Fate of measurement-induced phase transition in long-range interactions

Abstract

We consider quantum many-body dynamics under quantum measurements, where the measurement-induced phase transitions (MIPs) occur when changing the frequency of the measurement. In this work, we consider the robustness of the MIP for long-range interaction that decays as $r^{-\alpha }$ with distance $r$. The effects of long-range interactions are classified into two regimes: (i) the MIP is observed $(\alpha >{\alpha }_c)$, and (ii) the MIP is absent even for arbitrarily strong measurements $(\alpha <{\alpha }_c)$. Using fermion models, we demonstrate both regimes in integrable and non-integrable cases. We identify the underlying mechanism and propose sufficient conditions to observe the MIP, that is, $\alpha >d/2+1$ for general bilinear systems and $\alpha >d+1$ for general non-integrable systems ($d$: spatial dimension). Numerical calculation indicates that these conditions are optimal.

7+6 pages, 9 figures

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