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Related Concept Videos

IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Hybrid quantum network for sensing in the acoustic frequency range.

Valeriy Novikov1,2, Jun Jia1, Túlio Brito Brasil1

  • 1Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.

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This study introduces a broadband quantum sensing tool that uses quantum state processing to reduce quantum noise across a wide optical spectrum and acoustic frequency range. The technique enhances sensitivity for applications like gravitational-wave detection.

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Area of Science:

  • Quantum optics
  • Quantum sensing
  • Atomic physics

Background:

  • Quantum noise limits sensor sensitivity.
  • Entanglement can surpass standard quantum limits.
  • Current quantum optical sensing is limited by fixed wavelengths and acoustic noise challenges.

Purpose of the Study:

  • To develop a broadband quantum sensing tool.
  • To overcome limitations of fixed wavelengths and acoustic noise in quantum sensing.
  • To demonstrate frequency-dependent quantum noise reduction.

Main Methods:

  • Utilizing quantum state processing for broadband applicability.
  • Coupling an atomic spin ensemble to a frequency-tunable Einstein-Podolsky-Rosen (EPR) light source.
  • Engineering the spin ensemble as a tunable oscillator for noise reduction.

Main Results:

  • Demonstrated quantum noise suppression over an octave in the acoustic frequency range.
  • Achieved frequency-dependent quantum noise reduction at a disparate wavelength.
  • Showcased tunability for targeting quantum noise in systems from kHz to MHz.

Conclusions:

  • The developed tool offers broadband quantum sensing capabilities.
  • The approach is applicable to gravitational-wave detectors and other quantum technologies.
  • Enables quantum-noise-limited sensitivity in challenging frequency ranges.