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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5 votes
Accepted

How is it not a contradiction that it is possible to build fault tolerant circuits with strictly contractive (e.g.: depolarizing noise) channels?

5 votes

What integers have been factored with Shor's algorithm?

5 votes

How to implement the "Square root of Swap gate" on the IBM Q (composer)?

5 votes

Markov Chain expressed in Density Matrix formalism

5 votes
Accepted

Density operators and separable states

5 votes
Accepted

Intuitive role of the polar decomposition in proof of Uhlmann's theorem for fidelity

5 votes

How to describe, or encode, the input vector x of Quantum Fourier Transform?

5 votes
Accepted

Shared entanglement to copy orthogonal states

5 votes

Is the set of classical-quantum states convex?

5 votes

Is that possible to simulate Grover's algorithm in quadratic time?

5 votes
Accepted

How to factor $N=14$ with Shor's algorithm?

5 votes

Generally speaking, are quantum speedups always due to parallelization of a given problem?

5 votes
Accepted

How can I fit an unknown quantum channel?

5 votes
Accepted

Unknown quantum circuit symbol

4 votes

Is the column vector of a uniformly sampled random unitary matrix a uniformly sampled random state vector?

4 votes
Accepted

Lieb-Robinson Bound in 2nd quantized description?

4 votes

If Alice and Bob share only classical communication resources, is shared entanglement always equivalent to shared randomness?

4 votes

In Stinespring dilation, can we always use a mixed state as the ancilla?

4 votes
Accepted

Why are entanglement breaking channels, defined as $\Phi(\rho)=\sum_a \operatorname{Tr}(\mu(a)\rho)\sigma_a$, entanglement breaking?

4 votes

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

4 votes

Is verifying the solution to a QMA-complete problem efficient?

4 votes
Accepted

Does proximity of two bipartite states in a norm force high overlap between the elements of the Schmidt bases?

4 votes

Can you decompose a 4-qubit Toffoli gate (CCCX) into basic gates without an ancillary state?

4 votes

Do stabilizer operations map stabilizer states to stabilizer states?

4 votes
Accepted

Is purity an entanglement witness?

4 votes

Why are all Rényi entropies equal for Clifford dynamics?

4 votes
Accepted

Phase kickback without controlled operator

4 votes
Accepted

How many free real parameters in a general CPTP map?

4 votes
Accepted

All unitary errors are correctable

4 votes

Clarification needed: "Simulation" of $e^{-iHt}$ and its time complexity