Quantum-enhanced rubidium atomic magnetometer based on Faraday rotation via 795 nm stokes operator squeezed light

With the help of Stokes operator S2 squeezed state (also called polarization (PSS)) 795-nm light, rubidium-87 (87Rb) atomic magnetometer based on Faraday rotation has been implemented and characterized.The PSS light prepared by means coherently combining coherent (PCS) a linearly p-polarized bright beam s-polarized vacuum (SVS) generated 397.5-nm ultraviolet laser pumped sub-threshold optical parametric oscillator (OPO) with PPKTP bulk crystal inside OPO cavity.PSS squeezing level -3.7 achieved around analysis frequency 10 kHz. At different transitions D1 line, various detuning, reasonable vapor cells temperature, measured compared.To decrease absorption (scattering) losses back-action from spin noise to probe beams for maintaining quantum properties we had run our 87Rb temperature below 60, at which was almost destroyed.The sensitivities magnetic field measurement were characterized via measuring signal-to-noise ratio alternating current (AC) calibrated signal balanced polarimeter. Under conditions number density 5.8*1010 /cm3 detuning - 400 MHz relative 5S1/2 (Fg=2) 5P1/2 (Fe=1) transition typical sensitivity 19.5 pT/Hz1/2 employing as probe, compared 28.3 using PCS probe.We preliminarily demonstrated that quantum-enhanced in Faraday-rotation-based light.