期刊
NPJ QUANTUM INFORMATION
卷 8, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41534-022-00632-1
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资金
- Fundacion Ramon Areces postdoctoral fellowship
- European Union [766402, 820394]
- Bosch-Forschungsstiftung
- Clore Scholars Programme
- Clore Israel Foundation
- ERC Synergy grant HyperQ [856432]
- BMBF
- VW Stiftung
- ERC grant QRES [770929, 667192]
- ISF
- Schwartzmann university chair
- European Research Council (ERC) [770929] Funding Source: European Research Council (ERC)
Diffusion noise is the main cause of spectral line broadening in liquid-state nano-scale nuclear magnetic resonance with shallow nitrogen-vacancy centers, resulting in limited resolution. However, a more accurate analysis of diffusion reveals that correlations persist for a longer time at the nano-scale, allowing for improved resolution and challenging our understanding of diffusion. Through experiments using different setups and measurement techniques, we provide overwhelming evidence of power-law decay of correlations, leading to sharp-peaked spectral lines where diffusion broadening is no longer a limitation to resolution.
Diffusion noise is a major source of spectral line broadening in liquid state nano-scale nuclear magnetic resonance with shallow nitrogen-vacancy centres, whose main consequence is a limited spectral resolution. This limitation arises by virtue of the widely accepted assumption that nuclear spin signal correlations decay exponentially in nano-NMR. However, a more accurate analysis of diffusion shows that correlations survive for a longer time due to a power-law scaling, yielding the possibility for improved resolution and altering our understanding of diffusion at the nano-scale. Nevertheless, such behaviour remains to be demonstrated in experiments. Using three different experimental setups and disparate measurement techniques, we present overwhelming evidence of power-law decay of correlations. These result in sharp-peaked spectral lines, for which diffusion broadening need not be a limitation to resolution.
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