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

• URL: http://arxiv.org/abs/2412.13711v1
• Date: Wed, 18 Dec 2024 10:52:33 GMT
• Title: Turning qubit noise into a blessing: Automatic state preparation and long-time dynamics for impurity models on quantum computers
• Authors: Corentin Bertrand, Pauline Besserve, Michel Ferrero, Thomas Ayral,
• Abstract summary: We show that in the dynamical mean field theory approach to strongly-correlated systems, noise can be harnessed to our advantage.<n>We propose a circuit that harvests amplitude damping to reproduce the dynamics of this model with a blend of noisy and noiseless qubits.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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