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
9 votes
Accepted

How to intuitively understand why $T$ gate can't be implemented transversally?

9 votes
Accepted

How to check if a $n$-qubit unitary is the tensor product of single-qubit unitaries

9 votes
Accepted

Is effective quantum cloning possible, given that any classical function can be implemented as a quantum circuit?

9 votes
Accepted

What is the complexity of hidden subgroup problems?

9 votes
Accepted

Why does quantum distinguishability ensure no faster-than-light communication?

9 votes
Accepted

Is the Deutsch-Jozsa problem in NP?

9 votes
Accepted

Is it true that if $U$ sends computational basis states to product states, then it sends product states to product states?

8 votes
Accepted

Why do we need Entanglement?

8 votes
Accepted

What unitary commutes with all local Pauli operators?

8 votes
Accepted

Why does the twirl of a quantum channel give a depolarizing channel?

8 votes

Can numbers be factored by using a reverse multiplication circuit on a quantum computer?

8 votes
Accepted

What Hamiltonians generate Hadamard and CNOT matrices?

7 votes
Accepted

Simulate a quantum channel with a certain fidelity

7 votes

CSS Code in disguise

7 votes

Writing state $ |\Psi⟩ =\frac{1}{\sqrt{2}}|00⟩+\frac{i}{\sqrt{2}}|01⟩$ as separate qubits (qiskit textbook)

7 votes
Accepted

What is the control qubit in this 1D ladder of controlled Z gates?

7 votes
Accepted

What does $M_m |\psi_i\rangle$ mean in the equation $p(m|i)=\langle\psi_i|M_m^\dagger M_m|\psi_i\rangle$?

7 votes
Accepted

Does the no-hiding theorem suggest that quantum information is never destroyed?

7 votes

How to construct a controlled-Hadamard gate using single qubit gates and controlled phase-shift?

7 votes
Accepted

Confusion about the output distribution of Haar random quantum states

7 votes
Accepted

How can quantum interference happen in real world if a wave function does not have any physical meaning?

7 votes
Accepted

What's the POVM corresponding to single-qubit state tomography?

7 votes

What is the name for the gate rotating around $Z$ by $\pi/8$?

7 votes
Accepted

How to prove the fundamental equation in the theory of angular momentum $\sum_{l=x,y,z}\langle J_l^2\rangle\le\frac{N(N+2)}{4}$?

7 votes
Accepted

Why can't there be an error detecting code with fewer than 4 qubits?

7 votes
Accepted

How to find the stabilizer generators for a post-measurement state?

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

Schmidt decomposition for tripartite system $ABC$ with vanishing mutual information between $A$ and $C$

7 votes
Accepted

Is there an upper-bound on the operator norm (max-singular value) of the matrix representation of a quantum channel?

7 votes

Why do we need Hilbert spaces when talking about qubits and quantum computation?

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