Quantum 2025 – wissenschaftliches Programm
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FRI: Friday Contributed Sessions
FRI 1: Quantum Information: Concepts and Methods II
FRI 1.7: Vortrag
Freitag, 12. September 2025, 12:15–12:30, ZHG001
Turning qubit noise into a blessing: automatic state preparation and long-time dynamics for impurity models on quantum computers — •Corentin Bertrand1, Pauline Besserve1,2,3, Michel Ferrero2,3, and Thomas Ayral1 — 1Eviden Quantum Lab, 78340 Les Clayes-sous-Bois, France — 2Collège de France, Université PSL, 11 place Marcelin Berthelot, 75005 Paris, France — 3CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France
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.
Keywords: Dynamical Mean Field Theory; Noisy quantum computer; Quantum open system; Strongly correlated materials