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Quantum Computing
Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman's user avatar
Adam Zalcman
  • Member for 4 years, 3 months
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413 Answers

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24 votes
Accepted

How can we keep Schrödinger's cat alive?

23 votes
Accepted

How can classical bits be copied if qubits cannot be copied?

21 votes
Accepted

What is a stabilizer state?

16 votes
Accepted

Transversal logical gate for Stabilizer (or at least Steane code)

16 votes
Accepted

Aren't qubits just ternary?

15 votes
Accepted

Are spin-glass problems NP (-complete)?

15 votes
Accepted

What is a "maximally mixed state"?

14 votes
Accepted

What are min and max overlaps of a maximally entangled state with a separable state?

13 votes
Accepted

What is the relation between POVMs and observables (as Hermitian operators)?

13 votes
Accepted

Does anyone know the list of all known universal sets of quantum gates?

13 votes
Accepted

Do there exist problems known to be computationally intractable for quantum computer, but tractable for classical computer?

12 votes

What makes representing qubits in a 3D real vector space possible?

12 votes
Accepted

How to calculate the average fidelity of an amplitude damping channel

12 votes
Accepted

How can one argue that the $S$-gate is Clifford while $T$-gate is not?

12 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?

11 votes
Accepted

CSS codes are the only stabilizer codes with transversal CNOT?

11 votes
Accepted

Inverting the depolarizing channel

11 votes

Why can the most general state of a qubit be written as $|\Psi\rangle=\cos(\frac\theta2)|0\rangle+e^{i\phi}\sin(\frac\theta2)|1\rangle$?

10 votes
Accepted

Can a quantum computer tell whether a program is Turing complete?

10 votes
Accepted

What is the rank of a quantum channel?

10 votes

Quantum advantage with only Clifford gates (Gottesman Knill theorem)

10 votes
Accepted

What are the possible non-entangling two-qubit gates?

10 votes
Accepted

Can we write Pauli-Y gate without even complex part?

10 votes
Accepted

How to distinguish between collapsed and uncertain qubits in a quantum circuit?

10 votes
Accepted

How does the number of copies affect the diamond distance?

10 votes

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

9 votes
Accepted

What unitary commutes with all local Pauli operators?

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?

9 votes
Accepted

What's the 'physical consistency' in the partial trace scenario?

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