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SUMMARY:Helium Spin Echo – An Open Quantum System - Matthew Ord\, Cavend
 ish Laboratory\, University of Cambridge
DTSTART:20250812T130000Z
DTEND:20250812T140000Z
UID:TALK235078@talks.cam.ac.uk
CONTACT:Boyao Liu
DESCRIPTION:The Helium Spin Echo (HeSE) experiment offers a compelling exa
 mple of an open quantum system\, where interactions between a quantum part
 icle and its environment are essential to understanding observed behaviour
 . In this talk\, we use the HeSE setup to introduce the key concepts and t
 erminology of open quantum systems\, contrasting them with the conventiona
 l semiclassical interpretation. We then apply this framework to the dynami
 cs of hydrogen adsorbates on surfaces during spin echo measurements. Using
  the Caldeira–Leggett model\, we examine what can meaningfully be said a
 bout the quantum state of an adsorbed atom before\, during\, and after a s
 cattering event.
LOCATION:Seminar Room North\, Ray Dolby Centre\, Cavendish Laboratory
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