Related Experiment Video
Updated: Feb 7, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Shannon entropy and avoided crossings in closed and open quantum billiards
Kyu-Won Park1, Songky Moon1, Younghoon Shin1
1School of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.
Abstract:
The relation between Shannon entropy and avoided crossings is investigated in dielectric microcavities. The Shannon entropy of the probability density for eigenfunctions in an open elliptic billiard as well as a closed quadrupole billiard increases as the center of the avoided crossing is approached. These results are opposite to those of atomic physics for electrons. It is found that the collective Lamb shift of the open quantum system and the symmetry breaking in the closed chaotic quantum system have equivalent effects on the Shannon entropy.
Related Concept Videos
Entropy
Entropy
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
Quantum Numbers
Standard Entropy Change for a Reaction
Frustration and Conflict: Avoidance-Avoidance, Double-Approach Avoidance
The Quantum-Mechanical Model of an Atom

