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Craig Gidney
  • Member for 4 years, 5 months
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29 votes

Are there emulators for quantum computers?

24 votes

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

23 votes
Accepted

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

23 votes

Can the Bloch sphere be generalized to two qubits?

22 votes
Accepted

Are circuits with more than 1000 gates common?

19 votes

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

16 votes

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

14 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?

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

11 votes

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

11 votes
Accepted

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

11 votes
Accepted

Quantum advantage with only Clifford gates (Gottesman Knill theorem)

10 votes
Accepted

Can a Toffoli gate be implemented using Fredkin gates?

9 votes
Accepted

Why does measuring one qubit after the other in this entangled system alter the result?

9 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?

9 votes

Why should we use inverse QFT instead of QFT in Shor's algorithm?

9 votes
Accepted

What is the minimum integer value to make quantum factorization to be worthwhile?

9 votes
Accepted

Obtaining gate $e^{-i\Delta t Z}$ from elementary gates

9 votes
Accepted

Is there a classical limit to quantum computing?

9 votes
Accepted

Approximating unitary matrices

9 votes

Procedures and intuition for designing simple quantum circuits?

9 votes

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

9 votes

Is there any difference between "value of a qubit" and its "state"?

9 votes

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

9 votes
Accepted

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

8 votes
Accepted

Why doesn't Shor's algorithm output a solution for some numbers?

8 votes
Accepted

Is the SWAP gate a Clifford Gate? How would I express it using the Clifford Gate generators?

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