Quantum-enhanced rubidium atomic magnetometer based on Faraday rotation
via 795-nm Stokes operator squeezed light
- URL: http://arxiv.org/abs/2112.00186v3
- Date: Mon, 6 Dec 2021 02:26:02 GMT
- Title: Quantum-enhanced rubidium atomic magnetometer based on Faraday rotation
via 795-nm Stokes operator squeezed light
- Authors: Lele Bai, Xin Wen, Yulin Yang, Lulu Zhang, Jun He, Yanhua Wang, and
Junmin Wang
- Abstract summary: polarization squeezed state (PSS) of 795-nm light has been used in rubidium-87 (87Rb) atomic magnetometer.
PSS with a squeezing level of -3.7 has been achieved around the analysis frequency of 10 kHz.
A typical sensitivity of 19.5 pT/Hz1/2 has been achieved employing PSS of Stokes operator S2 as the probe, compared with a sensitivity of 28.3 pT/Hz1/2 using PCS as the probe.
- Score: 25.204247946000425
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: With the help of Stokes operator S2 squeezed state (also called polarization
squeezed state (PSS)) of 795-nm light, rubidium-87 (87Rb) atomic magnetometer
based on Faraday rotation has been implemented and characterized.The PSS of
Stokes operator S2 of 795-nm light has been prepared by means of coherently
combining the polarization coherent state (PCS) of a linearly p-polarized
bright 795-nm light beam and a linearly s-polarized squeezed vacuum state (SVS)
generated by a 397.5-nm ultraviolet laser pumped sub-threshold optical
parametric oscillator (OPO) with a PPKTP bulk crystal inside the OPO cavity.PSS
with a squeezing level of -3.7 has been achieved around the analysis frequency
of 10 kHz. At different transitions of D1 line, various frequency detuning, and
reasonable atomic vapor cells temperature, Faraday rotation has been measured
and compared.To decrease absorption (scattering) losses and the back-action
from atomic spin noise to the probe beams polarization noise for maintaining
the quantum properties of PSS of Stokes operator S2 of 795-nm light, we had to
run our magnetometer with 87Rb vapor cells temperature below 60, at which the
PSS was almost destroyed.The sensitivities of magnetic field measurement were
characterized via measuring signal-to-noise ratio of the alternating current
(AC) calibrated magnetic field signal with a balanced polarimeter. Under the
conditions of the atomic number density of 5.8*1010 /cm3 and the probe beam
with a detuning of - 400 MHz relative to the 5S1/2 (Fg=2) - 5P1/2 (Fe=1)
transition of 87Rb D1 line, a typical sensitivity of 19.5 pT/Hz1/2 has been
achieved employing PSS of Stokes operator S2 as the probe, compared with a
sensitivity of 28.3 pT/Hz1/2 using PCS as the probe.We preliminarily
demonstrated that the quantum-enhanced sensitivity in a Faraday-rotation-based
87Rb atomic magnetometer with the help of PSS of 795-nm light.
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