Probing the Coherence of Solid-State Qubits at Avoided Crossings

Mykyta Onizhuk, Kevin C. Miao, Joseph P. Blanton, He Ma, Christopher P. Anderson, Alexandre Bourassa, David D. Awschalom, Giulia Galli

Research output: Contribution to journalArticlepeer-review

Abstract

Optically addressable paramagnetic defects in wide-band-gap semiconductors are promising platforms for quantum communications and sensing. The presence of avoided crossings between the electronic levels of these defects can substantially alter their quantum dynamics and be both detrimental and beneficial for quantum information applications. Here we present a joint theoretical and experimental study of the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings. We find that we can condition the clock transition of the divacancies in SiC on multiple adjacent nuclear spins states. We suppress the effects of fluctuating charge impurities and demonstrate an increased coherence time at clock transition, which is limited purely by magnetic noise. Our results pave the way to designing single defect quantum devices operating at avoided crossings.

Original languageEnglish (US)
Article number010311
JournalPRX Quantum
Volume2
Issue number1
DOIs
StatePublished - Jan 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Computer Science
  • Applied Mathematics
  • Mathematical Physics
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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