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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-8308
DTSTART:20230629T150000Z
DTEND:20230629T230000Z
DTSTAMP:20260414T033134Z
LAST-MODIFIED:20230628T165404Z
LOCATION:5310 Chamberlin
SUMMARY:Interactions Between Nitrogen-Based Spin Defects in Diamond\, 
 R. G. Herb Condensed Matter Seminar\, Jonathan Marcks\, Argonne Nation
 al Laboratory
DESCRIPTION:Defect center-based spin qubits in solid-state materials s
 how great promise as quantum sensors and nodes in quantum networks. Th
 e success of these applications relies on precise control and understa
 nding of the qubit host material and noise environment\, which ultimat
 ely dictate qubit coherence. In this talk\, I will describe our recent
  efforts to better understand environment-induced decoherence of the n
 itrogen vacancy (NV) center in diamond\, an optically addressable spin
  qubit with coherent properties up to and above room temperature. I wi
 ll focus on NV centers in nuclear spin-free diamond surrounded by low-
 dimensional dark electron spin baths\, growth conditions achievable vi
 a in-house chemical vapor deposition (CVD) diamond growth. Introductio
 n of unconverted nitrogen defects (P1 centers) is unavoidable in CVD g
 rowth and NV center synthesis\, and it is thus critical to study NV-P1
  interactions at scales relevant for quantum devices. To this end\, I 
 will first discuss quantitative computational studies of NV decoherenc
 e at the length and density scales relevant for synthesizing single NV
  centers\, providing a reference for future NV synthesis\, as well as 
 revealing coherence behavior dependent on the spin bath dimensionality
 . These data are then applied to characterize nitrogen density in-situ
  via a statistical model\, bypassing the need for unreliable bulk char
 acterization techniques. I will then present measurements of spin bath
  dynamics at the single-spin level as a means to understand how micros
 copic processes cause decoherence. I will describe a polarization- and
  time-resolved measurement technique of a strongly coupled NV-P1 syste
 m that enables a probe of P1 polarization decay under arbitrary microw
 ave and optical drives. These measurements reveal decay mechanisms on 
 the single-spin level\, allowing us to address open questions about th
 e behavior of P1 spin baths in diamond. 
URL:https://www.physics.wisc.edu/events/?id=8308
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