GaussStrife
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3 answers
6 votes
318 views
2 bookmarks
Interpretation of the unitaries involved in the eigenvalue decomposition of a density operator
1 answers
5 votes
290 views
4 bookmarks
How can the Holevo bound be used to show that $n$ qubits cannot transmit more than $n$ classical bits?
2 answers
1 votes
131 views
How does one go about constructing a mixed entangled state?
2 answers
2 votes
119 views
1 bookmarks
Meaning behind obtaining a hermitian operator for measurement in another basis?
0 answers
3 votes
95 views
Circuit to construct a $n$-qubit state which is a superposition of states with only a single qubit being $\lvert1\rangle$
1 answers
1 votes
82 views
Proof of quantum data processing inequality in N&C on pg 566
1 answers
2 votes
78 views
How is $S(\rho)=H(p_{i})+\sum_{i}p_{i}S(\rho_{i})\le \log(d)$ possible if $\rho_{i}$ are not pure states?
1 answers
2 votes
77 views
Under what situation is $\sum_{i} p_{i}S(\rho_i)$ > 0
1 answers
5 votes
76 views
Prove that $|(\langle \psi|_{A} \otimes \langle \phi|_{B})|\theta\rangle_{AB}|^{2}<1$ for entangled $|\theta\rangle_{AB}$
2 answers
2 votes
56 views
How does a $d\times\ell$ matrix of rank $\ell$ and with singular values all equal to 1 imply it is maximally entangled
1 answers
1 votes
56 views
Confused regarding explanation of Schumachers compression in N&C
1 answers
1 votes
56 views
Moving between $\sum_{I}E_{i}=I$ and $\sum_{i}M^{\dagger}M=I$ for non-hermitian $M$
1 answers
2 votes
54 views
What can be said about the non-negativity of the relative entropy of $S(\rho_{AB}||\rho_{B})$?
1 answers
0 votes
51 views
Question regarding part of the proof for the typical subspace theorem
0 answers
1 votes
50 views
Question regarding bloch vector solutions for master equation on page 388 of N&C
1 answers
1 votes
49 views
Confusion over HSW theorem depicted in Nielsen and Chuang
1 answers
2 votes
43 views
1 bookmarks
$N(\frac{1}{2},2)=3$ for vectors in a Hilbert Space
0 answers
1 votes
42 views
How is $I(\rho^{QC})=I_{CC}(\rho^{QC})$
1 answers
2 votes
38 views
How does $F(\psi, \phi) = [\sum_{x}\sqrt{p(x)q(x)}]^{2}$
1 answers
2 votes
28 views
1 bookmarks
Showing that $S(\rho_{XB}||\sigma_{XB})=\sum_{x}p(x)D(\rho_{B}^{x}||\sigma_{B}^{x})$ for classical-quantum states