Interspecies spin-noise correlations in hot atomic vapors

Mouloudakis, K.; Vouzinas, F.; Margaritakis, A.; Koutsimpela, A.; Mouloudakis, G.; Koutrouli, V.; Skotiniotis, M.; Tsironis, G. P.; Loulakis, M.; Mitchell, M. W.; Vasilakis, G.; Kominis, I. K.

doi:10.1103/physreva.108.052822

Cited by 4 publications

(1 citation statement)

References 116 publications

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“…However, this would not influence the fact that the initially uncorrelated atoms would produce quantum correlation by spin exchange collisions. In fact, the noise coupling induced by spin exchange has been found in alkali atomic ensemble [67,68]. We also evaluate the influence of coupling effects to projection noise of nuclear spin in appendix D. The result shows that the spin projection noise will be promoted comparing with no coupling case with a factor of η > 1, which is induced by the coupling from alkali atoms projection noise.…”

Section: Discussionmentioning

confidence: 89%

Mode analysis of spin field of thermal atomic ensembles

Wang,

Xia,

Quan

et al. 2024

Quantum Sci. Technol.

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The spin dynamics in a thermal atomic vapor cell have been investigated thoroughly over the past decades and have proven successful in quantum metrology and memory owing to their long coherent time and manipulation convenience. The existing mean field analysis of spin dynamics among the whole cell is sometimes inaccurate due to the non-uniform of the ensemble and spatial coupling of multi-physical fields interacting with the ensembles. Here we perform mode analysis onto the quasi-continuous spin field including atomic thermal motion to derive Bloch mode equations and obtain corresponding analytical solutions in diffusion regime. We show that the widely used mean field dynamics of thermal gas is a particular case in our solution corresponding to the uniform spatial mode. This mode analysis approach offers a precise method for analyzing the dynamics of the spin ensemble in greater details from a field perspective, enabling the effective determination of spatially non-uniform multi-physical field coupling with the spin ensembles, which cannot be accurately analyzed by the mean field method. Furthermore, this work paves a way to address noises and relaxation mechanisms associated with non-uniform fields and interatomic interactions, which are limiting the further improvement of ultrasensitive spin-based sensors.

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Section: Discussionmentioning

confidence: 89%

Mode analysis of spin field of thermal atomic ensembles

Wang,

Xia,

Quan

et al. 2024

Quantum Sci. Technol.

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Simulating spin biology using a digital quantum computer: Prospects on a near-term quantum hardware emulator

Alvarez,

Chowdhury,

Smith

et al. 2024

APL Quantum

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Understanding the intricate quantum spin dynamics of radical pair reactions is crucial for unraveling the underlying nature of chemical processes across diverse scientific domains. In this work, we leverage Trotterization to map coherent radical pair spin dynamics onto a digital gate-based quantum simulation. Our results demonstrated an agreement between the idealized noiseless quantum circuit simulations and established master equation approaches for homogeneous radical pair recombination, identifying ∼15 Trotter steps to be sufficient for faithfully reproducing the coupled spin dynamics of a prototypical system. By utilizing this computational technique to study the dynamics of spin systems of biological relevance, our findings underscore the potential of digital quantum simulation (DQS) of complex radical pair reactions and builds the groundwork toward more utilitarian investigations into their intricate reaction dynamics. We further investigate the effect of realistic error models on our DQS approach and provide an upper limit for the number of Trotter steps that can currently be applied in the absence of error mitigation techniques before losing simulation accuracy to deleterious noise effects.

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Spin noise spectroscopy of an alignment-based atomic magnetometer

Koźbiał,

Elson,

Rushton

et al. 2024

Phys. Rev. A

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Optically pumped magnetometers (OPMs) are revolutionizing the task of magnetic-field sensing due to their extremely high sensitivity combined with technological improvements in miniaturization which have led to compact and portable devices. OPMs can be based on spin-oriented or spin-aligned atomic ensembles which are spin polarized through optical pumping with circular or linear polarized light, respectively. Characterization of OPMs and the dynamical properties of their noise is important for applications in real-time sensing tasks. In our work, we experimentally perform spin noise spectroscopy of an alignment-based magnetometer. Moreover, we propose a stochastic model that predicts the noise power spectra exhibited by the device when, apart from the strong magnetic field responsible for the Larmor precession of the spin, white noise is applied in the perpendicular direction aligned with the pumping-probing beam. By varying the strength of the noise applied as well as the linear-polarization angle of incoming light, we verify the model to accurately predict the heights of the Larmor-induced spectral peaks and their corresponding linewidths. Our work paves the way for alignment-based magnetometers to become operational in real-time sensing tasks. Published by the American Physical Society 2024

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Interspecies spin-noise correlations in hot atomic vapors

Cited by 4 publications

References 116 publications

Mode analysis of spin field of thermal atomic ensembles

Mode analysis of spin field of thermal atomic ensembles

Simulating spin biology using a digital quantum computer: Prospects on a near-term quantum hardware emulator

Spin noise spectroscopy of an alignment-based atomic magnetometer

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