User Martin Vesely

21 votes

Accepted

What's the difference between T1 and T2?

answered Feb 6, 2020 at 9:47

15 votes

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How to measure in another basis

answered Sep 6, 2020 at 6:15

14 votes

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Why isn't $Ry(\pi/2)$ gate equivalent to Hadamard gate?

answered Oct 24, 2021 at 17:15

10 votes

Why do we have to measure the circuit before sending it to the real quantum computer?

answered Jul 22, 2021 at 6:16

9 votes

Accepted

Negative of a qubit state

answered Mar 7, 2020 at 7:36

9 votes

What is the fastest quantum computational algorithm by which quantum computer speed up than classic one?

answered Sep 19, 2022 at 5:48

8 votes

How can I fill a unitary knowing only its first column?

answered Mar 20, 2020 at 11:01

8 votes

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Why is a Hadamard gate unitary?

answered Jan 3, 2020 at 11:08

7 votes

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How to implement a Fredkin gate using Toffoli and CNOTs?

answered Dec 27, 2019 at 21:38

7 votes

How do I write the matrix for a CZ gate operating on nonadjacent qubits?

answered Dec 12, 2019 at 21:52

7 votes

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What unitary gate produces these quantum states from the computational basis?

answered Jan 8, 2020 at 19:29

7 votes

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How does the CNOT gate work?

answered Mar 4, 2020 at 13:03

7 votes

Is there a gate that puts a qubit into superposition with a not so purely probabalistic (50 50) outcome?

answered Jun 1, 2020 at 8:30

7 votes

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How to show mathematically the equivalency between Ising Model and QUBO?

answered Oct 16, 2021 at 21:52

7 votes

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

answered Dec 30, 2020 at 9:16

7 votes

Why do quantum computers have more qubits than classical computers have bits?

answered Mar 9, 2022 at 14:50

6 votes

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What use cases are there for 127 qubit QPUs?

answered Feb 14, 2022 at 7:53

6 votes

What are examples of quantum computing platforms availble for free (other than IBM Q)?

answered Apr 28, 2020 at 22:23

6 votes

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Implementing a controlled-controlled-U using controlled-U

answered Apr 18, 2020 at 22:29

6 votes

Why IBM Quantum Experience is giving different results under ibmq_qasm_simulator and ibmq_16_melbourne?

answered Feb 20, 2020 at 17:39

6 votes

Accepted

How to interpret a 4 qubit quantum circuit as a matrix?

answered Jan 21, 2020 at 22:38

6 votes

Compute the output of the quantum teleportation circuit

answered Jan 25, 2020 at 9:22

6 votes

What is meant with "shot" in quantum computation?

answered Feb 11, 2020 at 7:26

6 votes

Accepted

Why is the order reversed on measurement?

answered Nov 21, 2019 at 22:39

6 votes

How to get specific state applying $e^{-i\phi \sigma_2/2}$ to $|0\rangle$ or $|1\rangle$?

answered Dec 6, 2019 at 23:42

5 votes

Accepted

What is "quantum internet" and what is its relation with quantum entanglement?

answered Feb 13, 2020 at 22:06

5 votes

Find the $\theta$ and $\phi$ values on the Bloch sphere corresponding to the state $\frac{1+i}{2}|0\rangle+\frac1{\sqrt2}|1\rangle$

answered Jan 9, 2020 at 11:21

5 votes

How can I get the entire histogram in a 5 qubit program done in IBM quantum experience machine?

answered Feb 27, 2020 at 10:55

5 votes

Currently, what are the best structured courses available online on quantum computing?

answered Mar 3, 2020 at 5:58

5 votes

Accepted

Is Quantum Computing a problem for Cryptography?

answered May 3, 2020 at 21:45

Stack Exchange Network

356 Answers

What's the difference between T1 and T2?

How to measure in another basis

Why isn't $Ry(\pi/2)$ gate equivalent to Hadamard gate?

Why do we have to measure the circuit before sending it to the real quantum computer?

Negative of a qubit state

What is the fastest quantum computational algorithm by which quantum computer speed up than classic one?

How can I fill a unitary knowing only its first column?

Why is a Hadamard gate unitary?

How to implement a Fredkin gate using Toffoli and CNOTs?

How do I write the matrix for a CZ gate operating on nonadjacent qubits?

What unitary gate produces these quantum states from the computational basis?

How does the CNOT gate work?

Is there a gate that puts a qubit into superposition with a not so purely probabalistic (50 50) outcome?

How to show mathematically the equivalency between Ising Model and QUBO?

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

Why do quantum computers have more qubits than classical computers have bits?

What use cases are there for 127 qubit QPUs?

What are examples of quantum computing platforms availble for free (other than IBM Q)?

Implementing a controlled-controlled-U using controlled-U

Why IBM Quantum Experience is giving different results under ibmq_qasm_simulator and ibmq_16_melbourne?

How to interpret a 4 qubit quantum circuit as a matrix?

Compute the output of the quantum teleportation circuit

What is meant with "shot" in quantum computation?

Why is the order reversed on measurement?

How to get specific state applying $e^{-i\phi \sigma_2/2}$ to $|0\rangle$ or $|1\rangle$?

What is "quantum internet" and what is its relation with quantum entanglement?

Find the $\theta$ and $\phi$ values on the Bloch sphere corresponding to the state $\frac{1+i}{2}|0\rangle+\frac1{\sqrt2}|1\rangle$

How can I get the entire histogram in a 5 qubit program done in IBM quantum experience machine?

Currently, what are the best structured courses available online on quantum computing?

Is Quantum Computing a problem for Cryptography?