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Scientific Reports

Switching Correlation and Noise Level in Pr3+:YSO Crystal via Dressing Nonlinear Phase

Irfan Ahmed, Zhaoyang Zhang, Feng Wen, Da Zhang, Changbiao Li, Ruimin Wang, Yanpeng Zhang

Published Sep 21, 2016• 4 citations
Publisher

Abstract

We propose and experimentally demonstrate that the intensity noise correlation and the noise level of intensity-difference and intensity-sum in Stokes and anti-Stokes channel can be well controlled by the relative nonlinear phase in spontaneous parametric four-wave mixing process. By modulating the relative nonlinear phase, including self-phase modulation and cross-phase modulation, switching the correlation into anti-correlation and the relative intensity noise level between the intensity-difference and intensity-sum are realized. We also show that the variation tendencies of the relative intensity noise level and the corresponding intensity fluctuations correlation are in accordance with each other.

DOI
10.1038/srep33568

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Abstract Rare earth doped crystal Pr 3+ :Y 2 SiO 5 has unique features, whose nonlinear response is dynamically triggered and modulated by the interaction between dressing and phonon effect. In this article, we have demonstrated the switching from two-mode bunching to anti-bunching like phenomenon of noise intensity fluctuations used for noise correlation. Here, switching in bunching phenomenon is caused by relative nonlinear phase, which is induced by self- and cross-phase modulation. In contrast with two-mode bunching, three-mode bunching case hardly follows the switching mechanism attributed to the destructive interaction among the phases of Stokes, anti-Stokes and FL signals. We also have realized switching and routing application in two and three mode bunching. Both functions (switching and routing) are controlled by manipulating temperature of cryostat and gate delay. Our experimental results provide the novel technique for switching and channel equalization ratio of about 96%. The intensity switching speed is achieved about 17 ns.
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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.
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