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

Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

1.3K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
1.3K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

2.2K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.2K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.4K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.4K
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

4.0K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
4.0K
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

928
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
928
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.4K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.4K

You might also read

Related Articles

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

Sort by
Same author

Spectral collapse in anisotropic two-photon Rabi model.

Scientific reports·2021
Same author

Deciphering the spectral collapse in two-photon Rabi model.

Scientific reports·2021
Same author

Manipulating the spectral collapse in two-photon Rabi model.

Scientific reports·2020
Same author

Demystifying the spectral collapse in two-photon Rabi model.

Scientific reports·2020
Same author

Duplex sonography for detection of deep vein thrombosis of upper extremities: a 13-year experience.

Hong Kong medical journal = Xianggang yi xue za zhi·2015
Same author

A classical simulation of nonlinear Jaynes-Cummings and Rabi models in photonic lattices: comment.

Optics express·2014

Related Experiment Video

Updated: Nov 14, 2025

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
11:45

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

14.9K

Spectral collapse in multiqubit two-photon Rabi model.

C F Lo1

  • 1Institute of Theoretical Physics and Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong. cflo@phy.cuhk.edu.hk.

Scientific Reports
|March 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers found that the critical coupling strength for spectral collapse in N-qubit two-photon Rabi models is significantly reduced (1/N). This makes spectral collapse more achievable and controllable in quantum systems.

More Related Videos

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

9.4K
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

14.8K

Related Experiment Videos

Last Updated: Nov 14, 2025

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
11:45

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

14.9K
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

9.4K
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

14.8K

Area of Science:

  • Quantum physics
  • Atomic, molecular, and optical physics
  • Quantum optics

Background:

  • The N-qubit two-photon Rabi model describes interactions between N qubits and a quantized field.
  • Spectral collapse is a phenomenon where the energy spectrum of a quantum system becomes continuous.

Purpose of the Study:

  • To determine the critical coupling strength for spectral collapse in N-qubit two-photon Rabi models.
  • To analyze the energy spectrum of these systems at the critical coupling.
  • To establish a method for monitoring spectral collapse.

Main Methods:

  • Analytical derivation of critical coupling strength.
  • Rigorous demonstration of spectral properties at critical coupling for two- and three-qubit systems.
  • Mapping the discrete eigenenergy spectrum to a particle-in-a-box model with variable mass and nonlocal potential.

Main Results:

  • The smallest single-qubit critical coupling strength is 1/N times that of the two-photon Rabi model, making spectral collapse more attainable.
  • At critical coupling, the system exhibits both discrete eigenenergies and a continuous energy spectrum.
  • The number of bound states, corresponding to discrete energies, is determined by qubit energy differences and can be monitored.

Conclusions:

  • The N-qubit two-photon Rabi model allows for spectral collapse at more accessible coupling strengths.
  • The system's spectral properties at critical coupling can be mapped to a solvable particle physics problem.
  • The extent of incomplete spectral collapse is controllable and monitorable via qubit energy differences.