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KAJ226's user avatar
KAJ226's user avatar
KAJ226
  • Member for 4 years, 4 months
  • Last seen this week
24 votes
Accepted

What's meant by the depth of a quantum circuit?

14 votes

Does control and target matter in the CZ (Controlled-Z) Gate?

10 votes

What is the complexity of estimating the expectation value of an observable?

10 votes

Why 2 $H$ gates in series create a probability of 100% for one value of the qubit and 0% of the second value of the qubit?

10 votes
Accepted

What is the probability of finding the second qubit as $0$ in the state $|\psi\rangle=\frac1{\sqrt2}|00\rangle+\frac12|10\rangle-\frac12|11\rangle $?

9 votes
Accepted

Is there a way to create a superposition of all the possible states?

9 votes
Accepted

How do I apply the Hadamard gate to one qubit in a two-qubit pure state?

9 votes
Accepted

Can I understand mixed states using the Bloch sphere?

9 votes

How to check if a quantum circuit can be constructed for a given matrix representation?

8 votes
Accepted

How to show that Bell states are orthonormal

8 votes
Accepted

Quantum Circuit for $e^{iAt}$ Hamiltonian Simulation in HHL algorithm

8 votes

Why isn't output of Deutsch–Jozsa Algorithm simply $|0\rangle$?

8 votes

Why do quantum gates have to be unitary?

7 votes
Accepted

What is this circuit doing?

7 votes
Accepted

Why is the Bloch sphere three-dimensional?

7 votes
Accepted

VQE - How to get from expectation value to eigenvalue?

7 votes

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

7 votes
Accepted

Does a CNOT quantum gate violate no cloning theorem?

7 votes

How to create the state $\vert 0 \rangle+i \vert 1 \rangle$ using elementary gates?

7 votes
Accepted

How can we construct a control-control y-rotation (CCRy) gate in Qiskit?

6 votes

Where is CZ gate in IBM Quantum circuit composer

6 votes
Accepted

How do I trace out the second qubit to find the reduced density operator?

6 votes
Accepted

If quantum computing always return random measurement (or uncertain measurement), why do we still need it?

6 votes

Is it possible to have access to real quantum computers that have more than 15 qubits for my master thesis?

6 votes

What qiskit version?

6 votes

Topology graphs of IBM's quantum computers

6 votes
Accepted

Qiskit: count the type of gates on the qubit with the largest number of gates in a multi-qubit circuit

6 votes
Accepted

Papers on classical optimization in QAOA

6 votes
Accepted

How many shots should one take to get a reliable estimate in a quantum program?

6 votes
Accepted

How instantaneous is state preparation in a quantum register, if all possible superpositions are to be initialized equally?

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