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SUMMARY:Philip Willke (KIT) - Quantum Science with Single Atoms and Molecu
 les on Surfaces
DTSTART:20260424T134500Z
DTEND:20260424T151500Z
DTSTAMP:20260420T234200Z
UID:indico-event-17687@indico.global
DESCRIPTION:The quantum nature of a physical system often emerges from its
  fundamental building blocks and demands a deep understanding to leverage 
 its benefits for future quantum technologies. In this talk\, I introduce h
 ow spin systems on surfaces can act as a new platform for coherent quantum
  control. In particular\, I show how the combination of electron spin reso
 nance (ESR) with scanning tunneling microscopy (STM) enables the detection
 \, control\, and manipulation of individual spin centers with atomic spati
 al resolution and extremely high energy sensitivity. Building on the first
  demonstrations of ESR on single atoms on surfaces [1]\, I will introduce 
 the basic principles of this technique and show how it allows quantum syst
 ems to be investigated one atom at a time. As examples\, I discuss high-re
 solution magnetic sensing that resolves magnetic dipole interactions as we
 ll as hyperfine coupling between single electron and nuclear spins [2\,3].
  Beyond sensing\, these spin systems can be coherently driven and engineer
 ed as prototype quantum bits.\nI will highlight current research direction
 s in the field and in my group\, including the extension of coherent contr
 ol from single atoms to individual molecules[4\,5] as well as spin defects
  on surfaces. Finally\, I will discuss recent developments that connect th
 is platform to new experimental techniques\, such as atomic force microsco
 py\, and to new material systems\, including superconductors.\n[1] S. Baum
 ann et al.\, Electron paramagnetic resonance of individual atoms on a surf
 ace\, Science 350\, 417–420 (2015).[2] P. Willke et al.\, Magnetic reson
 ance imaging of single atoms on a surface\, Nature Physics 15\, 1005–101
 0 (2019).[3] P. Willke et al.\, Hyperfine interaction of individual atoms 
 on a surface\, Science 362\, 336–339 (2018).[4] X. Zhang et al.\, Electr
 on spin resonance of single iron phthalocyanine molecules and role of thei
 r non-localized spins in magnetic interactions\, Nature Chemistry 14\, 59
 –65 (2022).[5] W. Huang et al.\, Quantum spin-engineering in on-surface 
 molecular ferrimagnets\, Nature Communications 16\, 5208 (2025).\n\nhttps:
 //indico.global/event/17687/
URL:https://indico.global/event/17687/
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