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相关概念视频

Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

1.6K
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.
For extracting a solute from an aqueous phase into an...
1.6K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
965
Discrete-time Fourier transform01:26

Discrete-time Fourier transform

237
The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...
237
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

310
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....
310
Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

10.7K
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
 
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
10.7K
Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

615
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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相关实验视频

Updated: May 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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离散调制的连贯状态量子密钥分布与基础编码.

Mingxuan Guo1, Peng Huang1,2,3, Le Huang1

  • 1State Key Laboratory of Photonics and Communications, Institute for Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China.

Research (Washington, D.C.)
|May 15, 2025
PubMed
概括
此摘要是机器生成的。

我们引入了一种新的量子密钥分布协议,即离散调制连贯状态基础编码量子密钥分布 (DMCS-BE-QKD),它显著提高了对通道损失和噪声的耐受性. 这一进步提高了在具有挑战性的环境中安全的通信.

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

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相关实验视频

Last Updated: May 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

8.9K
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

Published on: May 30, 2014

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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科学领域:

  • 量子信息科学 量子信息科学
  • 量子密码学 量子密码学
  • 光学通讯是指光学通讯.

背景情况:

  • 传统的离散调制连贯状态连续变量量子密钥分布 (DMCS-CVQKD) 与高频道噪声和损失作斗争.
  • 现有的DMCS-CVQKD协议在纠错方面存在困难,并且不如高斯模块化方案那么强大.

研究的目的:

  • 提出一种新的量子密钥分配协议,即离散调制的连贯状态基础编码量子密钥分配 (DMCS-BE-QKD).
  • 提高量子密钥分发系统对道损失和过量噪声的耐受性.
  • 简化量子密钥分布中的错误纠正机制.

主要方法:

  • 在两个离散调制连贯状态的随机选择的两个测量基 (X和P的并列方程) 中编码秘密密钥.
  • 分析DMCS-BE-QKD协议的秘密密钥率在线性高斯通道中的个人和集体攻击下.
  • 在50.5公里的光纤上进行一项原理证明实验.

主要成果:

  • 与原来的DMCS-CVQKD相比,DMCS-BE-QKD协议显示了对通道损失和过量噪声的显著增强的耐受性.
  • 新协议可以比原来的DMCS-CVQKD承受大约40dB的频道损失,以实现现实的噪声水平.
  • 实验验证证了DMCS-BE-QKD在50.5公里光纤上的可行性.

结论:

  • 对于量子密钥分配系统来说,DMCS-BE-QKD在稳定性方面提供了显著的改进.
  • 该协议与现有的DMCS-CVQKD基础设施的兼容性有助于其实际部署.
  • 在苛刻的环境中,DMCS-BE-QKD作为安全量子加密的有价值的乘数.