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Related Concept Videos

Weak Base Solutions03:21

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Extraction: Partition and Distribution Coefficients01:14

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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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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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Practical semi-quantum key distribution with one-way key and one basis.

Ke Wang, Xiu-Qing Yang, Ting-Yu Li

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    |December 2, 2023
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    This study introduces a novel one-way semi-quantum key distribution (SQKD) protocol, enhancing security against Trojan horse attacks. The new method uses single photons for encoding and returned photons for security, achieving 110 km key distribution without decoy states.

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    Area of Science:

    • Quantum Information Science
    • Cryptography
    • Quantum Communication

    Background:

    • Existing semi-quantum key distribution (SQKD) protocols require two-way communication.
    • These protocols are vulnerable to Trojan horse side-channel attacks, where an eavesdropper can estimate the key by sending their own photons into the receiver's apparatus.

    Purpose of the Study:

    • To propose a practical, one-way SQKD protocol to enhance security against Trojan horse attacks.
    • To develop a protocol that reduces the security analysis complexity for Trojan horse attacks in SQKD.
    • To ensure security under practical conditions, including source flaws and the use of weak coherent pulses (WCP).

    Main Methods:

    • Encoding bit information using single photons transmitted through a one-way channel.
    • Utilizing returned photons to quantify the eavesdropper's (Eve's) information.
    • Implementing the protocol with a single basis and weak coherent pulses (WCP).

    Main Results:

    • The proposed one-way SQKD protocol effectively reduces the security vulnerability to Trojan horse attacks.
    • The protocol demonstrates security advantages in practical systems, even when considering source flaws.
    • Simulations show successful secret key distribution over 110 km using WCP without the need for decoy states.

    Conclusions:

    • The developed one-way SQKD protocol offers a more secure and practical approach to key distribution.
    • This protocol addresses key vulnerabilities in existing SQKD systems, particularly concerning side-channel attacks.
    • The ability to distribute keys over significant distances without decoy states highlights the protocol's practical potential.