Probing many-body dynamics in a two-dimensional dipolar spin ensemble

Davis, Emily Jane; Ye, Bingtian; Machado, Francisco; Meynell, Simon A.; Wu, W.; Mittiga, Thomas; Schenken, William; Joos, Maxime; Kobrin, Bryce; Lyu, Yuanqi; Wang, Z.; Bluvstein, Dolev; Choi, Soonwon; Zu, Chong; Jayich, Ania; Yao, Norman Y.

doi:10.1038/s41567-023-01944-5

Cited by 30 publications

(3 citation statements)

References 66 publications

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“…As anticipated, the factor for the enhancement of the T 2 time increases with decreasing defect concentration. 20 The stretched-exponential parameters are on average 1.45 in the three-dimensional and 0.99 in the quasi two-dimensional case, which is in good agreement with results from effective noise models based on the Ornstein-Uhlenbeck process, 22 which predict values of 1.5 in bulk systems and 1 in the two-dimensional case, respectively. 22 Table 1.…”

Section: Resultssupporting

confidence: 69%

“…20 The stretched-exponential parameters are on average 1.45 in the three-dimensional and 0.99 in the quasi two-dimensional case, which is in good agreement with results from effective noise models based on the Ornstein-Uhlenbeck process, 22 which predict values of 1.5 in bulk systems and 1 in the two-dimensional case, respectively. 22 Table 1. Coherence time and stretched exponential of the decay of the NV-electron spin in a spin bath of electron spins at different concentrations.…”

Section: Resultssupporting

confidence: 69%

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Effect of spatial dimensionality on the spin-coherence decay in strongly-coupled spin baths

Schätzle,

Hahn

2024

Quantum Computing, Communication, and Simulation IV

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For quantum-technology applications, spin defects in solids are promising candidates but they are limited by their spin-coherence time. Hence, understanding the processes governing the spin-coherence decay is essential. We numerically calculate the spin-coherence time T 2 of the NV − -centre electron spin in diamond layers of different thickness in presence of a strongly-coupled disordered electron-spin bath. We show that the spin-coherence time in two-dimensional spin baths is longer than in three-dimensional spin baths. Furthermore, we obtain the corresponding stretched-exponential parameter, which also depends on the spatial dimensionality. We use the partitioning-based cluster-correlation expansion (pCCE) method, which partitions the bath into local subsystems and applies the clustion-correlation expansion method to these subsystems instead of individual spins, thereby offering a b etter numerical a ccuracy, e specially i n two-dimensional geometries.

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Section: Resultssupporting

confidence: 69%

Section: Resultssupporting

confidence: 69%

Effect of spatial dimensionality on the spin-coherence decay in strongly-coupled spin baths

Schätzle,

Hahn

2024

Quantum Computing, Communication, and Simulation IV

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“…In parallel, there are attempts to use ensembles of solid-state quantum emitters to study collective effects [68,69]. Solid-state emitters have several advantages compared to atoms as they are fixed in space, they can be closely packed to high densities, their excitation and emission wavelength are flexible, and they can be easily integrated with nano-photonic structures.…”

Section: Methodsmentioning

confidence: 99%

Manipulating the dipolar interactions and cooperative effects in confined geometries

Alaeian,

Skljarow,

Scheel

et al. 2024

New J. Phys.

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To facilitate the transition of quantum effects from the controlled laboratory environment to practical real-world applications, there is a pressing need for scalable platforms. One promising strategy involves integrating thermal vapors with nanostructures designed to manipulate atomic interactions. In this tutorial, we aim to gain deeper insights into this by examining the behavior of thermal vapors thatare confined within nanocavities or waveguides and exposed to near-resonant light. We explore the interactions between atoms in confined dense thermal vapors. Our investigation reveals deviations from the predictions of continuous electrodynamics models, including density-dependent line shifts and broadening effects. In particular, our results demonstrate that by carefully controlling the saturation of single atoms and the interactions among multiple atoms using nanostructures, along with controlling the geometry of the atomic cloud, it becomes possible to manipulate the effective optical nonlinearity of the entire atomic ensemble. This capability renders the hybrid thermal atom-nanophotonic platform a distinctive and valuable one for manipulating the collective effect and achieving substantial optical nonlinearities.

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Coherent dynamics of strongly interacting electronic spin defects in hexagonal boron nitride

Gong

Gao

et al. 2023

Nat Commun

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Optically active spin defects in van der Waals materials are promising platforms for modern quantum technologies. Here we investigate the coherent dynamics of strongly interacting ensembles of negatively charged boron-vacancy ($${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − ) centers in hexagonal boron nitride (hBN) with varying defect density. By employing advanced dynamical decoupling sequences to selectively isolate different dephasing sources, we observe more than 5-fold improvement in the measured coherence times across all hBN samples. Crucially, we identify that the many-body interaction within the $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − ensemble plays a substantial role in the coherent dynamics, which is then used to directly estimate the concentration of $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − . We find that at high ion implantation dosage, only a small portion of the created boron vacancy defects are in the desired negatively charged state. Finally, we investigate the spin response of $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − to the local charged defects induced electric field signals, and estimate its ground state transverse electric field susceptibility. Our results provide new insights on the spin and charge properties of $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − , which are important for future use of defects in hBN as quantum sensors and simulators.

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Probing many-body dynamics in a two-dimensional dipolar spin ensemble

Cited by 30 publications

References 66 publications

Effect of spatial dimensionality on the spin-coherence decay in strongly-coupled spin baths

Effect of spatial dimensionality on the spin-coherence decay in strongly-coupled spin baths

Manipulating the dipolar interactions and cooperative effects in confined geometries

Coherent dynamics of strongly interacting electronic spin defects in hexagonal boron nitride

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