Ewan McCulloch

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quant-ph2026

KPZ Superdiffusion of Local Correlators in Diffusive Random Quantum Circuits

Ewan McCulloch

We study the single-particle Green's function $G (x, t) = ⟨ σ_{x}^{-} (0) σ_{0}^{+} (t)⟩$ in one-dimensional particle-number-conserving random unitary circuits coupled to an external…

quant-ph2026

Long-lived local quantum coherences from hydrodynamic large deviations

Ewan McCulloch, J. Alexander Jacoby, Sarang Gopalakrishnan

We develop a framework to describe how quantum coherences between distinct charge sectors evolve under generic charge-conserving dynamics. Our framework captures the nonperturbativ…

quant-ph2025

Subexponential decay of local correlations from diffusion-limited dephasing

Ewan McCulloch, J. Alexander Jacoby, Curt von Keyserlingk +1

Chaotic quantum systems at finite energy density are expected to act as their own heat baths, rapidly dephasing local quantum superpositions. We argue that in fact this dephasing i…