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Journal of Applied Physics

Polarization controlled hybrid line shape and switching of noise correlation via Autler-Town splitting

Changbiao Li, Irfan Ahmed, Ghulam Abbas Khan, Da Zhang, Mingyu Xu, Ruimin Wang, Yanpeng Zhang

Published Oct 26, 2017• 0 citations
Publisher

Abstract

We report the experimental observations of the second- and third-order hybrid intensity noise correlation and intensity difference squeezing among two different multi-order nonlinear fluorescence (FL) and two FL signals as well as one of pair of phase conjugate four-wave mixing in a Pr3+:Y2SiO5 crystal, respectively. The degrees of the correlation and squeezing as well as the sharp and broad peaks are studied by changing the polarization of laser fields and gate position in Λ-type three-level systems. We observed the multi-channel hybrid intensities' correlation among the composite and coexisting signals, which turn out to be positive and negative for the cases without and with Autler-Town splitting of FL, respectively. A wide broad peak and a high sharp peak are observed with respect to the degrees of correlation and polarization state controlled by wave plates. Such results may find potential applications in optical transistor and optical hybrid communications.

DOI
10.1063/1.4998655

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Abstract We report the generation of three-mode hybrid intensity-noise correlation and intensity-difference squeezing of spontaneous parametric four-wave mixing (SP-FWM) and fourth-order fluorescence (FL) signals in the heteronuclear-like (three-level Λ-type) molecular structure of a Pr3+:Y2SiO5 (Pr3+:YSO) crystal using the nonlinear cross-Kerr effect under a polarized dressing effect. In the semi-classical view of a Kerr nonlinear medium, the amplitude of two-mode hybrid correlations of this kind is subject to a limit determined by the hybrid maximally entangled state. Whereas the degree of correlation and squeezing is determined by the dressing effects of the input laser fields participating in the SP-FWM process. We also find that the variations in magnitude of three-mode hybrid intensity-noise correlation and intensity-difference squeezing are consistent with nonlinear cross-Kerr processes. Such a three-mode hybrid signal may have potential applications in long-distance communication, dense coding, all-optical communication and quantum storage on photonic chips.
Two- and three-mode correlation and squeezing of spontaneous parametric four-wave mixing (SPFWM) and fourth-order fluorescence (FL) composite signals are investigated theoretically and experimentally in both homonuclear (two-level) and heteronuclearlike (V-type level) molecular systems of Pr3+\mathrm{P}{\mathrm{r}}^{3+}Pr3+:YSO. By selecting different time positions, changing the power, and changing the frequency detuning of the laser field, the competition between the composite signals is demonstrated. It is found that as the laser parameters change, the signal evolves from a nonlinear ${\ensuremath{\chi}}^{(4)}$ process resulting in a FL signal to a SPFWM signal $({\ensuremath{\chi}}^{(3)}$ process). In addition, the competition effect between the signals determines the evolution of the shape of the correlation from a pure sharp to a two-stage (mixed) shape and finally to a pure broad peak amplitude. Furthermore, the signal evolution determines the magnitude of squeezing, which can control the noise level. Such progress may find potential applications in optical hybrid communication and information processing.
Abstract We report the evolution of spontaneous parametric four-wave mixing (SP-FWM) as a small peak in the dip of Autler–Townes splitting in the medium of coherent non linear crystal of Pr 3+ :Y 2 SiO 5 . We demonstrate the results of a composite signal with evolution from pure fluorescence to a hybrid state of light to pure SP-FWM. By investigating the composite signal in frequency/time domains and studying hybrid correlations (positive/negative or anti-correlation) among three channels, i.e. Stokes (anti-Stokes) with composite signal, we demonstrate the evolution of SP-FWM processes from fluorescence. Such correlations can have potential applications in all-optical communication and quantum teleportation.
We explore the alteration that occurs in Autler-Townes (AT) splitting caused by the competition of phonon intensity and polarized dressing fields in second-order fluorescence (FL) signals in both the spectral and the time domain. By varying the polarization dressing along with temperature, we control the AT-splitting of the FL signal. Furthermore, we analyze the noise correlation and squeezing of spontaneous four-wave mixing (SP-FWM) to investigate the effect of phonon and polarized dressing fields. These results are applied for optical temperature sensors and switching devices, which can be controlled by the competition between phonon and polarization dressing. Optical temperature sensor sensitivity and switching speeds are 96% and 15 ns, respectively.
We report the experimental observation of the intensity noise correlation and squeezing between counter propagating Stokes and anti-Stokes signals in Pr(3+):Y2SiO5 crystals. Both the degree of correlation and squeezing as well as the oscillation frequency of correlation curves are modulated by changing the polarization states and powers of the dressing fields. The double-dressed effect and the triple-dressed effect in V-type three-level, Λ-type three-level and N-type four-level systems are compared. The polarization and power dependencies in these systems are different, and the oscillation frequency of the correlation curve in the triple-dressed process is greater than that of the double-dressed process. Our results show that the correlation and squeezing of photon pairs can be controlled via polarized dark states.