Nuclear spin noise tomography in three dimensions with iterative simultaneous algebraic reconstruction technique (SART) processing

Ginthör, Stephan J.; Schlagnitweit, Judith; Bechmann, Matthias; Müller, Norbert

doi:10.5194/mr-1-165-2020

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Heteronuclear NMR spin noise signals have been observed only for 13 C [29]. NMR RASER and spin noise methods have also been extended to MRI methods [49][50][51] for 1 H. Similar MRI methods for the heteronuclei will be possible under experimental conditions in higher values of RD constants.…”

Section: Discussionmentioning

confidence: 99%

Estimation of Radiation Damping Rates Using 133Cs, 7Li and 31P Solution NMR Spectroscopy and a Theoretical NMR RASER Model

Chikayama,

Ginthör,

Bechmann

et al. 2023

Magnetochemistry

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Radio amplification using stimulated emission of radiation (RASER) effects in the NMR can increase NMR signals over time due to a feedback loop between the sample magnetization and the probe coil coupled with radiation damping (RD). Previously, RD rates had been directly observed only for the 1H, 3He, 17O and 129Xe nuclei. We report that experimental direct measurements of an NMR RASER to determine RD time constants for the three heteronuclei (133Cs (I = 7/2), 7Li (I = 3/2) and 31P (I = 1/2)) in a highly concentrated solution from the NMR RASER emissions using a conventional NMR probe. Under conditions where the RD rate exceeds the transverse relaxation rate (i.e., the NMR RASER condition is fulfilled), we recorded both the transverse NMR RASER response to imperfect inversion and the recovery of longitudinal magnetization. The data were directly evaluated based on the well-known Bloom model as estimated RD rate constants of 8.0, 1.8 and 25 Hz for 133Cs, 7Li and 31P, respectively. The proposed method can be applied to observe RD rate constants for the other nuclei as well.

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Section: Discussionmentioning

confidence: 99%

Estimation of Radiation Damping Rates Using 133Cs, 7Li and 31P Solution NMR Spectroscopy and a Theoretical NMR RASER Model

Chikayama,

Ginthör,

Bechmann

et al. 2023

Magnetochemistry

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“…This improved understanding together with technological advances allowed for experiments optimized for the detection of spin noise, such as at the spin-noise tuning optimum [68,69]. Applications include detection of low 13 C spin concentrations [70], monitoring of hyperpolarization without destroying the magnetization [71], and imaging [72,73]. These can be considered to be part of a much wider field of spin-noise spectroscopy, of which magneto-optical-rotation spectroscopy is one widely employed technique [74,75].…”

Section: Observations Of Spin-projection Noise and Its Applicationsmentioning

confidence: 99%

Quantum sensitivity limits of nuclear magnetic resonance experiments searching for new fundamental physics

Aybas

Bekker

Blanchard

et al. 2021

Quantum Sci. Technol.

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Nuclear magnetic resonance is a promising experimental approach to search for ultra-light axion-like dark matter. Searches such as the cosmic axion spin-precession experiments (CASPEr) are ultimately limited by quantum-mechanical noise sources, in particular, spin-projection noise. We discuss how such fundamental limits can potentially be reached. We consider a circuit model of a magnetic resonance experiment and quantify three noise sources: spin-projection noise, thermal noise, and amplifier noise. Calculation of the total noise spectrum takes into account the modification of the circuit impedance by the presence of nuclear spins, as well as the circuit back-action on the spin ensemble. Suppression of the circuit back-action is especially important in order for the spin-projection noise limits of searches for axion-like dark matter to reach the quantum chromodynamic axion sensitivity.

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Tomographic entanglement indicators from NMR experiments

Sharmila

Krithika

Pal

et al. 2022

The Journal of Chemical Physics

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In recent years, the performance of different entanglement indicators obtained directly from tomograms has been assessed in continuous-variable and hybrid quantum systems. In this paper, we carry out this task in the case of spin systems. We compute the entanglement indicators from actual experimental data obtained from three liquid-state NMR experiments, and compare them with standard entanglement measures calculated from the corresponding density matrices, both experimentally reconstructed and numerically computed. The gross features of entanglement dynamics and spin squeezing properties are found to be reproduced by these entanglement indicators. However, the extent to which these indicators and spin squeezing track the entanglement during time evolution of the multipartite systems in the NMR experiments is very sensitive to the precise nature and strength of interactions as well as the manner in which the full system is partitioned into subsystems. We also use the IBM quantum computer to implement equivalent circuits that capture the dynamics of the multipartite system in one of the NMR experiments and carry out a similar comparative assessment of the performance of tomographic indicators. This exercise shows that these indicators can estimate the degree of entanglement without necessitating detailed state reconstruction procedures, establishing the advantage of the tomographic approach.

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Nuclear spin noise tomography in three dimensions with iterative simultaneous algebraic reconstruction technique (SART) processing

Cited by 3 publications

References 28 publications

Estimation of Radiation Damping Rates Using 133Cs, 7Li and 31P Solution NMR Spectroscopy and a Theoretical NMR RASER Model

Estimation of Radiation Damping Rates Using 133Cs, 7Li and 31P Solution NMR Spectroscopy and a Theoretical NMR RASER Model

Quantum sensitivity limits of nuclear magnetic resonance experiments searching for new fundamental physics

Tomographic entanglement indicators from NMR experiments

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