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SUMMARY:Quantum Coherence of Diamond NV Centers Near Surfaces\, Interfaces
 \, and Dislocations - Jonah Nagura (Chicago)
DTSTART:20251023T130000Z
DTEND:20251023T141500Z
UID:TALK239260@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Nitrogen-vacancy (NV) centers in diamond are leading solid-sta
 te qubits and nanoscale sensors\, yet their spin coherence degrades in the
  presence of surfaces\, interfaces\, and extended defects. \nIn this talk\
 , I will discuss how these structural and electronic imperfections generat
 e magnetic\, electric\, and strain noise that degrade NV coherence and how
  such interactions can also be harnessed as quantum resources.\nUsing dens
 ity functional theory and cluster correlation expansion techniques\, we (i
 n collaboration with Giulia Galli) developed a framework that connects mea
 sured noise spectra to the dynamics of surface and bulk defects. We show t
 hat incorporating dissipative and hopping processes of surface dark spins 
 accurately captures surface-induced decoherence\, allowing us to pinpoint 
 individual decoherence channels and identify geometrically induced coheren
 ce sweet spots that enhance NV stability and coherence. Together\, these i
 nsights reveal the microscopic origins of decoherence at key boundaries an
 d provide design rules for NV-based quantum sensing\, spin-photon interfac
 es\, and scalable diamond quantum technologies.
LOCATION:Seminar Room 3\, RDC
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