Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Quantum Numbers

Quantum Numbers

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.

Second Uniqueness Theorem

Second Uniqueness Theorem

Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the...

Hückel's Rule Diagram of π MOs: Frost Circle

Hückel's Rule Diagram of π MOs: Frost Circle

The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so...

The Pauli Exclusion Principle

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:

¹H NMR: Interpreting Distorted and Overlapping Signals

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...

Stability of Equilibrium Configuration

Stability of Equilibrium Configuration

Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...

You might also read

Related Articles

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

Sort by

Same author

Critical quantum metrology robust against dissipation and nonadiabaticity.

Science advances·2026

Same author

Beating the break-even point with a discrete-variable-encoded logical qubit.

Nature·2023

Same author

Effect of Mo on Microstructures and Wear Properties of In Situ Synthesized Ti(C,N)/Ni-Based Composite Coatings by Laser Cladding.

Materials (Basel, Switzerland)·2017

Same author

Brain Membrane Proteome and Phosphoproteome Reveal Molecular Basis Associating with Nursing and Foraging Behaviors of Honeybee Workers.

Journal of proteome research·2017

Same author

A pairwise likelihood augmented Cox estimator for left-truncated data.

Biometrics·2017

Same author

Novel Three-Dimensional Semiconducting Materials Based on Hybrid d<sup>10</sup> Transition Metal Halogenides as Visible Light-Driven Photocatalysts.

Inorganic chemistry·2017

Search research articles

Related Experiment Video

Updated: Jun 6, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Measuring topological invariants for higher-order exceptional points in quantum three-mode systems.

Pei-Rong Han^1,2, Wen Ning¹, Xin-Jie Huang¹

¹Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou, China.

Nature Communications

|November 28, 2024

Summary

Researchers explored higher-order exceptional points (EPs) in quantum systems. They experimentally demonstrated a third-order exceptional point (EP3) in a non-Hermitian system, revealing multipartite entangled eigenstates and quantum correlations.

More Related Videos

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

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

Published on: August 2, 2019

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

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

Published on: May 30, 2014

Related Experiment Videos

Last Updated: Jun 6, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

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

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

Published on: August 2, 2019

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

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

Published on: May 30, 2014

Area of Science:

Quantum physics
Non-Hermitian systems
Topological phenomena

Background:

Non-Hermitian systems exhibit unique topological phenomena linked to exceptional points (EPs).
Experimental studies of topological invariants in EPs have been limited to second-order EPs (EP2s) in classical or semiclassical systems.

Purpose of the Study:

To propose and experimentally realize a non-Hermitian multi-mode system featuring higher-order EPs.
To investigate the topological invariants associated with these higher-order EPs in a quantum mechanical context.
To explore the nature of multipartite entangled eigenstates underlying these phenomena.

Main Methods:

Implementation of a non-Hermitian model using a Josephson-junction-based electronic mode coupled to two microwave resonators.
Experimental quantification of the topological invariant for a third-order exceptional point (EP3).
Mapping of complex eigenspectra around the EP3 in parameter space.

Main Results:

Successful realization of a non-Hermitian system with higher-order EPs.
Experimental quantification of the topological invariant for an EP3.
Observation of multipartite entangled eigenstates and quantum correlations, confirming nonclassical topology.

Conclusions:

The study extends the understanding of exceptional topology to fully quantum-mechanical models.
Demonstrates the feasibility of characterizing higher-order EPs and their associated topological invariants in quantum systems.
Highlights the role of multipartite entanglement in non-Hermitian topological phenomena.