Update index.md

Author: hhaeffner

publications/index.md

@@ -10,6 +10,10 @@ Jump to:
 [Masters Theses](#masters-theses)
 
 ## Journal Papers
+**"Engineered Randomness for Ubiquitous Quantum-Enhanced Metrology in Exponential-Dimensional Manifolds"**<br>
+Yaoming Chu, Baiyi Yu, Hartmut Häffner, Markus Heyl, Nathan Goldman, Jianming Cai<br>
+[arXiv:2605.31442](https://https://arxiv.org/abs/2605.31442).
+
 **"Design and fabrication of a micro-ion trap with a 3D-printed loading zone for improved hot-ion capture"**<br>
 Sayan Patra, Abhinav Parakh, Xiaoxing Xia, Juergen Biener, Hartmut Häffner, Kristin M. Beck<br>
 [arXiv:2605.08502](https://arxiv.org/abs/2605.08502).