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Related Concept Videos

Upsampling01:22

Upsampling

692
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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Downsampling01:20

Downsampling

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Modelling parametric down-conversion yielding spectrally pure photon pairs.

Fabian Laudenbach, Hannes Hübel, Michael Hentschel

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    This study presents a method to generate spectrally pure photon pairs using spontaneous parametric down-conversion (SPDC) without filters. This technique significantly increases photon count rates for quantum information applications.

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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Spontaneous parametric down-conversion (SPDC) is a key source for single-photon states in quantum information experiments.
    • Achieving spectrally pure photons requires frequency-uncorrelated pairs, often necessitating narrow bandpass filters that reduce count rates.

    Purpose of the Study:

    • To theoretically and numerically evaluate a method for engineering intrinsically pure SPDC quantum states.
    • To eliminate the need for bandpass filtering in SPDC setups, thereby increasing output intensities.

    Main Methods:

    • Utilizing pulsed pump lasers and periodically poled crystals to engineer intrinsic spectral purity.
    • Performing theoretical analysis and numerical evaluation across various wavelength regimes, polarization configurations, and nonlinear crystals.

    Main Results:

    • Demonstrated a method to achieve intrinsically pure SPDC quantum states without external filtering.
    • Identified a broad variety of setups enabling higher output intensities and count rates.

    Conclusions:

    • The proposed method offers a more efficient approach to generating high-quality single-photon states for quantum applications.
    • Eliminating bandpass filters enhances practicality and performance in quantum information experiments using SPDC.