QUANTUM MATERIALS AND DEVICES SEMINARS: Quantum annealing: dissipative dynamics and shortcuts to adiabaticity

Adiabatic quantum computation allows solving hard optimization problems, adiabatically driving the ground state of a quantum spin system starting from a simple, and easy to prepare, ground state, towards the one of a complex interacting Hamiltonian, encoding the solution of the problem at hand.
Adiabaticity requires long-time dynamics that are not allowed in real life devices, affected by decoherence and dissipation. In this talk I will summarize our recent achievements to speed up quantum annealing with two different strategies. On the one hand, we can implement nonlinear annealing schedules, including pausing and reverse annealing, that may improve the performance of quantum annealing in the presence of a dissipative bath. On the other hand, we can also pursue shortcuts to adiabaticity,  based on the  suppression of diabatic transitions. Most of our results are obtained for the fully-connected ferromagnetic p-spin model, an analytically solvable model with a search-like behavior.

G Passarelli, V Cataudella, P Lucignano, Improving quantum annealing of the ferromagnetic p-spin model through pausing Physical Review B 100 (2), 024302 (2019)
G Passarelli, KW Yip, DA Lidar, H Nishimori, P Lucignano Reverse quantum annealing of the p-spin model with relaxation Physical Review A 101 (2), 022331 (2020)
G Passarelli, V Cataudella, R Fazio, P Lucignano, Counterdiabatic driving in the quantum annealing of the p-spin model: A variational approach Physical Review Research 2 (1), 013283 (2020)
PR Hegde, G Passarelli, A Scocco, P Lucignano, Genetic optimization of quantum annealing arXiv preprint arXiv:2108.03185
G Passarelli, R Fazio, P Lucignano, Transitionless quantum annealing in a dissipative environment arXiv preprint arXiv:2109.13043

Host: Miguel A. Cazalilla
ZOOM: https://dipc-org.zoom.us/meeting/register/tZAqceGqrzMqE9fPWdhzaKxoIscCspVlFJ4Y

Online Seminar, Donostia International Physics Center


Procolo Lucignano, Dipartimento di Fisica E. Pancini, Università di Napoli Federico II, Italy

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