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相关概念视频

The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

552
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
552
Maximum Power Transfer01:16

Maximum Power Transfer

225
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
225
Non-ohmic Devices00:51

Non-ohmic Devices

1.0K
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.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.0K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.0K
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...
1.0K
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

1.4K
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
1.4K
Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

544
A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
544

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相关实验视频

Updated: Jun 5, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
00:07

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

Published on: September 5, 2019

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基于超编码的高容量设备独立量子安全直接通信.

Hui Zeng1, Ming-Ming Du2, Wei Zhong3

  • 1College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

Fundamental research
|December 11, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了使用超编码的高容量设备独立量子安全直接通信 (DI-QSDC) 协议. 它增强了秘密消息的容量,同时保持了基于贝尔不平等违规的安全性,这对未来的DI-QSDC系统至关重要.

关键词:
独立于设备的独立设备.超级编码是一种超级编码.超纠的钟声状态测量测量量子密码学是一种量子密码学.量子安全的直接通信.秘密消息的传输能力是秘密的.

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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

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相关实验视频

Last Updated: Jun 5, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
00:07

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

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

486

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
  • 量子通信是一种量子通信.

背景情况:

  • 量子安全直接通信 (QSDC) 允许在没有预先共享密钥的情况下,通过量子通道直接传输秘密消息.
  • 独立于设备 (DI) 的 QSDC 通过完全依赖贝尔不平等违规,独立于设备特征来提高安全性.
  • 目前的DI-QSDC协议存在限制的秘密消息容量问题.

研究的目的:

  • 提出一种新的高容量DI-QSDC协议.
  • 增加DI-QSDC系统的秘密信息容量.
  • 确保安全是基于基本的量子原理 (贝尔不等式违反).

主要方法:

  • 使用超编码技术开发DI-QSDC协议.
  • 分析总消息泄漏率,仅取决于最强大的自由度.
  • 数字模拟用于评估与通信距离之间的秘密信息容量.

主要成果:

  • 与现有的DI-QSDC方法相比,拟议的协议显示秘密消息容量显著增加.
  • 该协议的安全性强大,依赖于贝尔不等式违规.
  • 模拟显示了秘密消息容量和通信距离之间的关系.

结论:

  • 超编码技术有效地提高了DI-QSDC的容量.
  • 这项工作代表了实用的DI-QSDC系统的重大进步.
  • 该协议为安全量子通信的未来发展提供了一个有希望的方向.