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Related Concept Videos

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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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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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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Related Experiment Video

Updated: Jan 22, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Silicon photonic add-drop filter for quantum emitters.

Shahriar Aghaeimeibodi, Je-Hyung Kim, Chang-Min Lee

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    Researchers integrated quantum dots with silicon photonics to control single photons on-chip. This advancement enables filtering and routing of quantum dot emissions for quantum information processing applications.

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    Area of Science:

    • Quantum Information Science
    • Nanotechnology
    • Integrated Photonics

    Background:

    • Silicon photonics offers a platform for complex quantum information processing circuits.
    • Integrating single-photon sources and detectors is crucial for advancing quantum technologies.

    Purpose of the Study:

    • To demonstrate the integration of quantum dots with a silicon photonic add-drop filter.
    • To achieve on-chip filtering and routing of telecom photons emitted by quantum dots.

    Main Methods:

    • Utilized a silicon microdisk resonator as a narrow filter for quantum dot emission.
    • Controlled quantum dot emission transmission by tuning wavelength relative to the microdisk resonance.

    Main Results:

    • Successfully filtered background light and transferred quantum dot emission using the silicon microdisk.
    • Demonstrated on-chip control over the routing of quantum dot emissions to specific channels of the add-drop filter.

    Conclusions:

    • This integration represents a significant step towards on-chip control of single photons.
    • The developed system is applicable to quantum information processing, including linear optical quantum computation and boson sampling.