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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

276
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...
276
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.9K
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: Aug 31, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Resonant metasurfaces for generating complex quantum states.

Tomás Santiago-Cruz1,2, Sylvain D Gennaro3,4, Oleg Mitrofanov3,5

  • 1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany.

Science (New York, N.Y.)
|August 25, 2022
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Summary
This summary is machine-generated.

Semiconductor metasurfaces enable versatile quantum state engineering by relaxing momentum conservation constraints. These novel nonlinear metasurfaces boost entangled photon emission, paving the way for advanced quantum information technologies.

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Area of Science:

  • Quantum optics
  • Materials science
  • Nanophotonics

Background:

  • Quantum state engineering is crucial for quantum photonic technologies.
  • Traditional methods like spontaneous parametric down-conversion and four-wave mixing have limitations due to momentum conservation.
  • Nonlinear metasurfaces offer enhanced control over quantum states by relaxing these constraints.

Purpose of the Study:

  • To explore the use of nonlinear metasurfaces for advanced quantum state engineering.
  • To overcome the limitations of momentum conservation in photon generation.
  • To demonstrate the generation of complex multifrequency quantum states.

Main Methods:

  • Utilized semiconductor metasurfaces with high-quality factor, quasi-bound state in the continuum resonances.
  • Employed spontaneous parametric down-conversion to generate entangled photons.
  • Enhanced the quantum vacuum field to boost photon emission.

Main Results:

  • Achieved enhanced emission of nondegenerate entangled photons within multiple narrow resonance bands.
  • Demonstrated generation of multifrequency quantum states, including cluster states, over a wide spectral range.
  • Showcased the ability to generate quantum states using a single or multiple resonances pumped at various wavelengths.

Conclusions:

  • Nonlinear metasurfaces are versatile platforms for quantum state engineering.
  • These metasurfaces significantly expand the possibilities for creating complex quantum states.
  • The developed metasurfaces show great promise as sources for quantum information applications.