4 papers · 1 filter
Dynamical regimes of QAOA gradient response
Zarin Shakibaei, Alexander Schnell
Characterizing the trainability of the Quantum Approximate Optimization Algorithm (QAOA) requires understanding how its gradient landscape changes across circuit parameters and pro…
Quantum tunneling and anti-tunneling across entropic barriers
Paolo Malgaretti, Francesco Petiziol, Alexander Schnell
We study the dynamics of a quantum particle in a constricted two-dimensional channel and analyze how the onset of quantum corrections impacts the (semi-)classical high-temperature…
Effective (Floquet) Lindblad generators from spectral unwinding
Görkem D. Dinc, André Eckardt, Alexander Schnell
A mathematical description of the reduced dynamics of an open quantum system can often be given in terms of a completely positive and trace preserving (CPTP) map, also known as qua…
Global becomes local: Efficient many-body dynamics for global master equations
Alexander Schnell
This work makes progress on the issue of global vs. local master equations. Global master equations like the Redfield master equation (following from standard Born and Markov appro…