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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...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Quasi-light Storage for Optical Data Packets
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One-hour coherent optical storage in an atomic frequency comb memory.

Yu Ma1,2, You-Zhi Ma1,2, Zong-Quan Zhou3,4

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, PR China.

Nature Communications
|April 23, 2021
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Summary
This summary is machine-generated.

Researchers developed a new solid-state quantum memory capable of storing light for over an hour, overcoming previous limitations for quantum communication. This breakthrough advances the development of long-distance quantum networks.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Optics

Background:

  • Photon loss in optical fibers hinders long-distance quantum information distribution.
  • Current quantum repeater schemes face limitations due to system complexity.
  • Transportable quantum memories and quantum-memory-equipped satellites are alternatives, but require long-lived optical quantum memories.

Purpose of the Study:

  • To overcome the limited storage time of existing optical quantum memories.
  • To enable global quantum communication through the development of long-lived solid-state quantum memories.

Main Methods:

  • Utilized a zero-first-order-Zeeman magnetic field to protect spin coherence.
  • Employed dynamical decoupling techniques for enhanced spin coherence preservation.
  • Demonstrated coherent light storage in an atomic frequency comb memory.

Main Results:

  • Achieved coherent storage of light for over 1 hour in a solid-state memory.
  • Significantly extended the storage duration compared to previous optical memory demonstrations (approx. 1 minute).

Conclusions:

  • Developed a long-lived solid-state quantum memory with potential for global quantum communication.
  • The demonstrated 1-hour storage time is a critical step towards practical quantum networks.