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Oscillations In An LC Circuit01:30

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Low random duty-cycle errors in periodically poled KTP revealed by sum-frequency generation.

Felix Mann, Helen M Chrzanowski, Sven Ramelow

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    High-quality periodically poled potassium titanyl phosphate (ppKTP) crystals show near-ideal performance for quantum frequency conversion. This material significantly reduces noise, enabling more efficient quantum technologies.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Materials science

    Background:

    • Quantum frequency conversion is crucial for quantum technologies.
    • Low-noise operation is challenging, especially with shorter pump wavelengths.
    • Fabrication errors in nonlinear crystals increase parasitic downconversion.

    Purpose of the Study:

    • To characterize the poling quality of commercial periodically poled bulk potassium titanyl phosphate (ppKTP).
    • To assess ppKTP's suitability for low-noise quantum frequency conversion.

    Main Methods:

    • Measured sum-frequency generation (SFG) efficiency across a wide phase mismatch range (0 to >400π).
    • Analyzed SFG efficiency to evaluate poling quality and identify parasitic downconversion.

    Main Results:

    • ppKTP exhibited nearly ideal SFG efficiency, dropping to 10⁻⁶.
    • Background noise from duty-cycle errors in ppKTP was substantially lower than in periodically poled lithium niobate.
    • Estimated standard deviation of duty-cycle errors in ppKTP to be <2%.

    Conclusions:

    • ppKTP demonstrates excellent poling quality for quantum frequency conversion.
    • ppKTP offers at least a 10x reduction in noise spectral density compared to current converters.
    • ppKTP is a promising material for advancing low-noise quantum technologies.