SAMOP 2023 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 6: Poster I (joint session QI/Q)

QI 6.44: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Measurement Induced State Preparation — •Daniel Alcalde Puente — PGI8, Wilhelm-Johnen-Straße 52428 Jülich

This work explores the protocol proposed in (Roy, Sthitadhi, et al. "Measurement-induced steering of quantum systems." Physical Review Research 2.3 (2020): 033347) for state preparation outside of the Lindblad limit. In this protocol, a system is coupled to ancillas with a time-independent Hamiltonian, with the ancillas being periodically reset. The protocol exploits the frustration-free nature of the parent Hamiltonian, enabling the writing of local operators that map from locally excited states to locally unexcited states. The full dynamics of this protocol are simulated using Matrix Product States and quantum trajectories, and the behavior of the protocol is analyzed for different measurement intervals. In particular, our study explores the case of preparing the spin-1 Affleck-Kennedy-Lieb-Tasaki state and discusses the protocol's resilience to errors. The results show that the dynamics of the protocol match the dynamics of the Lindblad limit for relatively large measurement intervals, that the optimal measurement interval is close to the expected ideal measurement interval, and that the protocol converges even for large measurement intervals, though only slowly.