论文标题
通过非铁晶格动力学的指数增强量子传感
Exponentially-enhanced quantum sensing with non-Hermitian lattice dynamics
论文作者
论文摘要
我们研究了如何利用非热晶格系统的独特特征，以在完全量子设置中改善哈密顿参数估计。虽然所谓的非铁皮皮肤效应没有任何明显的优势，但替代效果产生了巨大的增强。我们表明，具有$ \ mathbb {z} _2 $对称性的某些不对称的非热结合模型产生了明显的传感优势：每个光子的量子渔民信息随系统大小而呈指数增长。我们发现，这些优势持续存在于非马克维亚和非扰动效应变得重要的政权中。我们的设置与各种量子光学和超导电路平台直接兼容，并且已经产生了强大的增强功能，只有三个晶格位点。
We study how unique features of non-Hermitian lattice systems can be harnessed to improve Hamiltonian parameter estimation in a fully quantum setting. While the so-called non-Hermitian skin effect does not provide any distinct advantage, alternate effects yield dramatic enhancements. We show that certain asymmetric non-Hermitian tight-binding models with a $\mathbb{Z}_2$ symmetry yield a pronounced sensing advantage: the quantum Fisher information per photon increases exponentially with system size. We find that these advantages persist in regimes where non-Markovian and non-perturbative effects become important. Our setup is directly compatible with a variety of quantum optical and superconducting circuit platforms, and already yields strong enhancements with as few as three lattice sites.
