论文标题
光学晶格时钟通过多波段采样精确对角线化方法的密度转移
Density Shift of Optical Lattice Clock via Multi-Bands Sampling Exact Diagonalization Method
论文作者
论文摘要
密度转移在光学晶格时钟的不确定性中起主要作用之一，因此吸引了许多理论和实验研究。但是，大多数理论研究都考虑了单频段和集体近似，因此无法准确分析系统在较高温度下的密度转移。在这里，我们设计了一种数字算法，该算法结合了蒙特卡洛采样和精确的对角线化，并将其命名为多带抽样精确的对角线化（MBSED）。 MBSED方法考虑了多带之间的原子的碰撞，因此它可以以更高的精度提供光学晶格时钟的密度偏移。这种算法将有益于光学晶格时钟的数值模拟，并且也可以用于其他量子计量平台中。另外，通过我们的数值模拟，我们还发现，狂犬病谱的密度移位略有非线性，具有原子数。
Density shift plays one of the major roles in the uncertainty of optical lattice clock, thus has attracted lots of theoretical and experimental studies. However, most of the theoretical research considered the single-band and collective approximation, so the density shift of the system at higher temperatures can not be analyzed accurately. Here, we design a numerical algorithm that combines Monte Carlo sampling and exact diagonalization and name it as Multi-Band Sampling Exact Diagonalization (MBSED). The MBSED method considers the collision of atoms between multi-bands, so it can provide the density shift of an optical lattice clock with higher precision. Such an algorithm will benefit the numerical simulation of an optical lattice clock, and may also be used in other platforms of quantum metrology. In addition, through our numerical simulation, we also found that the density shift of Rabi spectrum is slightly non-linear with atom number.
