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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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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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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Spectrally multiplexed Hong-Ou-Mandel interference with weak coherent states.

Oriol Pietx-Casas, Gustavo Castro do Amaral, Tanmoy Chakraborty

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    We demonstrate a virtually imaged phased array as a spectral-to-spatial mode-mapper for quantum communication. This setup enables spectrally resolved Hong-Ou-Mandel interference, crucial for quantum repeaters and key distribution.

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    Area of Science:

    • Quantum communication
    • Quantum optics
    • Photonics

    Background:

    • Quantum communication systems require efficient methods for manipulating and interfering photons based on their spectral properties.
    • Virtually imaged phased arrays (VIPAs) offer a promising platform for spectral-to-spatial mapping.

    Purpose of the Study:

    • To investigate the suitability of a VIPA as a spectral-to-spatial mode-mapper (SSMM) for quantum communication applications.
    • To demonstrate spectrally resolved Hong-Ou-Mandel (HOM) interference using VIPA-based SSMMs.

    Main Methods:

    • Generating spectral sidebands on an optical carrier.
    • Preparing weak coherent states (WCSs) in distinct spectral modes.
    • Utilizing a beam splitter, two SSMMs, and single-photon detectors to measure HOM interference.
    • Analyzing coincidence detection patterns for matching and unmatched spectral modes.

    Main Results:

    • Successfully observed the HOM dip in coincidence detection patterns for matching spectral modes.
    • Achieved high interference visibilities up to 45% with WCSs.
    • Demonstrated significantly reduced visibility for unmatched spectral modes, confirming spectral selectivity.
    • Identified the optical arrangement as a candidate for spectrally resolved Bell-state measurements.

    Conclusions:

    • VIPAs are suitable SSMMs for quantum communication, enabling spectrally resolved HOM interference.
    • The demonstrated setup can be adapted for spectrally resolved Bell-state measurements, a key component in quantum key distribution.
    • Simulations suggest a trade-off between secret key generation rate and system complexity in spectrally multiplexed quantum communication links.