Abstract
We report dressed intensity noise correlation and intensity-difference squeezing based on spontaneous parametric four-wave mixing (SP-FWM) in Pr³⁺:Y₂SiO₅ crystal both experimentally and theoretically. We found such intensity noise correlation and intensity-difference squeezing can be controlled by using the dressing effect to manipulate the nonlinear optical coefficient of the SP-FWM process. By changing detuning and power of the optical field, we manipulate the nonlinear optical coefficient of the SP-FWM process, thus control the correlation and squeezing. The results show stronger correlation and squeezing with single dressing, while weaker near the resonant point due to destructive double dressing. Furthermore,we observed the dependence of correlation times on the power of dressing field, and explained by the combination of the dressing effect and induced dipole-dipole interaction. We also showed the fourth-order fluorescence signals accompanying with the SP-FWM process.
Highlights
Quantum correlation plays vital role for motivational research for possible applications of quantum communication and quantum information processing
The great deal of work has been done in developing the control mechanism for nonlinear optical process, such as influence of a dressing field on parametric amplification of multi-wave mixing processes in an atomic system [6], polarization dressed multi-order fluorescence [7], interaction of double dressed multi-waves mixing in five level atomic systems [8]
The fluorescence signal appears a suppression dip with a weak peak at resonance. This phenomenon can be explained by the dressing effect, which will change from single dressing to double dressing when Δ1 is changed from −200/200 GHz to 0 GHz
Summary
Quantum correlation plays vital role for motivational research for possible applications of quantum communication and quantum information processing. The generations of correlated and entangled photon pairs by parametric processes have been widely studied, including parametric down-conversion process in nonlinear crystals [1, 2]. The great deal of work has been done in developing the control mechanism for nonlinear optical process, such as influence of a dressing field on parametric amplification of multi-wave mixing processes in an atomic system [6], polarization dressed multi-order fluorescence [7], interaction of double dressed multi-waves mixing in five level atomic systems [8]. The rare-earth-ion-doped crystals Pr3+:Y2SiO5 (Pr3+:YSO)in which the atomic coherence can be induced when interacting with multiple laser fields, have been used to realize electromagnetically induced transparency (EIT) [9,10,11,12], coherent storage and light velocity reduction [13,14,15], enhanced FWM process and all-optically controlled higher-order fluorescence signal with and without splitting [16]
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