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Q: Fachverband Quantenoptik und Photonik

Q 62: Ultra-cold Atoms, Ions and BEC IV (joint session A/Q)

Q 62.4: Talk

Thursday, March 5, 2026, 15:15–15:30, N 1

Discovery of atomic Shapiro steps — •Vijay Singh¹, E. Bernhart², M. Röhrle², H. Ott², G. Del Pace³, D. Hernandez-Rajkov³, N. Grani³, M. Frometa Fernandez³, G. Nesti³, J. A. Seman⁴, M. Inguscio³, G. Roati³, L. Mathey⁵, and L. Amico¹ — ¹QRC,TII,AbuDhabi, UAE — ²RPTU Kaiserslautern, Germany — ³LENS, University of Florence, Italy — ⁴UNAM Mexico — ⁵ZOQ and IQP, Universität Hamburg, Germany

I will discuss how Josephson effects arise in ultracold quantum systems and present recent theoretical predictions for driven atomic Josephson junctions [1]. Following this proposal, two leading experimental groups worldwide have independently observed Shapiro steps in atomic junctions for the first time [2, 3]. These experiments demonstrate deterministic, phase-locked transport in atomic circuits. Together, these advances establish driven atomic Josephson junctions as a versatile platform for atomtronics, quantum simulation, and quantum technology development.

[1] Singh, Polo, Mathey, Amico, PRL 133, 093401 (2024)

[2] Del Pace, Hernandez-Rajkov, Singh, Grani, Fernandez, Nesti, Seman, Inguscio, Amico, Roati, arXiv: 2409.03448 (2024)

[3] Bernhart, Röhrle, Singh, Mathey, Amico, Ott, arXiv: 2409.03340 (2024)

Keywords: Ultracold quantum gases; Josephson junctions; Shapiro steos; Phase synchronization; Atomtronics