Alberto BIELLA
Pitaevskii BEC Center, CNR-INO and University of Trento
Abstract
In this talk, I will discuss the onset of the quantum Zeno effect in many-body systems subject to local continuous measurements. The competition between the unitary dynamics, which tends to spread quantum information, and stochastic local measurements, that kill superpositions, induces a phase transition in the entanglement properties of the system. This transition is associated with a sharp localisation of quantum trajectories over the Zeno subspace of the model [1]. We show how this physics can be understood starting from the non-Hermitian Hamiltonian governing the no-click evolution. We will conclude the talk by discussing recent progress involving multi-site measurements [2] as well as measurement engineering aimed at the suppression of errors in quantum simulations [3].
[1] AB, Schiró, Quantum 5, 528 (2021).
[2] Zeni, Chakraborty, Romito, AB, arXiv:2503.22846 (2025).
[3] Wauters, Ballini, AB, Hauke, Phys. Rev. B 111, 094315 (2025).
