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関連する概念動画

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.8K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
6.1K
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

953
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
953
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.7K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Continuous Charge Distributions01:17

Continuous Charge Distributions

8.5K
Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
8.5K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

820
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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関連する実験動画

Updated: Feb 21, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

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高速極化干渉下での連続変数量子鍵分布のためのアダプティブサインCMA.

Si Qiu, Yan Tian, Shaobo Ren

    Optics express
    |February 20, 2026
    PubMed
    まとめ

    この研究では,光ファイバーにおける偏振乱と戦うために,適応的サイン恒定モジュールアルゴリズム (AS-CMA) を導入しています. 新しい方法は,極端な条件下でも,量子通信のための堅固な極化回復を保証します.

    科学分野:

    • 光学とフォトニック
    • 量子情報科学とは,量子情報科学である.
    • 電気通信エンジニアリング

    背景:

    • 遠距離単一モード光ファイバーケーブルにおける極化変動は,古典的および量子的通信システムを混乱させます.
    • 信号の完全性を維持することは,特に量子鍵分布 (QKD) で,安全なデータ伝送に不可欠です.

    研究 の 目的:

    • 光ファイバーシステムにおける極化回復のための効率的かつ低複雑性アルゴリズムを開発する.
    • 極化干渉に対する連続変数量子鍵分布 (CV-QKD) システムの性能と回復力を向上させる.

    主な方法:

    • エラー駆動型アダプティブステップサイズのアダプティブサインコンスタントモジュールアルゴリズム (AS-CMA) を提案する.
    • 従来のCMAと比較して計算の複雑さを減らすために,サインベースの重量アップデートメカニズムを実装します.
    • シミュレーションされた連続変数量子鍵分布 (CV-QKD) システム内でAS-CMAアルゴリズムの検証.

    主要な成果:

    • AS-CMAは,シミュレートされた偏振干渉速度で25kmのシングルモードファイバーで最大10Mrad/sの強固な偏振回復を示し,秘密キー速度は12.9%しか低下しなかった.
    • アルゴリズムは,43 Mrad/sの極端な一時的な乱れ下でも,雷の発生をシミュレートして,ポジティブな秘密キーレートを維持しました.

    さらに関連する動画

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

    Published on: February 28, 2016

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    関連する実験動画

    Last Updated: Feb 21, 2026

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

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    Published on: September 5, 2019

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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  • 従来のCMA方法と比較して,コンピューティングの複雑性が著しく減少しました.

    • 結論:

    • AS-CMAは,CV-QKDシステムにおける偏振回復のための効率的で計算上安価なソリューションを提供します.
    • このアルゴリズムは,長距離の光ファイバーリンクで動作する量子通信ネットワークの信頼性とセキュリティを強化します.
    • AS-CMAは,将来のセキュアな通信インフラストラクチャの実践的な実装に希望を示しています.