Theoretical analysis uncovers a multipartite entanglement transition in monitored quantum Ising chains, revealing phase boundaries distinct from entanglement entropy.
Quantum systems subject to external monitoring manifest a rich phenomenology in their entanglement properties. Here, the authors use quantum Fisher information to uncover a multipartite entanglement phase transition in the monitored quantum Ising chain. By changing the measurement rate, they observe a shift from bounded to long-range multipartiteness of quantum correlations. They show that the quantum Fisher information displays distinct behavior from the entanglement entropy, and the two outline different phase boundaries.
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Paviglianiti et al. (2023) studied this question.
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