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Related Concept Videos

State Space Representation01:27

State Space Representation

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...
State Space to Transfer Function01:21

State Space to Transfer Function

The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
Transfer Function to State Space01:23

Transfer Function to State Space

State-space representation is a powerful tool for simulating physical systems on digital computers, necessitating the conversion of the transfer function into state-space form. Consider an nth-order linear differential equation with constant coefficients, like those encountered in an RLC circuit. The state variables are selected as the output and its n−1 derivatives. Differentiating these variables and substituting them back into the original equation produces the state equations.
In an RLC...
Variables and Equations of State01:27

Variables and Equations of State

The physical state of a pure substance can be defined by certain state variables such as volume (V), pressure (p), temperature (T), and amount of substance (n). When two gases are separated by a movable wall, the gas with the higher pressure naturally compresses the gas with the lower pressure. This causes the high-pressure gas to expand and the low-pressure gas to compress until both gases achieve mechanical equilibrium. At this point, their pressures equalize, and the movement of the wall...
Cartesian Form for Vector Formulation01:26

Cartesian Form for Vector Formulation

The Cartesian form for vector formulation is a process to calculate  the moment of force using the position and force vectors. The moment of force is defined as the cross-product of these vectors, making it a vector quantity. The Cartesian form of the position and force vectors involves unit vectors, which can be used to express the cross-product in determinant form.
The Entropy as a State Function01:14

The Entropy as a State Function

Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...

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Related Experiment Video

Updated: Jul 7, 2026

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

Explicit state vector for Torres-Vega-Frederick phase space representation and its statistical behavior.

Li-yun Hu1, Hong-yi Fan, Hai-liang Lu

  • 1Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China. hlyun@sjtu.edu.cn

The Journal of Chemical Physics
|February 13, 2008
PubMed
Summary
This summary is machine-generated.

We derived the explicit state vector for the Torres-Vega-Frederick phase space representation, denoted by Gamma. This representation exhibits statistical behavior and demonstrates a minimum uncertainty relation, identifying it as a coherent squeezed state.

Related Experiment Videos

Last Updated: Jul 7, 2026

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

Area of Science:

  • Quantum mechanics
  • Quantum optics
  • Chemical physics

Background:

  • The Torres-Vega-Frederick phase space representation offers a unique framework for describing quantum states.
  • Understanding the properties of this representation is crucial for advancing quantum mechanics and its applications.

Purpose of the Study:

  • To derive the explicit state vector for the Torres-Vega-Frederick phase space representation.
  • To analyze the statistical behavior and uncertainty relations within this representation.

Main Methods:

  • Derivation of the explicit state vector (Gamma).
  • Analysis of the Weyl ordered form of Gamma Gamma.
  • Demonstration of the minimum uncertainty relation for mid R:Gamma.

Main Results:

  • The explicit state vector for the Torres-Vega-Frederick phase space representation has been successfully derived.
  • The Weyl ordered form of Gamma Gamma reveals statistical properties of the marginal distribution.
  • The minimum uncertainty relation for mid R:Gamma confirms the state as a coherent squeezed state.

Conclusions:

  • The derived state vector provides a complete and nonorthogonal representation.
  • The findings offer insights into the statistical behavior and quantum properties of this phase space representation.
  • The identification as a coherent squeezed state has implications for quantum information and quantum optics.