Journal
PRX QUANTUM
Volume 2, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PRXQuantum.2.010311
Keywords
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Funding
- UChicago MRSEC (NSF) [DMR-1420709]
- SHyNE, a node of the NSF's National Nanotechnology Coordinated Infrastructure [ECCS-1542205]
- AFOSR [FA9550-19-1-0358]
- DARPA [D18AC00015KK1932]
- ONR [N00014-17-1-3026]
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The study focuses on the quantum dynamics of optically addressable paramagnetic defects in wide-band-gap semiconductors, demonstrating that avoided crossings can substantially alter their quantum dynamics. Experimental results show that single defect quantum devices can operate at avoided crossings, paving the way for potential quantum information applications.
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.
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