2024-12-11 ノースウェスタン大学
A cloud of cold, trapped strontium atoms hovers inside the atom interferometer. Invented in 1991, atom interferometers take advantage of superposition, a fundamental principle in quantum mechanics that a particle can exist in multiple states simultaneously.
＜関連情報＞
- https://news.northwestern.edu/stories/2024/12/new-tool-will-help-probe-the-embarrassing-problem-of-dark-matter/
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.243403
共振原子干渉計における千倍位相増幅のためのマルチパス干渉による頑健な量子制御 Robust Quantum Control via Multipath Interference for Thousandfold Phase Amplification in a Resonant Atom Interferometer
Yiping Wang, Jonah Glick, Tejas Deshpande, Kenneth DeRose, Sharika Saraf, Natasha Sachdeva, Kefeng Jiang, Zilin Chen, and Tim Kovachy
Physical Review Letters Published: 11 December, 2024
DOI:https://doi.org/10.1103/PhysRevLett.133.243403
Abstract
We introduce a novel technique for enhancing the robustness of light-pulse atom interferometers against the pulse infidelities that typically limit their sensitivities. The technique uses quantum optimal control to favorably harness the multipath interference of the stray trajectories produced by imperfect atom-optics operations. We apply this method to a resonant atom interferometer and achieve thousandfold phase amplification, representing a 50-fold improvement over the performance observed without optimized control. Moreover, we find that spurious interference can arise from the interplay of spontaneous emission and many-pulse sequences and demonstrate optimization strategies to mitigate this effect. Given the ubiquity of spontaneous emission in quantum systems, these results may be valuable for improving the performance of a diverse array of quantum sensors. We anticipate our findings will significantly benefit the performance of matter-wave interferometers for a variety of applications, including dark matter, dark energy, and gravitational wave detection.
