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Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman
  • Member for 4 years, 1 month
  • Last seen this week
7 votes
Accepted

In the Clifford group, is the center of $ \overline{\text{Cl}_n} \equiv\text{Cl}_n/U(1)$ trivial?

7 votes
Accepted

Is there any simple mathematical proof that measurement destroys entanglement?

7 votes
Accepted

Are nearly all pure two-qubit state entangled?

7 votes
Accepted

Is every single-qubit unitary just a rotation around some unit vector on the Bloch sphere?

7 votes
Accepted

Prove the fidelity can be written in terms of Pauli expectation values as ${\rm tr}(\rho\sigma)=\sum_k \chi_\rho(k)\chi_\sigma(\rho)$

7 votes
Accepted

How to prove that $\frac{| x_0 \rangle + | x_1 \rangle}{\sqrt{2}}$ hides one of $x_0$ or $x_1$?

7 votes

How to describe a known quantum state using classical information?

7 votes
Accepted

Does conjugation by a Clifford send each non-identity Pauli to every other non-identity Pauli with equal frequency?

7 votes
Accepted

Does the controlled Pauli Z gate cause entanglement?

7 votes

Where does Deutsch's algorithm use entanglement?

7 votes
Accepted

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

7 votes
Accepted

What channels preserve the purity of all pure inputs?

7 votes
Accepted

Can we always simultaneously diagonalize $H_A \otimes \mathbb{1}$ and $\mathbb{1} \otimes H_B$?

7 votes
Accepted

How to square a density matrix?

7 votes
Accepted

What is a POVM?

7 votes
Accepted

Parametrization of a two-qubit state

6 votes
Accepted

What is the adjoint of the depolarizing channel?

6 votes
Accepted

Proof that for an $[\![n,k,d]\!]$ code we have $N(S)/S\simeq{\cal G}_k$ with $S$ stabilizer

6 votes
Accepted

How would HSP with $S_N$ work when the automorphism subgroup is (almost) equal to the symmetric group?

6 votes
Accepted

Why is a Bell state involved in quantum teleportation?

6 votes

Are $(|00\rangle-|11\rangle)/\sqrt2$ and $(|11\rangle-|00\rangle)/\sqrt2$ the same quantum state?

6 votes
Accepted

No-cloning theorem and distinguishing between two non-orthogonal quantum states revisited

6 votes
Accepted

Why does a quantum operation being trace-preserving imply that $\sum_k E_k^\dagger E_k=I$?

6 votes
Accepted

How does the spectral decomposition of the Choi operator relate to Kraus operators?

6 votes
Accepted

Getting non-Clifford after performing several Clifford gates in qiskit

6 votes
Accepted

Commutation rules between Pauli $X$ and controlled-Hadamard

6 votes
Accepted

Does phase kickback require the system to be in the eigenstate?

6 votes
Accepted

What is the root of the non-trace-preserving bit-flip map

6 votes
Accepted

What does $ A - \langle A \rangle $ mean?

6 votes
Accepted

Why do we require that the elements of a stabilizer group commute?

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