Norbert Schuch's user avatar
Norbert Schuch's user avatar
Norbert Schuch's user avatar
Norbert Schuch
  • Member for 6 years, 1 month
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4 votes

Quantum states are unit vectors... with respect to which norm?

4 votes
Accepted

If a unitary is such that $U|0\rangle=a|0\rangle+b|1\rangle$, what is $U|1\rangle$?

4 votes

Is quantum computing mature enough for a computer scientist with no physics background?

4 votes

How to re-create the following circuit image?

4 votes

Automatic compilation of quantum circuits

4 votes
Accepted

Are all pure entangled states `robust'?

4 votes

Grover's algorithm in a nutshell

4 votes

Quantum computers don't try all the possible solutions, so how does the QFT really work?

4 votes

Is there a separable state that is furthest away from an entangled one?

4 votes
Accepted

Does the trace distance between marginals bound the distance between the overall states?

3 votes
Accepted

Projection is trace-decreasing?

3 votes
Accepted

Why don't qubits continuously rotate in the $z$ direction due to free time evolution?

3 votes

Inequality in overlap of quantum states

3 votes

Given $\rho,\sigma$ such that $F(\rho,\sigma)=0$, what can we say about $F(\text{Tr}_A(\rho),\text{Tr}_B(\sigma))$?

3 votes
Accepted

What is the stabilizer group of a $|W\rangle$ state?

3 votes
Accepted

Calculate probability of a state after depolarization

3 votes

Good metaphors for n-level quantum systems

3 votes

Combining Different Qunits

3 votes

What role does the non-commutativity of the tensor product play in experimental quantum computation?

3 votes

How to decompose 4 qubits Toffoli-gate into two-qubits CNOT gate?

3 votes
Accepted

Why can any LOCC operation be written as $\sum_k (A_k\otimes B_k)\rho(A_k^\dagger\otimes B_k^\dagger)$?

3 votes

What is the relation between POVMs and projective measurements?

3 votes
Accepted

What do entanglement cost and distillable entanglement have to do with measuring entanglement?

3 votes
Accepted

Is there a proof that any pure two-qubit Partially entangled state lies somewhere in between a separable and maximally entangled state?

3 votes

$U_1\oplus U_2$ decomposable into $I\oplus U$ and 1-qubit gates?

3 votes

$U_1\oplus U_2$ decomposable into $I\oplus U$ and 1-qubit gates?

3 votes

conditions for two hermitians operators same up to unitary

3 votes
Accepted

How to prove that the distillable entanglement satisfies $E_D(|\psi_d\rangle\!\langle\psi_d|)\ge \log d$?

3 votes
Accepted

What is the "physical" Hilbert space for non-local Hamiltonians?

3 votes

The complexity of LH with constant gap