Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman
  • Member for 4 years
  • Last seen this week
4 votes
Accepted

Is it possible to implement the controlled-S gate, such that the inner gate between the CNOTs belongs to the Clifford?

2 votes

A separable pure bipartite quantum state must be a product state

5 votes

What is the relation between the purity of a bipartite state and its subsystems?

7 votes
Accepted

Is the Steane code the only $ [\![7,1,3]\!] $ CSS code?

5 votes

Show that conjugating $\text{CNOT}$ by $H\otimes H$ exchanges control and target qubits

4 votes
Accepted

Prove that if Kraus operators of $\Phi$ form an ONB then $\Phi$ is the replacement map

10 votes

Is there a no-go theorem for or an upper bound on code threshold?

5 votes
Accepted

What are the properties of stabilizer codes that ensure $C(S) = N(S)$?

3 votes
Accepted

Affine transformation of the Bloch sphere to Kraus representation of qubit channels

4 votes

Is there a fast sparse Hadamard transform?

8 votes
Accepted

What unitary commutes with all local Pauli operators?

2 votes
Accepted

What happens to $|y\rangle \sum_{x}|x\rangle|f(x) + g(y)\rangle$ when we throw away the first register?

2 votes

Simplification of a generic quantum state

1 vote
Accepted

Multi-qubit quantum channels in Pauli-Liouville basis: Tensor product of Pauli-Transfer Matrices?

2 votes
Accepted

Process matrix of CNOT gate

5 votes
Accepted

Why does the definition of the oracle in Deutsch's algorithm fail to specify its action on superpositions?

5 votes
Accepted

Which qubit has the highest $|1\rangle$ amplitude?

2 votes

Asymptotic purity from the spectrum of the Choi matrix?

2 votes

Given a quantum state, can you generate a uniform superposition over its computational basis vectors with nonzero amplitudes?

2 votes
Accepted

Explicit examples of non-stabilizer (non-additive) quantum codes with recovery procedure

1 vote
Accepted

Obtaining the reduced density matrices for both subsystems of a bipartite system

2 votes
Accepted

unitary that transforms one Hilbert space to another Hilbert space

1 vote
Accepted

Problem with the mathematical definition of the eigenvalue algorithm on a specific exercise

1 vote
Accepted

Why $\sqrt{\rho} = P \sqrt{\rho}$ in the proof of quantum error correction conditions in Nielsen & Chuang?

2 votes
Accepted

Problem with eigenvalue evaluation algorithm application on matrix $U$

3 votes
Accepted

Is a process matrix of rank $1$ unique?

3 votes

How to characterize the extreme points of the set of CPTP maps?

5 votes
Accepted

When is the square root of a Clifford gate a Clifford gate?

2 votes

What is known about the size of the spectral gap of unital quantum channels?

11 votes
Accepted

If a quantum error correcting code can correct every single-qubit $X$ and $Z$ error, can it also correct every single-qubit $Y$ error?

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