具有横向磁场的伊辛哈密顿量的量子计量学
量子物理
2015-08-26 v3
摘要
我们考虑由参数依赖哈密顿量生成的酉演化的量子计量学。我们聚焦于由伊辛哈密顿量生成的酉演化,该哈密顿量描述了一维自旋链在最近邻相互作用以及全局横向磁场存在下的动力学。我们解析地求解了该问题,并表明在已知相互作用强度(磁场)时估计磁场(相互作用强度)的精度服从海森堡极限标度,且可通过真空与 N 个自由费米子态的线性叠加实现。此外,我们表明 GHZ 型态在整个参数区间内均展现海森堡精度标度。而且,我们通过数值观察到使用乘积输入态的最优精度服从标准量子极限标度。
引用
@article{arxiv.1502.06459,
title = {Quantum metrology for the Ising Hamiltonian with transverse magnetic field},
author = {M. Skotiniotis and P. Sekatski and W. Dür},
journal= {arXiv preprint arXiv:1502.06459},
year = {2015}
}
备注
9 pages, 3 figures. Comments are most welcomed. In version 2 we have replaced Section 4 with the analytical results for estimating parameters using GHZ-type states. References have been updated and there is also a discussion concerning the duality of the one-dimensional Ising model. Version 3 is the published version