Quantum Metrology Protected by Hilbert Space Fragmentation
Abstract
We propose an entanglement-enhanced sensing scheme that is robust against spatially inhomogeneous always-on Ising interactions. Our strategy is to tailor coherent quantum dynamics employing the Hilbert-space fragmentation (HSF), a recently recognized mechanism that evades thermalization in kinetically constrained many-body systems. Specifically, we analytically show that the emergent HSF caused by strong Ising interactions enables us to design a stable state where part of the spins is effectively decoupled from the rest of the system. Using the decoupled spins as a probe to measure a transverse field, we demonstrate that the Heisenberg limited sensitivity is achieved without suffering from thermalization.
Cite
@article{arxiv.2211.09567,
title = {Quantum Metrology Protected by Hilbert Space Fragmentation},
author = {Atsuki Yoshinaga and Yuichiro Matsuzaki and Ryusuke Hamazaki},
journal= {arXiv preprint arXiv:2211.09567},
year = {2022}
}
Comments
6 pages, 2 figures (main), 6 pages, 2 figures (supplement)