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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-9670
DTSTART:20260429T150000Z
DTEND:20260429T160000Z
DTSTAMP:20260428T040805Z
LAST-MODIFIED:20260427T183022Z
LOCATION:Chamberlin 5310
SUMMARY:Quantum nodes with group IV color centers in diamond: from opt
 ical antennas to axial-free spins\, Atomic Physics Seminar\, Zixi Li\,
  University of Chicago
DESCRIPTION:Atom-like defects in solids are promising building blocks 
 for quantum technologies\, combining the controllability of isolated q
 uantum systems with the versatility of a solid-state platform. Among t
 hese\, group-IV color centers in diamond are especially attractive bec
 ause their inversion symmetry supports excellent optical coherence\, w
 hile their electronic and spin properties remain highly tunable throug
 h the local solid-state environment. In this talk\, I will discuss two
  directions in which these defects can be harnessed as new kinds of qu
 antum sensors. First\, I will show that a resonantly driven germanium-
 vacancy center can function as an atomic optical antenna\, generating 
 a strongly enhanced local optical field that enables the sensing and c
 ontrol of nearby charge defects. Second\, I will describe ongoing work
  showing that large strain can reshape the spin-orbital structure of g
 roup-IV centers\, partially release the electron spin from its usual l
 ocking to the defect axis and allow its quantization axis to be modifi
 ed by an external magnetic field\, which provides a route to accessing
  and detecting a broader set of surrounding nuclear spins. Together\, 
 these results illustrate how group-IV color centers can be developed i
 nto novel quantum sensors in diamond from both optical and spin perspe
 ctives.<br>\n<br>\n
URL:https://www.physics.wisc.edu/events/?id=9670
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