Quantum Metrology Protected by Hilbert Space Fragmentation

• URL: http://arxiv.org/abs/2211.09567v1
• Date: Thu, 17 Nov 2022 14:51:22 GMT
• Title: Quantum Metrology Protected by Hilbert Space Fragmentation
• Authors: Atsuki Yoshinaga, Yuichiro Matsuzaki, Ryusuke Hamazaki
• Abstract summary: coherent quantum dynamics employing the Hilbert-space fragmentation (HSF) We 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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