research
21 Jan 2026
14 min read
Coherent States
There are several distinct definitions and constructions of coherent states in the literature, each with its own mathematical formulation, phy...
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research
08 Jan 2026
6 min read
Quantum Information: NonG Measure
The non-Gaussianity (nonG) of a continuous-variable (CV) quantum state $ \rho $ is defined as the quantum relative entropy distance between $ ...
research
08 Jan 2026
2 min read
Quantum Information: Weigner Non-Gaussianity Measure
A celebrated phase-space description of nonclassicality in single-mode quantum oscillators is based on the presence of negative regions of the...
research
14 Dec 2025
13 min read
Contour Integration
The basic idea of contour integration is to extend the concept of integration from the real line to the complex plane. Instead of integrating ...
research
12 Dec 2025
9 min read
Quantum Mechanics in Momentum Space by M Lieber
By M. Lieber Received 18 June 1974
research
03 Dec 2025
18 min read
Fock
On the Theory of the Hydrogen Atom by V. Fock, Leningrad (Received August 5, 1935)
research
03 Dec 2025
15 min read
Fock-German
Theory of the Hydrogen Atom
bsc-v
28 Jul 2025
6 min read
Three-Dimensional Free Particle, Box, Rigid Rotator, and Hydrogen Ground State
Free particle in three dimensions
bsc-v
27 Jul 2025
5 min read
Linear Harmonic Oscillator in One and Three Dimensions
One-dimensional harmonic oscillator
bsc-v
26 Jul 2025
6 min read
Boundary Conditions, Rigid-Wall Box, and Square Wells
The stationary one-dimensional Schrödinger equation is
