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

Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

3.3K
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.
3.3K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

5.0K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
5.0K
Properties of Continuous Functions01:29

Properties of Continuous Functions

211
Continuous functions exhibit smooth, uninterrupted behavior, and combining them through standard operations retains this continuity. If f and g are continuous at a point a, then the functions f+g, f-g, cf (where c is a constant), fg, and fg (provided g(a)a) are also continuous at a. This allows the construction of complex functions from simpler continuous parts without losing smoothness.Polynomials, which are expressions formed by sums of powers of x with constant coefficients, are continuous...
211
Path Between Thermodynamics States01:21

Path Between Thermodynamics States

4.2K
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
4.2K
Standard Entropy Change for a Reaction03:00

Standard Entropy Change for a Reaction

25.3K
Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
25.3K
Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

6.0K
The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
6.0K

You might also read

Related Articles

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

Sort by
Same author

A First-Principles Thermodynamic Uncertainty Relation for Shortcuts to Adiabaticity.

Entropy (Basel, Switzerland)·2026
Same author

Repeater-Based Quantum Communication Protocol: Maximizing Teleportation Fidelity with Minimal Entanglement.

Physical review letters·2025
Same author

Quantum Advantage: A Single Qubit's Experimental Edge in Classical Data Storage.

Physical review letters·2024
Same author

Every Quantum Helps: Operational Advantage of Quantum Resources beyond Convexity.

Physical review letters·2024
Same author

Thermodynamic precision in the nonequilibrium exchange scenario.

Physical review. E·2024
Same author

Battery Capacity of Energy-Storing Quantum Systems.

Physical review letters·2023
Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026
Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026
Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026
Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026
Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026
Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
See all related articles

Related Experiment Video

Updated: Feb 24, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

9.0K

Ergotropic Characterization of Continuous-Variable Entanglement.

Beatriz Polo-Rodríguez1, Federico Centrone1,2, Gerardo Adesso3

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Avinguda Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain.

Physical Review Letters
|February 22, 2026
PubMed
Summary
This summary is machine-generated.

We introduce a new method using ergotropy, a measure of extractable work, to detect entanglement in quantum systems. This ergotropy-based criterion offers an alternative to entropy measures for understanding quantum correlations in optical platforms.

More Related Videos

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

15.1K
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

9.8K

Related Experiment Videos

Last Updated: Feb 24, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

9.0K
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

15.1K
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

9.8K

Area of Science:

  • Quantum Physics
  • Thermodynamics
  • Quantum Information Science

Background:

  • Continuous-variable quantum thermodynamics in the Gaussian regime explores quantum correlations in optical systems.
  • Ergotropy, the maximum extractable work via unitary operations, is a key thermodynamic quantity.

Purpose of the Study:

  • To introduce an entropy-free criterion for entanglement detection in bipartite Gaussian states.
  • To establish a direct operational link between entanglement and energy storage.

Main Methods:

  • Defining the "relative ergotropic gap" to quantify the disparity between global and local ergotropy.
  • Deriving two independent analytical bounds to distinguish entangled from separable states.
  • Extending the analysis to certain non-Gaussian states.

Main Results:

  • Developed an ergotropy-based criterion for entanglement detection, free from entropy measures.
  • Derived bounds that are necessary and sufficient for a broad class of quantum states.
  • Observed that Gaussian ergotropy reflects thermodynamic signatures in entangled non-Gaussian states.

Conclusions:

  • The ergotropic approach captures different aspects of quantum correlations compared to entropy-based measures.
  • This method provides an experimentally accessible approach to entanglement detection in continuous-variable optical platforms.
  • Established a direct link between entanglement and energy storage in quantum systems.