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Related Concept Videos

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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Electron Behavior01:09

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Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
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Electron Behavior00:54

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Overview
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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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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum delayed-choice experiment with a single neutral atom.

Gang Li, Pengfei Zhang, Tiancai Zhang

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    This study proposes a quantum delayed-choice experiment using a single neutral atom to demonstrate wave-particle duality. Findings show heavy atoms exhibit morphing behavior, crucial for understanding complementarity and advancing quantum information processing.

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    Area of Science:

    • Quantum physics
    • Atomic physics
    • Quantum information science

    Background:

    • Bohr's complementarity principle describes wave-particle duality.
    • Observing this duality in heavy neutral atoms is challenging.
    • Quantum information processing benefits from understanding fundamental quantum behaviors.

    Purpose of the Study:

    • To propose a quantum delayed-choice (QDC) experiment with a single neutral atom.
    • To investigate the wave-like and particle-like behaviors of atoms.
    • To explore the potential of heavy neutral atoms in quantum information.

    Main Methods:

    • Utilizing a Ramsey interferometer with a single neutral atom (e.g., rubidium, cesium).
    • Implementing a quantum-controlled π/2-rotation via Rydberg-Rydberg interaction with an ancilla atom.
    • Observing atomic behavior based on the presence or absence of the second π/2-rotation.

    Main Results:

    • Demonstrates that a single heavy neutral atom can exhibit morphing behavior between wave-like and particle-like states.
    • Confirms the feasibility of a QDC experiment with neutral atoms.
    • Highlights the role of quantum control in manipulating atomic behavior.

    Conclusions:

    • The proposed QDC experiment provides insights into Bohr's complementarity principle for matter-waves and particles.
    • Heavy neutral atoms can be utilized to study fundamental quantum phenomena.
    • This research has significant implications for quantum information processing with neutral atoms.