Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 15: Quantum Computing Theory
QI 15.3: Talk
Wednesday, March 20, 2024, 10:15–10:30, HFT-FT 101
Quantum state preparation via engineered ancilla resetting — •Daniel Alcalde Puente1,2, Felix Motzoi1, Tommaso Calarco1,2,3, Giovanna Morigi4, and Matteo Rizzi1,2 — 1Forschungszentrum Julich - Institute of Quantum Control, Peter Grünberg Institut (PGI-8), Jülich, Germany — 2Institute for Theoretical Physics-University of Cologne, Köln, Germany — 3Dipartimento di Fisica e Astronomia - Universita di Bologna, Bologna, Italy — 4Theoretical Physics- Department of Physics- Saarland University, Saarbrucken, Germany
In this study, we investigate a quantum resetting protocol for preparing ground states of frustration-free Hamiltonians. The protocol uses a steering Hamiltonian for local coupling to ancillary degrees of freedom, which are periodically reset. For short reset times, the dynamics resemble a Lindbladian with the target state as its steady state. We use Matrix Product State simulations and quantum trajectory methods to assess the protocol's efficiency in preparing the spin-1 Affleck-Kennedy-Lieb-Tasaki state, focusing on convergence time, fidelity, and energy evolution at various reset intervals. Our findings indicate that entanglement with the ancillary system is crucial for rapid convergence, with an optimal reset time for peak performance. The protocol also demonstrates robustness against small deviations in reset time and dephasing noise. Our results suggest that quantum resetting could be more advantageous than other methods like quantum reservoir engineering in certain contexts.
Keywords: State preparation; Quantum Measurements