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相关概念视频

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.
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
499
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
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Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

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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:
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BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

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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....
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Path Between Thermodynamics States01:21

Path Between Thermodynamics States

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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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相关实验视频

Updated: Jan 8, 2026

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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学习连续变量系统的量子状态.

Francesco A Mele1, Antonio A Mele2, Lennart Bittel2

  • 1NEST, Scuola Normale Superiore and Istituto Nanoscienze, Pisa, Italy.

Nature physics
|December 15, 2025
PubMed
概括
此摘要是机器生成的。

连续变量系统的量子态断层扫描非常低效,需要比量子比特更多的资源. 然而,对于高斯和某些非高斯状态,存在有效的方法.

关键词:
图像和传感的成像和传感.量子信息是一种量子信息.理论物理学的理论物理.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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相关实验视频

Last Updated: Jan 8, 2026

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Published on: May 30, 2014

14.9K
Generation and Coherent Control of Pulsed Quantum Frequency Combs
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科学领域:

  • 量子物理学的量子物理学
  • 量子信息科学是一种量子信息科学.
  • 量子光学就是一个量子光学.

背景情况:

  • 量子测量本质上是概率的,产生关于量子状态的部分信息.
  • 量子状态断层扫描从多次测量中重建一个完整的量子状态描述.
  • 连续变量系统 (例如,玻色子,量子光学) 带来了独特的断层扫描挑战.

研究的目的:

  • 对连续变量系统分析量子态断层扫描的最终性能极限.
  • 为了比较连续变量断层扫描与有限维系统的效率.
  • 确定特定量子状态的高效断层扫描条件和方法.

主要方法:

  • 在量子状态断层学中对资源缩放的理论分析.
  • 为状态重建推导错误界限的推导.
  • 研究高斯和非高斯状态的准备和断层扫描.

主要成果:

  • 与量子比特相比,连续变量系统的断层扫描被发现是极其低效的时间资源.
  • 所需状态副本的数量随着模式的数量呈指数变大,并且随着错误而不利.
  • 有效的断层扫描协议已被证明适用于高斯状态,并且在某些非高斯状态下实验性可行.

结论:

  • 连续变量量子态断层扫描通常是资源密集型的.
  • 高斯状态和特定的非高斯状态提供高效的断层扫描途径.
  • 这些发现影响了依赖状态特征的量子技术的发展.