Spin-noise spectrum of hot vapor atoms in an anti-relaxation-coated cell

Tang, Yuanjiang; Wen, Ya; Cai, Ling; Zhao, K.

doi:10.1103/physreva.101.013821

Cited by 29 publications

(16 citation statements)

References 48 publications

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“…The above discussion is only applicable to atomic vapor cell with homogeneous broadening mechanisms, and corresponding SNS is a Lorentz function centered on the larmor precession frequency in the frequency domain, depicted in figure 1(c). However, SNS with high SNR and narrow FWHM can also be achieved in an atomic vapor cell coated with an anti-relaxation film like octadecyltrichlorosilane [15] on the inner wall due to the reduced destructive effect by wall collisions on atomic spin.…”

Section: Theoretical Analysismentioning

confidence: 99%

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Bai,

Zhang,

Yang

et al. 2021

Preprint

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We measured the spin noise spectroscopy (SNS) of rubidium atomic ensemble with two different atomic vapor cells (filled with the buffer gases or coated with paraffin film on the inner wall), and demonstrated the enhancement of signal-to-noise ratio (SNR) by using of the polarization squeezed state (PSS) of 795-nm light field with Stokes operator Λ S 2 squeezed. PSS is prepared by locking the relative phase between the squeezed vacuum state of light obtained by a sub-threshold optical parametric oscillator and the orthogonal polarized local oscillator beam by means of the quantum noise lock. Under the same conditions, PSS can be employed not only to improve SNR, but also to keep the full width at half maximum (FWHM) of SNS unchanged, compared with the case of using polarization coherent state (PCS), and the enhancement of SNR is positively correlated with the squeezing level of PSS. With the increase of probe laser's power and atomic number density, the SNR and FWHM of SNS will increase correspondingly. With the help of PSS of Stokes operator Λ S 2 , quantum enhancement of both SNR and FWHM of SNS signal has been demonstrated by controlling optical power of the Λ S 2 polarization squeezed light beam or atomic number density in our experiments.

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Section: Theoretical Analysismentioning

confidence: 99%

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Bai,

Zhang,

Yang

et al. 2021

Preprint

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“…In the absence of finite magnetization along the light propagation direction, the dynamical magnetic properties of the sample can be found from the temporal fluctuations of dispersive Faraday rotation. Such Faraday rotation noises have been extensively studied within the spin noise spectroscopy (SNS) [14][15][16] technique to detect the intrinsic spin dynamics in atomic vapors [17][18][19][20], semiconductor heterostructures [21], quantum dots [22,23], spin-exchange collisions [24,25] and exciton-polaritons [26,27]. The SNS is also applied for precision magnetometry by using a spectral resolution of the spin noise signals from thermal atomic vapors [17,18] or semiconductors [28].…”

mentioning

confidence: 99%

Detection of Spin Coherence in Cold Atoms via Faraday Rotation Fluctuations

Swar¹,

Roy²,

Bhar³

et al. 2021

Preprint

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We report non-invasive detection of spin coherence in a collection of Raman-driven cold atoms using dispersive Faraday rotation fluctuation measurements, which opens up new possibilities of probing spin correlations in quantum gases and other similar systems. We demonstrate five orders of magnitude enhancement of the measured signal strength than the traditional spin noise spectroscopy with thermal atoms in equilibrium. Our observations are in good agreement with the comprehensive theoretical modeling of the driven atoms at various temperatures. The extracted spin relaxation rate of cold rubidium atoms with atom number density ∼10 9 /cm 3 is of the order of 2π×0.5 kHz at 150 µK, two orders of magnitude less than ∼ 2π×50 kHz of a thermal atomic vapor with atom number density ∼10 12 /cm 3 at 373 K.

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“…Recently, collisions between alkali atoms and chemically inert atoms or molecules have attracted considerable attention in the areas of frequency standards [6,9], metrology [15][16][17][18][19][20], and quantum information [23,24]. Recently, direct measurement of quantum spin noise in thermodynamic equilibrium by optical rotation is becoming a mainstream approach for non-perturbative studies of energy structures [25][26][27][28][29][30][31][32][33][34][35][36], spatial properties [37][38][39] and correlated states [40][41][42][43] in diverse systems, such as alkali atomic vapors [25,26,44,45]. Collision phenomena can be investigated by measuring the energy spectrum of collid-ing particles via spin-noise techniques.…”

mentioning

confidence: 99%

“…However, current spin-noise techniques are not suitable to measure collisions. Existing spin-noise works mostly are limited to measure spin noise originated from Zeeman sublevels [26,30,36,37], where the collisional frequency shifts are only on the order of 10 −2 Hz [7] and challenging to observe. Moreover, although the hyperfine frequency shifts are on the order of 100 kHz, existing techniques suffer from a trade-off between bandwidth and spectral resolution.…”

mentioning

confidence: 99%

Collision-induced spin noise

Song,

Jiang,

Qin

et al. 2021

Preprint

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Collision phenomena are ubiquitous and of importance in determining the microscopic structures and intermolecular interactions of atoms and molecules. The existing approaches are mostly based on atomic or molecular scatterings, which are hindered by the inconvenience of using ultra-high vacuum and low temperature systems. Here we demonstrate a new spin-noise spectroscopic approach by measuring optical polarization rotation noise of the probe light, which operates with simple apparatus and ambient conditions. Our approach features tens of gigahertz bandwidth and one part-per-million resolution, outperforming existing spin-noise techniques. Enabled by the new technique, we observe the collision-induced spin noise of alkali atoms, and precisely determine key collision parameters, such as collision diameter, well depth, and dominant interaction type. Our work provides a new tool to study a broad range of collision phenomena under ambient conditions.

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Spin-noise spectrum of hot vapor atoms in an anti-relaxation-coated cell

Cited by 29 publications

References 48 publications

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Detection of Spin Coherence in Cold Atoms via Faraday Rotation Fluctuations

Collision-induced spin noise

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