论文标题
受希尔伯特空间碎片保护的量子计量
Quantum Metrology Protected by Hilbert Space Fragmentation
论文作者
论文摘要
我们提出了一种纠缠增强的感应方案，该方案可抵抗空间不均匀的始终在融合相互作用上。我们的策略是使用希尔伯特空间碎片化（HSF）量身定制相干量子动力学，这是一种最近公认的机制，可在动力学约束的多体系统中逃避热化。具体而言，我们在分析上表明，强烈的ISIND相互作用引起的紧急HSF使我们能够设计出稳定的状态，其中一部分旋转与系统的其余部分有效地分离。使用脱钩的旋转作为探针来测量横向场，我们证明了海森堡有限的灵敏度，而无需遭受热化。
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.
