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Related Concept Videos

System of Memory01:23

System of Memory

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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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Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
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The Quantum-Mechanical Model of an Atom02:45

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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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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Sensory memory captures information from the environment in its original form for a very brief duration, just long enough to be exposed to visual, auditory, and other senses. This type of memory is detailed and rich but quickly lost unless certain strategies are employed to transfer it into short-term or long-term memory. Sensory information is continuously bombarding the human brain, yet only a small fraction is absorbed, as most of it does not significantly impact daily life. For instance,...
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Quantum Numbers02:43

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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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Updated: Feb 25, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Security enhanced memory for quantum state.

Tetsuya Mukai1

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. mukai.tetsuya@lab.ntt.co.jp.

Scientific Reports
|July 29, 2017
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated a quantum memory with encryption capabilities by scrambling and retrieving quantum phase information. This breakthrough enhances quantum information security, moving beyond theoretical proposals to experimental reality.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Atomic Physics

Background:

  • Quantum information security is crucial for both classical and quantum computing.
  • Quantum storage devices have achieved long coherence times, but experimental encryption remains elusive.
  • Theoretical proposals for quantum bit and quantum memory encryption exist but lack experimental validation.

Purpose of the Study:

  • To experimentally demonstrate a quantum memory with an integrated encryption function.
  • To develop a method for scrambling and retrieving quantum phase information for enhanced security.
  • To advance the practical application of secure quantum information technology.

Main Methods:

  • Utilized two independent Ramsey interferometers on an atomic ensemble.
  • Trapped the atomic ensemble below a persistent supercurrent atom chip.
  • Employed random phase operations in the interferometers to scramble quantum phase, followed by a specific time-delayed pulse to restore it.

Main Results:

  • Successfully demonstrated a quantum memory capable of encrypting and decrypting quantum phase information.
  • Achieved scrambling of recorded quantum phase using a second interferometer pulse.
  • Restored the scrambled quantum phase by applying a precisely timed second interferometer pulse.

Conclusions:

  • The experimental demonstration of quantum memory encryption is a significant step forward.
  • This technique provides a viable method for enhancing the security of quantum information.
  • The developed technique paves the way for more secure quantum information technologies.