Enhancement of spin noise spectroscopy of rubidium atomic ensemble by
using of the polarization squeezed light
- URL: http://arxiv.org/abs/2111.09572v1
- Date: Thu, 18 Nov 2021 08:22:07 GMT
- Title: Enhancement of spin noise spectroscopy of rubidium atomic ensemble by
using of the polarization squeezed light
- Authors: Lele Bai, Lulu Zhang, Yongbiao Yang, Rui Chang, Yao Qin, Jun He, Xin
Wen, and Junmin Wang
- Abstract summary: We demonstrate the enhancement of signal to noise ratio (SNR) by using of the polarization squeezed state (PSS) of 795 nm light field with Stokes operator S2 squeezed.
- Score: 18.169860302775472
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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 S2 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 power and atomic number density, the SNR and FWHM of SNS will
increase correspondingly. With the help of PSS of Stokes operator S2, quantum
enhancement of both SNR and FWHM of SNS signal has been demonstrated by
controlling optical power of the S2 polarization squeezed light beam or atomic
number density in our experiments.
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