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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.0K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Related Experiment Video

Updated: Jun 7, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Deterministic single photon subtraction with a cascade of waveguide-coupled atoms.

Abdolreza Pasharavesh, Michal Bajcsy

    Optics Express
    |November 14, 2024
    PubMed
    Summary

    This study introduces a novel photon subtraction scheme using two emitters and chiral waveguides. It deterministically extracts single photons, enhancing quantum key distribution security against attacks.

    Area of Science:

    • Quantum Optics
    • Quantum Information Science

    Background:

    • Deterministic single-photon sources are crucial for quantum technologies.
    • Existing methods for photon subtraction face limitations in efficiency and state preservation.

    Purpose of the Study:

    • To develop a specialized photon subtraction scheme for deterministic single-photon extraction.
    • To enhance the security of quantum key distribution (QKD) against photon number splitting attacks.

    Main Methods:

    • Integration of two Λ-type emitters coupled to a chiral waveguide via single photon Raman interaction (SPRINT).
    • Development of a theoretical model using input-output formalism within the SLH framework.
    • Numerical simulations of the system's interaction with few-photon pulses.

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    Main Results:

    • The proposed scheme enables deterministic extraction of single photons from multiphoton states.
    • Input single-photon states are preserved unaltered during the subtraction process.
    • The two-emitter extension of SPRINT improves upon the original scheme for QKD security.

    Conclusions:

    • The developed scheme offers a robust method for generating high-quality single photons.
    • This advancement significantly strengthens the security of quantum key distribution protocols.
    • The SPRINT-based approach provides a promising avenue for future quantum communication systems.