Prove that qubits can be represented on a unit sphere, avoiding the density matrix formalism
104728
Understanding the Bloch sphere
70281
Why does non-commutativity in quantum mechanics require us to use Hilbert spaces?
108657
Cross product of the quantum mechanical operators $\textbf{p}$ and $\textbf{A}$
87962
Why is $\langle \textbf R \rangle =Tr \rho R$ here $\rho$ is the state density matrix
64958
Understanding quantum entanglement.. help me validate this analogy!
151721
Uhlmann's Theorem: proof of $\text{tr}(A^{\dagger} B) = \langle m | A \otimes B |m\rangle $
148541
Quantization of a particle on a spherical surface
24155
State of the art in quantum memory
43842
Negative probabilities in quantum physics
59067
How to prove that if the expectation value of $A$ in any state is real, then $A$ is Hermitian?
61924
Hilbert space in quantum mechanics
64284
Heisenberg uncertainty principle: a proof for a beginner
108464
Necessary and sufficient conditions for a function to be the Wigner function of state
121446
How to measure a qubit Hamiltonian in qiskit
94844
Unitary map between sets of vectors
92548
Creating an arbitrary state of the quantum simple harmonic oscillator
41470
Is the density operator a mathematical convenience or a 'fundamental' aspect of quantum mechanics?