arXiv 2107.019022021-07-05quant-ph

利用拉姆齐干涉法实现微动最小化

Micromotion minimization using Ramsey interferometry

Gerard Higgins, Shalina Salim, Chi Zhang, Harry Parke, Fabian Pokorny, Markus Hennrich

备注：: Main text: 14 pages, 18 figures. Appendix: 5 pages, 4 figures
发表信息：: New J. Phys. 23 123028 (2021)
DOI：: 10.1088/1367-2630/ac3db6

摘要：

通过对囚禁离子光学量子比特施加干涉脉冲序列，我们快速准确地减小了线性Paul阱中的杂散电场。当阱刚度改变时，干涉序列对离子平衡位置的变化很敏感，我们利用这一点来确定杂散电场。最简单的脉冲序列是双脉冲Ramsey序列，具有多个脉冲的较长序列提供更高的精度。该方法允许杂散场强度被最小化，超出最先进的水平，只有适度的实验要求。使用九个脉冲的序列，我们在$11\,\mathrm{s}$测量时间内将2D杂散场强降低到$(10.5\pm0.8)\,\mathrm{mV\,m^{-1}}$。脉冲序列易于实现和自动化，并且它们对激光失谐和脉冲面积误差具有鲁棒性。我们使用不同长度和精度的干涉测量序列来测量杂散场，其不确定度低于标准量子极限。这标志着一个现实世界的情况下，量子精密测量提供了一个显着的增强。此外，我们最大限度地减少微动在2D使用单探针激光器，通过使用干涉测量方法连同解决边带方法，这是有用的实验与限制光学访问。此外，这项工作中提出的技术与同步时钟的量子协议有关;我们在这里演示这些协议。

英文摘要：

We minimize the stray electric field in a linear Paul trap quickly and accurately, by applying interferometry pulse sequences to a trapped ion optical qubit. The interferometry sequences are sensitive to the change of ion equilibrium position when the trap stiffness is changed, and we use this to determine the stray electric field. The simplest pulse sequence is a two-pulse Ramsey sequence, and longer sequences with multiple pulses offer a higher precision. The methods allow the stray field strength to be minimized beyond state-of-the-art levels, with only modest experimental requirements. Using a sequence of nine pulses we reduce the 2D stray field strength to $(10.5\pm0.8)\,\mathrm{mV\,m^{-1}}$ in $11\,\mathrm{s}$ measurement time. The pulse sequences are easy to implement and automate, and they are robust against laser detuning and pulse area errors. We use interferometry sequences with different lengths and precisions to measure the stray field with an uncertainty below the standard quantum limit. This marks a real-world case in which quantum metrology offers a significant enhancement. Also, we minimize micromotion in 2D using a single probe laser, by using an interferometry method together with the resolved sideband method; this is useful for experiments with restricted optical access. Furthermore, a technique presented in this work is related to quantum protocols for synchronising clocks; we demonstrate these protocols here.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文