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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Entanglement in a four-wave mixing process.

Zhan Zheng, Hailong Wang, Bing Cheng

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    |July 15, 2017
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    Summary
    This summary is machine-generated.

    We investigated quantum entanglement in a four-wave mixing process. Higher pump power and nonlinear coupling enhance tripartite entanglement, even with photon loss.

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    Area of Science:

    • Quantum Optics
    • Nonlinear Optics
    • Quantum Information

    Background:

    • Four-wave mixing (FWM) is a key nonlinear optical process for generating entangled photons.
    • Understanding and quantifying multipartite entanglement is crucial for quantum information science.
    • The influence of experimental parameters on entanglement properties requires detailed investigation.

    Purpose of the Study:

    • To investigate different types of quantum entanglement generated via FWM with a degenerate pump.
    • To analyze the means and quantum fluctuations of the three output beams (Stokes, anti-Stokes, and pump).
    • To quantify bipartite, two-mode, and tripartite entanglement using the covariance matrix.

    Main Methods:

    • Experimental setup utilizing four-wave mixing with a degenerate pump.
    • Analysis of statistical properties (means and quantum fluctuations) of the output optical beams.
    • Quantification of entanglement using the covariance matrix formalism.

    Main Results:

    • Verified the existence of genuine tripartite entanglement among the three output beams.
    • Quantified various forms of entanglement, including bipartite, two-mode, and tripartite entanglement.
    • Identified input pump power and nonlinear coupling strength as key parameters for enhancing entanglement.

    Conclusions:

    • Genuine tripartite entanglement can be generated and verified in this FWM system.
    • Entanglement properties are tunable via control of pump power and nonlinear coupling.
    • These findings offer insights into optimizing entanglement generation in optical systems, even under photon loss.