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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...
Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Interference and Decay01:16

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Long-Term Memory01:18

Long-Term Memory

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Higher Mental Functions of Brain: Learning and Memory01:26

Higher Mental Functions of Brain: Learning and Memory

Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or playing an...
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Related Experiment Video

Updated: May 14, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Memory attacks on device-independent quantum cryptography.

Jonathan Barrett1, Roger Colbeck, Adrian Kent

  • 1Department of Computer Science, University of Oxford, Wolfson Building, Parks Road, Oxford OX1 3QD, United Kingdom. jonathan.barrett@cs.ox.ac.uk

Physical Review Letters
|February 7, 2013
PubMed
Summary
This summary is machine-generated.

Device-independent quantum cryptography offers security without device verification. However, reusing devices can leak secret data, necessitating new, practical security protocols for quantum key distribution.

Related Experiment Videos

Last Updated: May 14, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Area of Science:

  • Quantum Information Science
  • Cryptography
  • Quantum Computing Security

Background:

  • Device-independent quantum cryptography aims for security based solely on output statistics, bypassing internal device verification.
  • This approach protects against untrusted manufacturers, sabotage, and device degradation, generating significant research interest.
  • Existing device-independent protocols often rely on public communication, posing potential security vulnerabilities.

Purpose of the Study:

  • To identify and address a critical weakness in device-independent quantum cryptographic protocols.
  • To propose practical defenses against information leakage from device reuse.
  • To introduce a new protocol structure for device-independent quantum key distribution (DIQKD) ensuring composable security.

Main Methods:

  • Analysis of information leakage through input/output recording and public communication in device-independent protocols.
  • Development of partial defense strategies against data leakage from reused devices.
  • Design of a novel protocol structure for repeated key sharing in DIQKD.

Main Results:

  • Identified that untrusted devices can record and reveal information via public outputs in subsequent runs, compromising security.
  • Demonstrated that device reuse poses a significant risk of secret data leakage.
  • Proposed practical partial defenses and a new protocol structure for DIQKD.

Conclusions:

  • Device reuse presents a critical, often overlooked, security flaw in current device-independent quantum cryptographic schemes.
  • Securely destroying or isolating devices is often impractical; alternative defenses are needed.
  • The proposed new protocol structure offers a path towards composable security for repeated key sharing in DIQKD.