How to properly find the spectrum of the Quantum Harmonic Oscillator?
65890
Proof that energy states of a harmonic oscillator given by ladder operator include all states
67344
What is spectrum for Laplacian in $\mathbb{R}^n$?
54197
Why are the energy levels of a simple harmonic oscillator equally spaced?
25641
Is there a direct physical interpretation for the complex wavefunction?
14166
Hilbert space of harmonic oscillator: Countable vs uncountable?
49090
How can I find the $\theta$ and $\phi$ values of a qubit on the Bloch sphere?
54099
What are the eigenvalues of $\operatorname{ad}x$?
154772
The Momentum Operator in QM
47173
Half-integer eigenvalues of orbital angular momentum
41407
How to derive or justify the expressions of momentum operator and energy operator?
128932
Is my expansion of the state $| x \rangle$ correct?
10587
Bound states of the $V(x)=\pm \delta'^{(n)}(x)$ potential?
61924
Hilbert space in quantum mechanics
124703
Where does the $i$ come from in the Schrödinger equation?
83220
If $U$ is unitary operator then spectrum $\sigma(U)$ is contained inside the unit circle
117387
Can we safely assume $\Psi(x,t) = \psi(x)e^{-i\omega t}$ always in QM?
51392
What does it mean to Fourier transform a ladder operator (in the input-output formalism)?