Giuseppe D'Auria | Searcharxiv

arXiv2026

Nonequilibrium Spin-Glass Order in a Long-Range Quantum Ising Glass and Its Sensitivity to Noise

We study spin-glass order after a transverse-field quench in a long-range quantum Ising glass. The diagonal-ensemble Edwards-Anderson order coincides at the no-quench and zero-field endpoints, yet in between cold shells overshoot it and hot shells undershoot it. This stems from a competition in correlation space between the rigidity of populated eigenstates and the spread of their pair patterns. Under weak longitudinal dephasing the zero-field endpoint is exactly pinned while the characteristic finite-quench response fades, giving a self-referenced noise probe for quantum spin simulators.

cond-mat.dis-nn↗

arXiv2025

Decoherence Cancellation through Noise Interference

We propose a novel, feedback-free method to cancel the effects of decoherence in the dynamics of open quantum systems subject to dephasing. The protocol makes use of the coupling with an auxiliary system when they are both subject to the same noisy dynamics, in such a way that their interaction leads to cancellation of the noise on the system itself. This requires tuning the strength of the coupling between main and auxiliary systems as well as the ability to prepare the auxiliary system in a Fock state, which solely depends on the coupling strength. We investigate the protocol's efficiency to protect NOON states against dephasing in setups such as tweezers arrays of cold atoms. We show that the protocol's efficiency is robust against fluctuations of the optimal parameters and, remarkably, that it is independent of the temporal noise features. Therefore, it can be applied to cancel both Markovian and non-Markovian noise effects, in the regime where error-correction protocols become inefficient.

quant-ph↗