Measurement-induced multipartite-entanglement regimes in collective spin systems
Poggi, Pablo M. and Muñoz-Arias, Manuel H. (2024) Measurement-induced multipartite-entanglement regimes in collective spin systems. Quantum, 8. 1229. ISSN 2521-327X (https://doi.org/10.48550/arXiv.2305.10209)
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Abstract
We study the competing effects of collective generalized measurements and interaction-induced scrambling in the dynamics of an ensemble of spin-1/2 particles at the level of quantum trajectories. This setup can be considered as analogous to the one leading to measurement-induced transitions in quantum circuits. We show that the interplay between collective unitary dynamics and measurements leads to three regimes of the average Quantum Fisher Information (QFI), which is a witness of multipartite entanglement, as a function of the monitoring strength. While both weak and strong measurements lead to extensive QFI density (i.e., individual quantum trajectories yield states displaying Heisenberg scaling), an intermediate regime of classical-like states emerges for all system sizes where the measurement effectively competes with the scrambling dynamics and precludes the development of quantum correlations, leading to sub-Heisenberg-limited states. We characterize these regimes and the transitions between them using numerical and analytical tools, and discuss the connections between our findings, entanglement phases in monitored many-body systems, and the quantum-to-classical transition.
ORCID iDs
Poggi, Pablo M. ORCID: https://orcid.org/0000-0002-9035-3090 and Muñoz-Arias, Manuel H.;-
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Item type: Article ID code: 87809 Dates: DateEvent12 January 2024Published27 December 2023AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 15 Jan 2024 12:39 Last modified: 15 Oct 2024 00:54 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/87809