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Growth of entanglement entropy under local projective measurements

Abstract : Non-equilibrium dynamics of many-body quantum systems under the effect of measurement protocols is attracting an increasing amount of attention. It has been recently revealed that measurements may induce an abrupt change in the scaling-law of the bipartite entanglement entropy, thus suggesting the existence of different non-equilibrium regimes. However, our understanding of how these regimes appear and whether they survive in the thermodynamic limit is much less established. Here we investigate these questions on a one-dimensional quadratic fermionic model: this allows us to reach system sizes relevant in the thermodynamic sense. We show that local projective measurements induce a qualitative modification of the time-growth of the entanglement entropy which changes from linear to logarithmic. However, in the stationary regime, the logarithmic behavior of the entanglement entropy does not survive in the thermodynamic limit and, for any finite value of the measurement rate, we numerically show the existence of a single area-law phase for the entanglement entropy. Finally, exploiting the quasi-particle picture, we further support our results by analysing the fluctuations of the stationary entanglement entropy and its scaling behavior.
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https://hal.univ-lorraine.fr/hal-03604289
Contributor : Dragi Karevski Connect in order to contact the contributor
Submitted on : Thursday, March 10, 2022 - 12:40:48 PM
Last modification on : Saturday, March 12, 2022 - 3:32:56 AM

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Michele Coppola, Emanuele Tirrito, Dragi Karevski, Mario Collura. Growth of entanglement entropy under local projective measurements. Physical Review B, American Physical Society, 2022, 105 (9), pp.094303. ⟨10.1103/PhysRevB.105.094303⟩. ⟨hal-03604289⟩

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