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rnva's user avatar
rnva's user avatar
rnva
  • Member for 5 years, 5 months
  • Last seen this week
  • USA
6 votes
Accepted

Why is the superposition of all states an eigenvector, with eigenvalue 1, of the QFT?

4 votes

What does quantum gate fidelity mean?

4 votes
Accepted

Prove that Shannon and von Neumann entropies satisfy $H(P)\ge S(\rho)$ with $P$ diagonal of $\rho$

4 votes
Accepted

What is the intuition behind "states with support on orthogonal subspaces"?

3 votes
Accepted

How do I prove that $\newcommand{\tr}{\operatorname{Tr}}\tr(A \sqrt{B} A \sqrt{B}) = \tr\Big[\Big(\sqrt{\sqrt{B}} A \sqrt{\sqrt{B}}\Big)^2\Big]$?

3 votes

Generate a quantum state that sums up all permutations of elements

3 votes

Does entanglement allow enhanced communication efficiency?

3 votes
Accepted

Quasi concavity of max-relative entropy?

3 votes
Accepted

In context of stabilizer codes, are logical gates and Pauli operators the same?

2 votes
Accepted

Prove that the coherent information of an antidegradable channel is equal to zero

2 votes
Accepted

How can one derive the POVM to unambiguously discriminate between $|0\rangle$ and $|+\rangle$?

2 votes
Accepted

Niemark's theorem - simulating POVMs with PVMs

2 votes

How many measurements are needed to distinguish two fixed density matrices?

2 votes

Alternative definition of the coherent information of a quantum channel

1 vote
Accepted

How do I apply a controlled gate to specific qbits in the register?

1 vote

Calculation of the system states and the individual wire states in a quantum circuit

1 vote
Accepted

How to evaluate the mutual information of a classical-quantum state?

1 vote
Accepted

Digitization of errors in QEC

1 vote
Accepted

How does syndrome extraction in bit-flip codes using stabilizers work?

1 vote
Accepted

Increasing quantum channel capacity

-1 votes
Accepted

Measuring probabilities of 0 or 1 in a two qubit state