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相关概念视频

Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

632
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...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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.
42.3K
Superconductor01:24

Superconductor

1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.1K
Types Of Superconductors01:28

Types Of Superconductors

983
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Ampere's Law: Problem-Solving01:31

Ampere's Law: Problem-Solving

3.6K
Ampere's law states that for any closed looped path, the line integral of the magnetic field along the path equals the vacuum permeability times the current enclosed in the loop. If the fingers of the right hand curl along the direction of the integration path, the current in the direction of the thumb is considered positive. The current opposite to the thumb direction is considered negative.
Specific steps need to be considered while calculating the symmetric magnetic field distribution...
3.6K
Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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相关实验视频

Updated: Jul 6, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

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使用可编程超导量子比特进行实验量子对抗式学习.

Wenhui Ren1, Weikang Li2, Shibo Xu1

  • 1Department of Physics, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Interdisciplinary Center for Quantum Information, and Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou, China.

Nature computational science
|January 4, 2024
PubMed
概括
此摘要是机器生成的。

量子分类器,就像经典的人工智能一样,容易受到敌对攻击. 这项研究实验性地表明,使用超导量子比特进行量子对抗性学习可以显著提高它们对抗这种干扰的强度.

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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相关实验视频

Last Updated: Jul 6, 2025

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科学领域:

  • 量子计算是一种量子计算.
  • 机器学习 机器学习
  • 人工智能的人工智能

背景情况:

  • 量子计算为机器学习和人工智能提供了潜在的进步.
  • 理论研究表明,与经典深度神经网络相似的量子分类器容易受到对抗性干扰.

研究的目的:

  • 用可编程超导量子比特实验证明量子对抗式学习.
  • 调查量子分类器对抗对抗攻击的稳定性和对抗训练的有效性.

主要方法:

  • 训练有素的量子分类器使用变量量子电路与十个跨子量子比特.
  • 利用具有高平均寿命 (150微秒) 和网关忠实度的超导量子比特 (单量子比特网关的99.94%和双量子比特网关的99.4%).
  • 在现实图像 (如MRI扫描) 和量子数据上测试了分类器.

主要成果:

  • 证明训练有素的量子分类器 (测试准确度高达99%) 可以被小的对抗性扰动所欺骗.
  • 表明对抗训练可以显著提高量子分类器对这些干扰的稳定性.

结论:

  • 量子分类器容易受到对抗性干扰的影响,反映了经典机器学习.
  • 用超导量子比特实现的量子对抗式学习提供了一种可行的方法来提高分类器的稳定性.