Craig Gidney's user avatar
Craig Gidney's user avatar
Craig Gidney's user avatar
Craig Gidney
  • Member for 5 years, 11 months
  • Last seen this week
35 votes
Accepted

An impossible quantum adder claimed by a journal article?

29 votes

Are there emulators for quantum computers?

28 votes

How does a quantum computer do basic math at the hardware level?

25 votes
Accepted

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

25 votes

Can the Bloch sphere be generalized to two qubits?

24 votes
Accepted

Are circuits with more than 1000 gates common?

22 votes
Accepted

Why do the IBM and Google processors both have 53 qubits?

21 votes

How accurate is this figure by TIME magazine?

19 votes

What is the opposite of measurement, in a quantum circuit?

16 votes
Accepted

Why are quantum gates unitary and not special unitary?

14 votes

Is Qiskit more popular than cirq? Why?

13 votes

Are quantum computers just a variant on Analog computers of the 50's & 60's that many have never seen nor used?

13 votes
Accepted

Quantum advantage with only Clifford gates (Gottesman Knill theorem)

12 votes

How to think about the Z gate in a Bloch sphere?

12 votes
Accepted

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

12 votes

What are physically allowed CNOTs for Rigetti's 19 qubit chip and Google's 72 qubit BristleCone chip?

12 votes

The algorithm of the new quantum factoring record 1,099,551,473,989

10 votes
Accepted

Nielsen and Chuang, Exercise 6.5: How to simulate oracle for n+1 qubits using one oracle gate for n qubits and one extra qubit?

10 votes
Accepted

Can a Toffoli gate be implemented using Fredkin gates?

10 votes
Accepted

Approximating unitary matrices

10 votes

How do I check if a gate represented by Unitary $U$ is a Clifford Gate?

10 votes
Accepted

Building a controlled NOT gate which is controlled by the qubit it is acting on

10 votes
Accepted

A necessary and sufficient condition for the existence of a nontrivial square root in Shor's algorithm

9 votes
Accepted

Can we avoid repetition in Shor's algorithm by using the quadratic formula?

9 votes
Accepted

Do quantum loops exist?

9 votes
Accepted

Why do stabilizer codes in Nielsen and Chuang have Pauli X and Z matrices?

9 votes

If two unitary operators commute, do their roots also commute?

9 votes

Is the controlled-Hadamard gate in the Clifford group?

9 votes

What is (formally) a transversal operator?

9 votes

Procedures and intuition for designing simple quantum circuits?

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