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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.2K
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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Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Indirect generation involves an...
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Updated: Mar 18, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Deterministic generation of large scale atomic W states.

Xue-Ping Zang, Ming Yang, Fatih Ozaydin

    Optics Express
    |July 14, 2016
    PubMed
    Summary

    We developed a simple method to create large atomic W states using cavity quantum electrodynamics (QED). This technique deterministically expands smaller W states to larger ones, simplifying quantum information processing.

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    Area of Science:

    • Quantum Information Science
    • Atomic Physics
    • Cavity Quantum Electrodynamics (QED)

    Background:

    • Atomic W states are crucial for quantum information and thermodynamics.
    • Generating large-scale W states deterministically is experimentally challenging.

    Purpose of the Study:

    • To present a simplified, deterministic scheme for generating large-scale atomic W states.
    • To enable scalable W state generation for quantum applications.

    Main Methods:

    • Utilizing a detuned interaction between two identical atoms and a vacuum cavity mode.
    • Implementing a simple expansion mechanism to scale W states.

    Main Results:

    • A W-type Bell pair can be created with unit probability.
    • An n-atom W state can be deterministically expanded to a 2n-atom W state.
    • The scheme avoids complex requirements like multi-atom gates or quantum non-demolition measurements.

    Conclusions:

    • The proposed scheme offers a simplified and feasible route to generate large-scale atomic W states.
    • This advancement has significant implications for quantum information, communication, and thermodynamics.