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Related Concept Videos

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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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...
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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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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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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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Updated: May 5, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Gradient echo quantum memory in warm atomic vapor.

Olivier Pinel1, Mahdi Hosseini, Ben M Sparkes

  • 1ARC Centre for Quantum Computation and Communication Technology, Department of Quantum Science, The Australian National University.

Journal of Visualized Experiments : Jove
|December 5, 2013
PubMed
Summary
This summary is machine-generated.

Gradient echo memory (GEM) stores optical quantum states in atomic ensembles. This quantum memory technology is crucial for developing quantum repeaters to extend the range of quantum key distribution (QKD).

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Quantum key distribution (QKD) faces transmission distance limitations.
  • Quantum repeaters are necessary to extend QKD range.
  • Quantum repeaters require robust quantum memory systems.

Purpose of the Study:

  • To demonstrate the Gradient Echo Memory (GEM) protocol for storing optical quantum states.
  • To utilize atomic ensembles in a warm gas cell for a simplified quantum memory implementation.
  • To explore in-memory state refinement capabilities of the GEM protocol.

Main Methods:

  • Storing optical quantum states by absorbing light into a rubidium-87 atomic ensemble.
  • Utilizing a magnetic field gradient for state storage and reversal.
  • Employing a warm gas cell setup for the atomic ensemble.

Main Results:

  • Successful storage and recall of optical quantum states using the GEM protocol.
  • Demonstration of in-memory state refinement, including frequency shifting and bandwidth manipulation.
  • Identification and mitigation strategies for potential issues like four-wave mixing.

Conclusions:

  • The Gradient Echo Memory (GEM) protocol offers a simple and versatile method for quantum memory.
  • This approach using rubidium-87 vapor in a warm gas cell is practical for quantum repeater development.
  • GEM technology holds promise for advancing secure long-distance quantum communication.