Multiple frequency conversion via atomic spin coherence of storing a light pulse

Wang, Lei; Luo, Mengxi; Sun, Jiaxiang; Sun, Yuan-Hang; Chen, Yi; Wei, Xiao-Gang; Kang, Zhi‐Hui; Wang, Haihua; Gao, Jin‐Yue

doi:10.1088/1674-1056/24/6/064205

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…It can be used to change the frequency of a quantum state to a desired one. [4,5] It is proved that the properties of quantum states of light can be maintained during QFC, including non-classical correlation, [6] entanglement, [7] non-classical photon statistics, [8][9][10][11] photon coherence, [12,13] and orbital angular momentum. [14] Recently, the successful experiments of spectral compression of single photons, [15] infrared or mid-infrared up-conversion imaging, [16,17] and quantum up-conversion of squeezed states [18,19] has aroused interest in exploring more applications of QFC.…”

Section: Introductionmentioning

confidence: 99%

Quantum frequency doubling based on tripartite entanglement with cavities

2016

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We analyze the entanglement characteristics of three harmonic modes, which are the output fields from three cavities with an input tripartite entangled state at fundamental frequency. The entanglement properties of the input beams can be maintained after their frequencies have been up-converted by the process of second harmonic generation. We have calculated the parametric dependences of the correlation spectrum on the initial squeezing factor, the pump power, the transmission coefficient, and the normalized analysis frequency of cavity. The numerical results provide references to choose proper experimental parameters for designing the experiment. The frequency conversion of the multipartite entangled state can also be applied to a quantum communication network.

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Section: Introductionmentioning

confidence: 99%

Quantum frequency doubling based on tripartite entanglement with cavities

2016

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Optical precursors via spontaneously generated coherence

Ba¹,

Wang²,

Wang³

et al. 2016

Acta Phys. Sin.

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Optical precursors were first studied by Sommerfield and Brillouin in 1914 to resolve the apparent contradictions between fast light propagation and the theory of relativity. They showed theoretically that the front edge of a step-modulated pulse does not interact with the medium and always travels at c because the dispersive material has a finite response time to the optical pulse. The past experimental studies of precursors in classical pulse propagation were always focused on an opaque medium with single or multiple Lorentz absorption lines. In these cases, the precursor signal cannot be separated from the main pulse or otherwise the main field is absorbed. However, the electromagnetically induced transparency (EIT) technique was successfully used to separate precursors from the main pulse due to the slow-light effect in cold atoms. The EIT refers to the absorption suppression or elimination of a probe field through atomic coherence in a certain medium dressed by a strong coupling field. In this paper, a four-level double-lambda atomic system with two upper states coupled to the excited state is explored to separate optical precursors from a square-modulated laser pulse with the effect of spontaneously generated coherence (SGC). The SGC effect occurs in the process of spontaneous emission, in which the atom decays from closely placed upper levels to a single ground level. The quantum interference between the decay channels takes place, which leads to decay induced transparency, thus enhancing the Kerr nonlinearity and amplification without inversion. With the assistance of spontaneously generated coherence, an EIT window appears with steep normal dispersion when the trigger field is far from resonance. Then we can obtain the optical precursors which are separated from the main pulse due to the slow-light effects in the EIT window. In the absence of SGC, the main pulse is absorbed by an opaque medium with Lorentz absorptive lines, so the slow-light effect could not take place. In addition, we obtain the stacked optical precursors with the input probe field amplitude or phase modulated by designing a series of square pulses. For the amplitude modulation case, the peak power reaches about 4.5 times that of the input pulse. With the phase modulation we obtain a transient pulse with a peak power of 14 times that of the input, as a result of constructive interference between the stacked precursors and main field. We expect these findings to be instructive in devising optical devices for optical communication, detection and medical imaging among other applications.

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Multiple frequency conversion via atomic spin coherence of storing a light pulse

Cited by 2 publications

References 23 publications

Quantum frequency doubling based on tripartite entanglement with cavities

Quantum frequency doubling based on tripartite entanglement with cavities

Optical precursors via spontaneously generated coherence

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