Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Density00:56

Density

14.8K
Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
14.8K
Inertia Tensor01:24

Inertia Tensor

474
The concept of the inertia tensor is employed to depict the mass distribution and rotational inertia of a solid or rigid object. This tensor is expressed through a three-by-three matrix. Each component within this matrix corresponds to varying moments of inertia about specific axes.
The diagonal components of the inertia tensor matrix represent the moments of inertia concerning the principal axes of the object. These primary axes are defined as the axes where the object experiences the least...
474
Density and Archimedes' Principle01:05

Density and Archimedes' Principle

6.6K
When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
6.6K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.3K
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
Strain-Energy Density01:20

Strain-Energy Density

411
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
411
Dimensional Analysis01:23

Dimensional Analysis

877
Dimensional analysis is a powerful tool that is used in physics and engineering to understand and predict the behavior of physical systems. The basic idea behind dimensional analysis is to express physical quantities in terms of fundamental dimensions such as the mass, length, and time. Derived dimensions like the velocity, acceleration, and force are derived from the combinations of these fundamental dimensions.
Dimensional analysis allows us to analyze and compare physical quantities on a...
877

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Comparative study of the green-pumped LBO crystal type-I and type-II phase-matched optical parametric oscillator.

Applied optics·2026
Same author

High-energy, 3 ps, 1.5 μm optical parametric conversion based on a periodic KTA crystals array.

Optics letters·2025
Same author

Continuously adjustable-pulse-width electro-optically Q-switched laser with Nd:YVO<sub>4</sub>/Nd:YAG dual crystals.

Optics express·2025
Same author

Preservation of short-term cervical posterior muscle volume and cervical alignment: a comparison between three types of modified muscle-sparing laminoplasty and conventional open-door laminoplasty for multilevel degenerative cervical myelopathy.

BMC musculoskeletal disorders·2025
Same author

A competency-based instructional design: A progressive blended case-based teaching method.

Medicine·2025
Same author

Proteomic profiling reveals distinct inflammatory and neurogenic endotypes in rosacea.

Journal of the American Academy of Dermatology·2025

Related Experiment Video

Updated: Jul 4, 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

9.0K

Resource-Efficient Direct Characterization of General Density Matrix.

Liang Xu1,2,3, Mingti Zhou1,3, Runxia Tao1,3

  • 1College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, 310018, China.

Physical Review Letters
|February 2, 2024
PubMed
Summary

We developed a resource-efficient scheme (RES) for characterizing multiqudit quantum systems. This method directly extracts density-matrix elements, improving efficiency and precision over sequential measurements.

More Related Videos

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

8.4K
Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs
05:00

Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs

Published on: August 9, 2024

1.3K

Related Experiment Videos

Last Updated: Jul 4, 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

9.0K
Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

8.4K
Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs
05:00

Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs

Published on: August 9, 2024

1.3K

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Computing

Background:

  • Sequential weak measurements enable direct extraction of density-matrix elements for quantum system characterization.
  • Extending these schemes to multiqudit systems is difficult due to multiple coupling requirements and precision evaluation challenges.

Purpose of the Study:

  • To propose a resource-efficient scheme (RES) for direct density-matrix characterization of general multiqudit systems.
  • To optimize measurements and establish feasible estimation analysis for multiqudit systems.

Main Methods:

  • Constructing an efficient observable where a single meter state coupled to each qudit extracts density-matrix elements.
  • Utilizing a statistical error distribution model for precision and feasibility evaluation.
  • Experimental application to single-photon qutrit and two-photon entangled states.

Main Results:

  • The RES directly characterizes multiqudit density matrices with optimized measurements and feasible estimation.
  • Experimental results demonstrate the RES outperforms sequential schemes in efficiency and precision.
  • The scheme is effective in both weak- and strong-coupling scenarios.

Conclusions:

  • The proposed RES offers a practical approach for characterizing large-scale quantum systems.
  • This method enhances the investigation of quantum systems' nonclassical properties.
  • The RES provides a more efficient and precise alternative to sequential measurement schemes.