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Related Concept Videos

State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Cluster Sampling Method01:20

Cluster Sampling Method

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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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State Space to Transfer Function01:21

State Space to Transfer Function

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The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
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Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Related Experiment Video

Updated: Feb 19, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

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Large-scale continuous-variable dual-rail cluster entangled state based on spatial mode comb.

J Zhang, J J Wang, R G Yang

    Optics Express
    |November 3, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a new method to create large-scale continuous-variable (CV) dual-rail cluster entangled states using a spatial mode comb. This breakthrough offers a practical entangled source for quantum information processing.

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    Last Updated: Feb 19, 2026

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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Recent advancements in continuous-variable (CV) multipartite entanglement have focused on multiplexing schemes.
    • Increasing the number of fully inseparable light modes is crucial for quantum technologies.

    Purpose of the Study:

    • To propose a novel scheme for establishing large-scale CV dual-rail cluster entangled states.
    • To utilize a spatial mode comb within a self-imaging optical parametric oscillator for entanglement generation.

    Main Methods:

    • Employing a self-imaging optical parametric oscillator pumped by two spatial Laguerre-Gaussian modes.
    • Utilizing a spatial mode comb to generate a large-scale entangled state (≥ 20 modes).
    • Applying a sufficient condition for full inseparability to quantify entanglement.

    Main Results:

    • Demonstrated the establishment of a large-scale CV dual-rail cluster entangled state.
    • Confirmed the existence of entanglement across a broad range of analyzing frequencies and pump parameters.
    • Identified a new scheme for large-scale entanglement generation using an optical parametric cavity and spatial mode comb.

    Conclusions:

    • The presented system offers a practical entangled source for quantum information applications.
    • The spatial mode comb approach is effective for generating large-scale entanglement.
    • This work advances the development of robust quantum information processing tools.