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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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. Schrödinger...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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 energy to a nearby...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
Quantum Numbers02:43

Quantum Numbers

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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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum teleportation between remote atomic-ensemble quantum memories.

Xiao-Hui Bao1, Xiao-Fan Xu, Che-Ming Li

  • 1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.

Proceedings of the National Academy of Sciences of the United States of America
|November 13, 2012
PubMed
Summary
This summary is machine-generated.

Researchers achieved quantum teleportation between two remote atomic-ensemble quantum memory nodes. This breakthrough utilized distributed entanglement and quantum memory, paving the way for robust quantum networks and distributed quantum computing.

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Atomic Physics

Background:

  • Quantum teleportation and quantum memory are vital for building large-scale quantum networks.
  • Quantum teleportation transfers quantum states without physical carriers, using distributed entanglement as a quantum channel.
  • Quantum memory stores and retrieves photonic quantum bits using stationary matter systems, enabling network scalability.

Purpose of the Study:

  • To demonstrate quantum teleportation between two remote atomic-ensemble quantum memory nodes.
  • To integrate quantum teleportation and quantum memory for enhanced quantum information transfer.
  • To explore the potential for quantum networks and distributed quantum computing.

Main Methods:

  • Utilized two remote atomic-ensemble quantum memory nodes, each with approximately 10^8 rubidium atoms.
  • Connected the nodes via a 150-meter optical fiber.
  • Mapped the spin wave state of one atomic ensemble to a photon, performing Bell state measurements with an entangled photon from the other ensemble.

Main Results:

  • Successfully realized quantum teleportation between the two remote quantum memory nodes.
  • Achieved an average fidelity of 88(7)% for the teleportation process, heralded by two-photon detection events.
  • Demonstrated a method for quantum information transfer between distant macroscopic objects.

Conclusions:

  • The developed technique successfully integrates quantum teleportation and quantum memory between remote nodes.
  • This work represents a significant step towards building scalable quantum networks and enabling distributed quantum computing.
  • The approach offers a promising solution for reliable quantum information transfer in future quantum communication systems.