Observation of multi-Raman gain resonances in rubidium vapor

Liu, Jun; Wei, Dong; Wang, Jinwen; Yu, Ya Jun; Hu, Hua-jie; Gao, Hong; Li, Fuli

doi:10.1088/1674-1056/25/11/114204

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…1, we show the generation process of the BETB, which is named as the two-mode squeezed process. [34][35][36][37] This two-mode squeezed process can be accomplished by the FWM experiments. [38][39][40][41] The FWM transformation can be expressed as â1 = cosh r â0 + sinh r b † 0 e iθ 1 , b1 = e iθ 1 sinh r â † 0 + cosh r b0 ,…”

Section: The Proposed Model and Phase Sensitivity Estimation 21 The S...mentioning

confidence: 99%

Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Liu 刘,

Shao 邵,

Li 李

et al. 2024

Chinese Phys. B

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We focus on the Mach-Zehnder interferometer (MZI) with the input of a coherent beam and one of the bright entangled twin beams with an external power reference beam employed for measurement. The results show that the phase sensitivity can reach sub-Heisenberg limit and approach quantum Cramér-Rao bound by changing the squeezing parameters and the photon number of the coherent beam, under the phase-matching condition. The absence of the external power reference beam will degrade the performance of the phase sensitivity. Meanwhile, this scheme shows good robustness against the losses of the photon detectors. We present a detailed discussion about the phase sensitivities when the inputs are two coherent beams, or a coherent beam plus a single-mode squeezed vacuum beam based on the MZI. This scenario can be applied in the field of phase precision measurements and other optical sensors.

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Section: The Proposed Model and Phase Sensitivity Estimation 21 The S...mentioning

confidence: 99%

Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Liu 刘,

Shao 邵,

Li 李

et al. 2024

Chinese Phys. B

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“…To improve the phase sensitivity, an SU(1,1) interferometer was proposed by Yurke et al [6] and then has been investigated intensively [7][8][9][10]. Different from SU(2) interferometers, SU(1,1) interferometers replace the beam-splitter by a nonlinear process such as four wave mixing (FWM) and parametric amplification (PA) [11][12][13][14][15][16][17][18][19][20]. The research shows that the phase sensitivity of this SU(1,1) interferometer can not only beat the SNL and even reach the Heisenberg limit when it is injected by two vacuum beams [7].…”

Section: Introductionmentioning

confidence: 99%

Super-resolution and ultra-sensitivity of angular rotation measurement based on SU(1,1) interferometers using homodyne detection

Wei

et al. 2018

J. Opt.

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We theoretically explore the angular rotation measurement sensitivity of SU(1,1) interferometers with a coherent beam and a vacuum beam input by using orbital angular momentum (OAM). Compared with the OAM in an SU(2) interferometer, the SU(1,1) interferometer employing homodyne detection can further surpass the angular rotation shot noise limit and improve the resolution and sensitivity of angular rotation measurement. Two models are considered, one is that OAM is carried by a probe beam and the other one is a pump beam with the OAM. The sensitivity can be improved by higher OAM and nonlinear process with a large gain. The resolution can be enhanced in the case that the pump beam has OAM. Moreover, we present a brief discussion on the variation of resolution and sensitivity in the presence of photon loss.

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Enhanced third-order nonlinear processes based on Raman resonance

Pei¹

2020

Acta Phys. Sin.

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We observe experimentally huge enhanced four-wave mixing based on Raman resonance in an <sup>85</sup>Rb atomic vapor system. With the decrease of coupling field power or the increase of experimental temperature, the signal tends to be narrowed down in linewidth, and be basically the same spectrum as the stimulated Raman spectroscopy. It is found that the macroscopic polarization interference effect plays a crucial role in determining the nonlinear spectra. Further more, in the Doppler-broadened Λ-type energy level system, there is a strong relationship among electromagnetically induced transparency, four-wave mixing and stimulated Raman spectroscopy. The sharp transparent window in electromagnetically induced transparency can be interpreted as the suppression of Raman gain on the linear absorption of the probe field. However, the four-wave mixing signal is a new field generated by the atomic vapor system, and it comes from the Raman gain which is affected and modified by the absorption and dispersion of the nonlinear optical medium. It shows that in a Λ-type Doppler-broadened system, in essence, both the electromagnetically induced transparency and enhanced four-wave mixing stem from stimulated Raman scattering based on the third-order nonlinear processes, just the spectra of which are from different ways and objects of detection.

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Observation of multi-Raman gain resonances in rubidium vapor

Cited by 3 publications

References 20 publications

Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Super-resolution and ultra-sensitivity of angular rotation measurement based on SU(1,1) interferometers using homodyne detection

Enhanced third-order nonlinear processes based on Raman resonance

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