Quantum Computing
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forky40
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135 Answers

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14 votes

What are magic states?

9 votes

What is the square root of the NOT gate?

8 votes

How do you represent a Hadamard gate as a product of $R_x$ and $R_y$ gates?

8 votes

How do I transform a $ZZ$ interaction unitary into a $\text{CZ}$ gate?

7 votes

How to apply Euler's formula to $Z$ rotations such as $e^{i\pi/8 Z}$?

7 votes

How to write the three-qubit GHZ state in the Pauli basis?

7 votes
Accepted

Is a "kernel" just the quantum equivalent of classical SVMs?

6 votes

How does the NOT gate generalize beyond binary?

6 votes
Accepted

How can measuring a particle in a GHZ state leave behind a maximally entangled pair?

6 votes
Accepted

What does the quantum part of the quantum support vector machine actually do?

6 votes

Why doesn't the Gottesman-Knill theorem render quantum computing almost useless?

6 votes
Accepted

What is the best way to write a tridiagonal matrix as a linear combination of Pauli matrices?

6 votes
Accepted

Does ${\rm tr}(\Pi \rho) = 1$ imply $\Pi\rho\Pi=\rho$?

6 votes
Accepted

Does a basis of maximally entangled states exist for two-qubit or two-qutrit system so that the density matrices of the basis states don't commute?

6 votes
Accepted

How to calculate the square root of a density matrix?

6 votes
Accepted

What is the difference between Error Mitigation (EM) and Quantum Error Correction (QEC)?

6 votes
Accepted

Swap test vs measurement in a specific basis

5 votes

How to create a quantum circuit with 800+ features using PennyLane

5 votes
Accepted

Depth circuit optimization for 6-qubits GHZ state

5 votes
Accepted

Efficient expectation value of a local operator

5 votes
Accepted

Biggest variance of $h=\sum_i H_i$?

5 votes
Accepted

What does it mean that 1 qubit can do the job of 1 ebit (entanglement bit)? (second Bennett's law)

5 votes
Accepted

Implement the classical shadow coding error?

5 votes
Accepted

Does QFT exploit entanglement?

5 votes

What is the difference between transmon and Xmon qubits?

5 votes
Accepted

Does the quantum Jensen-Shannon divergence appear in any quantum algorithms or texts on quantum computing?

5 votes
Accepted

SWAP Test as a Projective Measurement

5 votes

Finding the norm of a Hamiltonian

5 votes
Accepted

Quantum teleportation of a mixed state through a pure state?

4 votes
Accepted

How is quantum machine learning reversible?

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