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Entanglement in a fermion chain under continuous monitoring

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arxiv 1804.04638 v5 pith:LKP7UNUJ submitted 2018-04-12 cond-mat.stat-mech cond-mat.quant-gasquant-ph

classification cond-mat.stat-mechcond-mat.quant-gasquant-ph
keywords entanglementchaincontinuousentropyfermionmonitoringtheoryunder
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We study the entanglement entropy of the quantum trajectories of a free fermion chain under continuous monitoring of local occupation numbers. We propose a simple theory for entanglement entropy evolution from disentangled and highly excited initial states. It is based on generalized hydrodynamics and the quasi-particle pair approach to entanglement in integrable systems. We test several quantitative predictions of the theory against extensive numerics and find good agreement. In particular, the volume law entanglement is destroyed by the presence of arbitrarily weak measurement.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Theory of the phase transition in random unitary circuits with measurements

    cond-mat.stat-mech 2019-08 conditional novelty 8.0 of 10

    A replica calculation maps random unitary circuits with measurements to classical spin models, yielding a percolation transition with p_c=1/2 at infinite local dimension and a new Fisher-information signature.

  2. Unraveling superradiance: Entanglement and mutual information in collective decay

    quant-ph 2025-05 conditional novelty 7.0 of 10

    Collective superradiant emission from squeezed reservoirs and waveguides can be accurately described by averages over product states, yielding exact large-N scaling predictions for the emission burst.

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