What does a "pure" state mean in QM?
10856
Differences between pure/mixed/entangled/separable/superposed states
156423
Partition function containing QM?
22842
The Interpretation of $|\psi|^2$ and the No-Clone Theorem
69600
What is the minimum number of separable pure states needed to decompose arbitrary separable states?
156060
When we define the S-matrix, what are "in" and "out" states?
108464
Necessary and sufficient conditions for a function to be the Wigner function of state
33187
Singlet and Triplet states: Why is the $S=0$ state defined as it is?
110888
Quantum states as rays as opposed to vectors
87367
What constitutes an observation/measurement in QM?
145626
Normalisation of free particle wavefunction
43358
What is the quantum mechanical definition of a measurement?
41469
How is quantum superposition different from mixed state?
118026
Energy conservation and quantum measurement
141335
Why there is no operator for time in QM?
154513
Do stationary states with higher energy necessarily have higher position-momentum uncertainty?
35963
Why is the state of a simple compressible system completely specified by two independent intensive properties?
82927
What is "pure energy" in matter-antimatter annihilation made of?