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Related Concept Videos

Upsampling01:22

Upsampling

204
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
204

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Integrated, bright broadband, two-colour parametric down-conversion source.

René Pollmann, Franz Roeder, Victor Quiring

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    Summary
    This summary is machine-generated.

    Researchers developed a bright, broadband integrated quantum light source using a lithium niobate waveguide. This new source enables high-flux, time-frequency entangled photon pairs crucial for advanced quantum applications.

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    Area of Science:

    • Quantum optics
    • Integrated photonics
    • Nonlinear optics

    Background:

    • Broadband quantum light is essential for quantum metrology and spectroscopy.
    • Entangled two-photon absorption requires high photon flux and time-frequency entanglement.
    • Traditional spontaneous parametric down-conversion (SPDC) sources have limitations in wavelength and photon splitting.

    Purpose of the Study:

    • To demonstrate a novel integrated two-colour SPDC source.
    • To achieve high brightness and broad bandwidth for quantum applications.
    • To generate strong time-frequency entanglement in photon pairs.

    Main Methods:

    • Utilized a group-velocity matched lithium niobate waveguide.
    • Employed continuous wave (CW) laser light for pumping.
    • Converted narrow-band pump light to broadband pulses.

    Main Results:

    • Achieved exceptional brightness (1.52 × 10^6 pairs/mW/GHz) and large bandwidth (7.8 THz FWHM).
    • Generated photon pairs with short correlation times (~120 fs).
    • Maintained narrow pump bandwidth (<1 MHz), yielding strong time-frequency entanglement.

    Conclusions:

    • The integrated source provides a powerful resource for quantum metrology and spectroscopy.
    • The demonstrated technology overcomes limitations of bulk-crystal SPDC.
    • The source is adaptable to various central wavelengths and offers high performance.