论文标题
在偶极相互作用的自旋系统中制备计量状态
Preparation of Metrological States in Dipolar-Interacting Spin Systems
论文作者
论文摘要
自旋系统是量子增强计量学的有吸引力的候选者。在这里，我们开发了一种变异方法，以有限的量子控制和未知的自旋位置在小的双极相互作用集合中产生计量状态。生成的状态使得超过标准量子极限（SQL）并接近海森堡极限（HL）。根据电路深度和读数噪声的水平，结果状态类似于Greenberger-Horne-Zeilinger（GHz）状态或自旋挤压状态（SSS）。在存在有限的自旋极化和非马克维亚噪声环境的情况下，SQL超越SQL的感应。
Spin systems are an attractive candidate for quantum-enhanced metrology. Here we develop a variational method to generate metrological states in small dipolar-interacting ensembles with limited qubit controls and unknown spin locations. The generated states enable sensing beyond the standard quantum limit (SQL) and approaching the Heisenberg limit (HL). Depending on the circuit depth and the level of readout noise, the resulting states resemble Greenberger-Horne-Zeilinger (GHZ) states or Spin Squeezed States (SSS). Sensing beyond the SQL holds in the presence of finite spin polarization and a non-Markovian noise environment.
