Geometric optimality of entanglement-induced fast qubit reset

Abstract:Fast and reliable qubit reset is essential for the efficient operation of quantum processors. Among the proposed strategies, Mpemba-effect-based protocols offer a simple route to accelerated relaxation, but provide limited insight into the optimality of the full reset dynamics. Geometric approaches, by contrast, quantify optimality but do not generally suggest practical acceleration protocols. Here, we bridge these perspectives through a geometric analysis of entanglement-assisted qubit reset. We show that entangling operations can redistribute local coherences across a multi-qubit register, allowing the reduced state of each qubit to follow a geodesic path towards the ground state. Remarkably, this locally optimal behaviour can emerge even when the collective evolution becomes suboptimal in the full state space. We illustrate this interplay for different families of initial multi-qubit states. Our results provide a geometric perspective on Mpemba-inspired reset acceleration and clarify when extending two-qubit protocols to larger registers provides a further advantage in the reset process.

17 pages, 5 figures (main text and bibliography: 11 pages, 4 figures; appendices: 6 pages, 1 figure). Comments are welcome!

Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech)

arXiv:2608.26897 [quant-ph]

(or arXiv:2608.26897v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2608.26897 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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