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Related Experiment Video

Updated: Jun 22, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Thermal photon statistics in spontaneous parametric downconversion.

Fabio Paleari, Alessandra Andreoni, Guido Zambra

    Optics Express
    |June 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We studied photon statistics in parametric downconversion. Without an idler seed, generated fields exhibit thermal photon-number statistics, indicating mixed modes.

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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    Last Updated: Jun 22, 2026

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

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    Published on: September 5, 2019

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

    Published on: May 30, 2014

    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Solid-state physics

    Background:

    • Parametric downconversion is a key nonlinear optical process for generating quantum states of light.
    • Understanding photon statistics is crucial for quantum information applications.
    • Previous studies often focused on specific modes or coherent states.

    Purpose of the Study:

    • To investigate photon statistics in frequency nondegenerate parametric downconversion.
    • To compare results with and without an idler seed field.
    • To characterize the nature of generated photon fields.

    Main Methods:

    • Utilizing frequency nondegenerate parametric downconversion in beta-barium borate.
    • Employing a high-power traveling-wave pump pulse from an amplified Nd:YLF picosecond laser.
    • Measuring photon number statistics using a simple detection technique.

    Main Results:

    • Observed thermal photon-number statistics in the generated signal beam.
    • Found that generated fields are mixtures of equally occupied modes when both signal and idler are in vacuum states.
    • Demonstrated the influence of the idler field's initial state on photon statistics.

    Conclusions:

    • The study reveals the complex photon statistics arising from parametric downconversion under specific conditions.
    • Results highlight the importance of initial field states in determining the quantum properties of generated light.
    • Findings contribute to the fundamental understanding of light generation in nonlinear media.