How is the partial trace related to the operator sum representation?
122603
How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?
109471
The eigenvectors of the transpose operator
32606
Is the operator $T((x_1,x_2,...,x_n))=(x_1,\frac{x_2}2,\frac{x_3}3,...)$ on $\ell^2$ self-adjoint and unitary
45626
How do I calculate the eigenvalues of the positive partial transpose of this two-qubit state?
54294
Can the product $AB$ be computed using only $+, -,$ and reciprocal operators?
29583
Characterization of the trace function
32611
Is the trace of inverse matrix convex?
90636
Why does the trace show up in such expressions?
147111
Where is the Proof for the Sum-to-Product rule derrived from?
38850
How to show Von Neumann Trace inequality $ \text{Tr}(AB) \leq \sum_{i=1}^n \sigma_{A,i}\sigma_{B,i} $?
61304
Normal ordering of the commutator between annihilation and creation operator
55488
Proving that $\operatorname{codim}(X,Y)=\dim(\mathcal{O}_{X,\eta})$
52774
Computing an infinite sum using the Residue theorem
81088
Understand the shift operator
44281
Proof of sum of kernels of concatenated vector
120820
Why, in spin sums, we sum over final spin states and average over initial states?
54099
What are the eigenvalues of $\operatorname{ad}x$?