Related Experiment Video
Updated: Jan 3, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.2K
Superradiance in finite quantum systems randomly coupled to continuum.
Pavel Stránský1, Pavel Cejnar1
1Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague, Czech Republic.
Physical Review. E
|November 28, 2019
Summary
Superradiance in open quantum systems is studied, showing enhanced effects near quantum criticality. This phenomenon involves separating short- and long-living states as decay width increases.
Area of Science:
- Quantum physics
- Open quantum systems
- Quantum optics
Background:
- Superradiance describes collective spontaneous emission.
- Open quantum systems interact with their environment.
- Understanding eigenstate behavior is crucial in quantum dynamics.
Purpose of the Study:
- To investigate the superradiance effect in open quantum systems.
- To explore the relationship between decay width and eigenstate separation.
- To determine the influence of quantum criticality on superradiance.
Main Methods:
- Modeling open quantum systems using various Hamiltonians.
- Employing random matrix theory to couple systems to the continuum.
- Analyzing effective non-Hermitian Hamiltonians and their exceptional points.
Main Results:
- Demonstrated the separation of short- and long-living eigenstates with increasing decay width.
- Linked robust superradiance features to the distribution of exceptional points.
- Showcased enhanced superradiance at points of quantum criticality.
Conclusions:
- Superradiance in open quantum systems is strongly influenced by decay width and system criticality.
- Exceptional points play a key role in the dynamics of superradiance.
- Quantum criticality offers a pathway to enhance superradiance phenomena.
Related Concept Videos
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.2K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
1.2K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.4K
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...
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...
1.4K
01:12Fermi Level Dynamics
606
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
606
02:39Emission Spectra
75.3K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
75.3K
02:32The de Broglie Wavelength
32.7K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
32.7K
02:45The Quantum-Mechanical Model of an Atom
56.2K
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.
56.2K