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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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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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Atomic Nuclei: Nuclear Spin01:08

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Atomic Orbitals02:44

Atomic Orbitals

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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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The Pauli Exclusion Principle03:06

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Topologically Protected Quantum Coherence in a Superatom.

Wei Nie1,2, Z H Peng3, Franco Nori4,5

  • 1Institute of Microelectronics, Tsinghua University, Beijing 100084, China.

Physical Review Letters
|February 1, 2020
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Summary
This summary is machine-generated.

We explored topological quantum states in atom arrays, finding robust quantum coherence in edge states. This coherence enables a superradiance-subradiance transition, paving the way for topologically protected quantum memory.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Quantum Information Science

Background:

  • Topological quantum states offer unique properties for quantum technologies.
  • Understanding topological matter is crucial for advancing quantum science.
  • Atom arrays provide a versatile platform for exploring topological phenomena.

Purpose of the Study:

  • To theoretically investigate a quasi-one-dimensional topological atom array.
  • To study the interaction between light and topological quantum states in a driven superatom.
  • To explore the potential of these states for quantum memory applications.

Main Methods:

  • Theoretical modeling of a quasi-one-dimensional topological atom array.
  • Analysis of the low-energy effective model as a topological superatom.
  • Simulation of light-matter interaction within a cavity.
  • Characterization of quantum coherence via photon transmission.

Main Results:

  • Edge states exhibit topology-protected quantum coherence.
  • A superradiance-subradiance transition was identified and its scaling behavior studied.
  • The subradiant edge state's quantum coherence is robust against random noise.
  • The system demonstrates potential for topologically protected quantum memory.

Conclusions:

  • Topological atom arrays can host robust quantum coherence.
  • The observed phenomena have implications for quantum computation and quantum optics.
  • The study suggests experimental realization using circuit QED.