this work, we show that in the dynamical mean field theory (DMFT) approach to strongly-correlated systems, it can actually be harnessed to our advantage. Indeed, DMFT maps a lattice model onto an impurity model, namely a finite system coupled to a dissipative bath. While standard approaches require a large number of high-quality qubits in a unitary context, we propose a circuit that harvests amplitude damping to reproduce the dynamics of this model with a blend of noisy and noiseless qubits. We find compelling advantages with this approach: a substantial reduction in the number of qubits, the ability to reach longer time dynamics, and no need for ground state search and preparation. This method would naturally fit in a partial quantum error correction framework.

Dates et versions

hal-04847678 , version 1 (19-12-2024)

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Corentin Bertrand, Pauline Besserve, Michel Ferrero, Thomas Ayral. Turning qubit noise into a blessing: Automatic state preparation and long-time dynamics for impurity models on quantum computers. 2024. ⟨hal-04847678⟩

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