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Related Concept Videos

System of Memory01:23

System of Memory

Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...

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Related Experiment Video

Updated: May 13, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Coherent optical memory with high storage efficiency and large fractional delay.

Yi-Hsin Chen1, Meng-Jung Lee, I-Chung Wang

  • 1Department of Physics and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan.

Physical Review Letters
|March 12, 2013
PubMed
Summary

Researchers achieved 78% storage efficiency in a quantum memory for photons using electromagnetically induced transparency. This breakthrough advances quantum communication and optical quantum computation technologies.

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Last Updated: May 13, 2026

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Quantum memory is crucial for quantum communication and computation.
  • Electromagnetically induced transparency (EIT) offers a pathway for optical memory.

Purpose of the Study:

  • To develop a high-efficiency, long-lived quantum memory for photons.
  • To improve storage efficiency and delay in EIT-based optical memory.

Main Methods:

  • Utilized a cold atomic medium to demonstrate quantum memory.
  • Employed electromagnetically induced transparency (EIT) for light pulse storage.
  • Measured storage efficiency, fractional delay, and classical fidelity of recalled pulses.

Main Results:

  • Achieved 78% storage efficiency for light pulses.
  • Recorded a fractional delay of 74 at 50% storage efficiency, a new record.
  • Obtained classical fidelity exceeding 90%, independent of storage time.
  • Confirmed excellent phase coherence between stored and recalled light pulses.

Conclusions:

  • The developed EIT-based optical memory demonstrates significant advancements.
  • The high performance suggests applicability to single photon wave packets.
  • This technology holds promise for long-distance quantum communication and optical quantum computation.