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GaussStrife
  • Member for 3 years, 9 months
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2 votes
0 answers
33 views

Local operation to change the maximally mixed 2 qubit state to $\frac{1}{2}(|01\rangle \langle01|+|10\rangle \langle10|)$?

6 votes
1 answer
91 views

Prove that $|(\langle \psi|_{A} \otimes \langle \phi|_{B})|\theta\rangle_{AB}|^{2}<1$ for entangled $|\theta\rangle_{AB}$

2 votes
1 answer
31 views

Showing that $S(\rho_{XB}||\sigma_{XB})=\sum_{x}p(x)D(\rho_{B}^{x}||\sigma_{B}^{x})$ for classical-quantum states

6 votes
3 answers
387 views

Interpretation of the unitaries involved in the eigenvalue decomposition of a density operator

2 votes
1 answer
59 views

What can be said about the non-negativity of the relative entropy of $S(\rho_{AB}||\rho_{B})$?

1 vote
0 answers
44 views

How is $I(\rho^{QC})=I_{CC}(\rho^{QC})$

1 vote
1 answer
61 views

Moving between $\sum_{I}E_{i}=I$ and $\sum_{i}M^{\dagger}M=I$ for non-hermitian $M$

2 votes
1 answer
39 views

How does $F(\psi, \phi) = [\sum_{x}\sqrt{p(x)q(x)}]^{2}$ [duplicate]

2 votes
0 answers
62 views

Question regarding bloch vector solutions for master equation on page 388 of N&C

2 votes
2 answers
58 views

How does a $d\times\ell$ matrix of rank $\ell$ and with singular values all equal to 1 imply it is maximally entangled

2 votes
1 answer
80 views

Under what situation is $\sum_{i} p_{i}S(\rho_i)$ > 0

1 vote
1 answer
55 views

Confusion over HSW theorem depicted in Nielsen and Chuang

0 votes
1 answer
53 views

Question regarding part of the proof for the typical subspace theorem

1 vote
1 answer
57 views

Confused regarding explanation of Schumachers compression in N&C

2 votes
2 answers
187 views

Meaning behind obtaining a hermitian operator for measurement in another basis?

5 votes
1 answer
390 views

How can the Holevo bound be used to show that $n$ qubits cannot transmit more than $n$ classical bits?

2 votes
1 answer
82 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 vote
1 answer
87 views

Proof of quantum data processing inequality in N&C on pg 566

2 votes
1 answer
46 views

$N(\frac{1}{2},2)=3$ for vectors in a Hilbert Space

1 vote
2 answers
141 views

How does one go about constructing a mixed entangled state?

3 votes
0 answers
100 views

Circuit to construct a $n$-qubit state which is a superposition of states with only a single qubit being $\lvert1\rangle$ [duplicate]