Quantum Computing

Notable Question

 Notable Question
Question with 2,500 views. This badge can be awarded multiple times.
Awarded 268 times.
Get state vector of a single qubit in a circuit in Qiskit
Awarded 2 days ago
How to reduce circuit elements of a decomposed $C^2(U)$ operation?
Awarded Nov 29 at 3:34
ModuleNotFoundError: No module named 'qiskit_aer'
Awarded Nov 28 at 6:15
A CNOT between two Hadamard gates: why does the CNOT changed the output of the second Hadamard gate?
Awarded Nov 23 at 1:35
CNOT expressed with CZ and H gates by taking into account HZH =X
Awarded Nov 16 at 16:07
How to make a circuit for the CNOT using $H$ and $CZ$ gates?
Awarded Nov 13 at 23:36
How to represent the Hadamard gate as a rotations on the Bloch sphere?
Awarded Nov 12 at 0:10
How is the polarization of a photon able to hold quantum information?
Awarded Nov 11 at 3:51
How to append an Instruction to a QuantumCircuit with variable length of QuantumRegisters as qargs?
Awarded Nov 9 at 7:07
Measuring T1 and T2 constants on IBM Q
Awarded Nov 6 at 16:47
How to measure in the bell basis?
Awarded Nov 2 at 9:29
How to decompose this two-qubit unitary matrix to the standard gate set?
Awarded Oct 27 at 23:06
What's an use case of the inner product between two qubits in a quantum algorithm?
Awarded Oct 27 at 13:18
What is the difference between Bloch's sphere and IBM's Q-sphere?
Awarded Oct 17 at 3:33
What is the difference between signaling and non-signaling quantum correlations, and what is a signaling channel?
Awarded Oct 16 at 5:43
What's the difference between Kraus operators and measurement operators?
Awarded Oct 15 at 20:42
Can I understand mixed states using the Bloch sphere? [duplicate]
Awarded Oct 10 at 17:15
Definition of the Pauli group and the Clifford group
Awarded Oct 6 at 15:22
How power-efficient are quantum computers?
Awarded Oct 5 at 3:12
Why isn't there a contradiction between the existence of CNOT gate/entanglement and the no-cloning theorem?
Awarded Oct 4 at 15:43
How should I understand the change of qubit's basis as a rotation?
Awarded Sep 27 at 19:06
How to translate the Hadamard gate matrix into Dirac notation?
Awarded Sep 24 at 1:05
What are quantum computers actually doing today?
Awarded Sep 18 at 8:40
Why can't we use a two-qubit entangled state to send information faster than light? [duplicate]
Awarded Sep 14 at 10:03
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 $?
Awarded Sep 12 at 2:04
How to obtain Y rotation with only X and Z rotations gates?
Awarded Sep 11 at 13:09
Pennylane and Qiskit for quantum machine learning
Awarded Sep 5 at 2:06
Square root of Pauli operators: is there a common convention to define them uniquely?
Awarded Sep 3 at 21:11
Why can't we simulate a Qubit using classical computer?
Awarded Aug 30 at 16:26
What's the role of mixer in QAOA?
Awarded Aug 10 at 19:08
Access results from an experiment without having to run the script again
Awarded Aug 4 at 14:49
What are the differences between Qiskit's AerSimulator, QasmSimulator and StatevectorSimulator?
Awarded Jul 20 at 17:03
Deduce the Kraus operators of the dephasing channel using the Choi
Awarded Jul 16 at 18:49
Intuition about Knill-Laflamme QEC conditions
Awarded Jul 11 at 14:27
How to initialize a qubit with a custom state in Qiskit Composer
Awarded Jul 10 at 1:10
Quantum fidelity simplified formula while both of the density matrices are single qubit states
Awarded Jul 7 at 18:41
Qiskit Inverse of a quantum fourier transformation
Awarded Jul 5 at 10:10
Why is the state of multiple qubits given by their tensor product?
Awarded Jun 26 at 19:19
Significance of The Church of the Higher Hilbert space
Awarded Jun 14 at 22:33
What is the Helstrom measurement?
Awarded Jun 14 at 9:32
What qiskit version?
Awarded Jun 13 at 22:50
Show that a $CZ$ gate can be implemented using a $CNOT$ gate and Hadamard gates
Awarded May 28 at 19:49
How to initialize classical register in Qiskit?
Awarded May 25 at 7:17
Is VQE a class of algorithms or a specific algorithm?
Awarded May 24 at 11:19
How does the CX gate work?
Awarded May 20 at 23:12
How to prove that antipodal points on the Bloch sphere are orthogonal?
Awarded May 18 at 19:41
How do I apply the Hadamard gate to one qubit in a two-qubit pure state?
Awarded May 13 at 15:35
IBMQ.load_account from stored ACCOUNT is failing on Qiskit 0.9.0
Awarded May 10 at 20:40
Error: cannot import name 'BaseBackend' from 'qiskit.providers'
Awarded May 6 at 0:10
Updating qiskit doesn't update qiskit version using jupyter notebook/terminal
Awarded Apr 29 at 15:40
Why do quantum gates have to be unitary?
Awarded Apr 29 at 4:31
What does it mean to express a gate in Dirac notation?
Awarded Apr 27 at 9:05
Can a quantum computer break quantum cryptography?
Awarded Apr 14 at 2:12
Does anyone know the list of all known universal sets of quantum gates?
Awarded Apr 8 at 20:35
Measure a state in Hadamard basis [closed]
Awarded Apr 6 at 3:56
Big Endian vs. Little Endian in Qiskit
Awarded Apr 4 at 14:51
Quantum Computing Qiskit - How to read data from classical registers
Awarded Apr 4 at 5:36
Quantum Supremacy: Some questions on cross-entropy benchmarking
Awarded Mar 31 at 10:52
What is the relation between these two forms of a single-qubit unitary operation?
Awarded Mar 21 at 11:16
How to add several parameters in qiskit circuit?
Awarded Mar 19 at 6:41
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