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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Correlation steering in the angularly multimode Raman atomic memory.

Mateusz Mazelanik, Michał Dąbrowski, Wojciech Wasilewski

    Optics Express
    |September 24, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers can steer photon correlations in atomic memory using acousto-optic deflectors. This control over scattered light direction is crucial for advancing quantum information processing technologies.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Quantum Information Science

    Background:

    • Atomic ensembles serve as quantum memories for storing and retrieving photons.
    • Controlling photon correlations is essential for quantum communication and computation.

    Purpose of the Study:

    • To demonstrate the steering of photon correlation directions in an atomic memory.
    • To investigate the independent control of scattered photon propagation directions.

    Main Methods:

    • Utilized warm rubidium vapors as an atomic memory.
    • Employed acousto-optic deflectors (AODs) to control laser beam incidence angles.
    • Performed photon correlation measurements at various deflection angles.

    Main Results:

    • Successfully steered the direction of correlations between off-resonant Raman scattered photons.
    • Demonstrated independent and continuous control over anti-Stokes light propagation direction.
    • Showcased the ability to select the spatial mode of retrieved photons.

    Conclusions:

    • The study presents a method for controlling photon correlation directions in atomic memories.
    • This control is vital for selecting specific photon modes for quantum information processing applications.
    • The findings pave the way for enhanced quantum memory functionalities.