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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-7967
DTSTART:20221208T160000Z
DTEND:20221209T000000Z
DTSTAMP:20260414T123654Z
LAST-MODIFIED:20230109T160642Z
LOCATION:5310 Chamberlin
SUMMARY:Spin-phonon effects in nitrogen-vacancy centers\, R. G. Herb C
 ondensed Matter Seminar\, Matt Cambria \, UW-Madison
DESCRIPTION:Spin-phonon interactions provide solid-state qubits with b
 oth a unique obstacle to long coherence times\, as well as a useful pr
 operty to exploit for quantum sensing. In this talk\, we discuss our r
 ecent efforts to understand spin-phonon interactions in the nitrogen-v
 acancy (NV) center in diamond. In particular\, we present measurements
  of phonon-limited relaxation rates within the NV center's electronic 
 ground state spin triplet manifold. Informed by ab initio work\, we de
 termine that NV spin-phonon relaxation is dominated by interactions wi
 th phonons whose energies are centered at two characteristic frequenci
 es. We adapt this observation into a semi-empirical model that provide
 s excellent agreement with the experimental data. We discuss how a sim
 ilar model can describe the NV center's zero field splitting\, a quant
 ity fundamental to NV-based thermometry schemes. Finally\, we identify
  an NV qubit subspace that is immune to spin-phonon dephasing\, and we
  predict that such a qubit could exhibit record NV electronic spin coh
 erence times.
URL:https://www.physics.wisc.edu/events/?id=7967
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