Why can arbitrary two qubit density matrices be expressed in this form?
158964
How to write a generic density matrix for multi qubit system
8755
Quantum Entanglement - What's the big deal?
113275
How to find the reduced density matrix of a four-qubit system?
26417
Why do we use Hermitian operators in QM?
69600
What is the minimum number of separable pure states needed to decompose arbitrary separable states?
159017
Bohr-Sommerfeld quantization condition from the WKB approximation
24155
State of the art in quantum memory
14867
How to interpret $\langle x|\hat Q|x'\rangle$ for a quantum mechanical operator $\hat Q$?
29174
Trouble with operator-sum representation of a quantum operation
148753
Quantum Stat-Mech Proof of an Inequality for the Partition Function
126425
Consistent, complete, and generalized description of the quantum harmonic oscillator
2451
Minimum Uncertainty Wavefunction derivation
80888
How to derive the CNOT matrix for a 3-qubit system where the control & target qubits are not adjacent?
55691
Are states of a quantum system represented by vectors in a Hilbert space?
90475
Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?
41640
How many classical bits are needed to represent a qubit?
52246
Is it possible Fisher information matrix be indefinite?