Quantum Computing

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 Popular Question
Question with 1,000 views. This badge can be awarded multiple times.
Awarded 960 times.
Why is the Bloch sphere three-dimensional?
Awarded 9 hours ago
What is "Lindblad Superoperator" in Stochastic Master Equation
Awarded yesterday
Prove that there exist tripartite $|\psi\rangle$ which cannot be written as $|\psi\rangle=\sum_i\lambda_i|i_A\rangle|i_B\rangle|i_C\rangle$
Awarded yesterday
What does it mean to take the Choi-Jamiolkowski of a quantum channel?
Awarded yesterday
Memory Requirements for Qiskit Aer Simulator
Awarded 2 days ago
How does the Kraus decomposition imply the Stinespring representation?
Awarded Dec 2 at 9:45
What's an example of building a circuit $U_f$ that implements a simple function $f$?
Awarded Dec 2 at 1:48
Clarifying Mosca's Inequality Theorem - parallel vs additive
Awarded Dec 1 at 17:31
How can pure state ensemble decompositions not be unique?
Awarded Nov 30 at 1:02
Can Shor‘s code correct two- or three-qubit errors?
Awarded Nov 29 at 23:35
Which unicode character should be used for the angle brackets in braket notation?
Awarded Nov 29 at 17:40
How do we understand Jordan's Lemma?
Awarded Nov 28 at 21:26
Help on PySCF library
Awarded Nov 27 at 22:42
Meaning of "diagonal to the computational basis"
Awarded Nov 27 at 2:35
Why does job appear to be stuck in queue on IBMQ backend?
Awarded Nov 26 at 21:04
Cirq: easiest way to compute qubit Hamiltonian expectation value with number of shots
Awarded Nov 26 at 19:47
Show how the Bell state arises from the circuit with Hadamard and CNOT, using matrix notation
Awarded Nov 26 at 5:07
Can quantum circuits/operations have truth tables?
Awarded Nov 26 at 3:41
How to convert the output column vector or matrix into bra ket notation using python?
Awarded Nov 23 at 13:57
From Q# measurements to Bloch sphere
Awarded Nov 23 at 1:48
Expected repetitions of the quantum part of Shor's algorithm
Awarded Nov 22 at 4:31
Construct a standard oracle using a phase oracle
Awarded Nov 21 at 12:34
Which qiskit backend is faster in execution of the quantum circuit prepared?
Awarded Nov 20 at 17:35
Why are diagonal Hamiltonians considered classical?
Awarded Nov 19 at 19:05
How to properly understand Born's rule as written in the Feynman Lectures?
Awarded Nov 17 at 20:04
construction of Y gate from X,Z and H gates
Awarded Nov 16 at 22:16
Quantum comparator with one fixed input
Awarded Nov 16 at 16:50
What are boost and shift operators and why are they called so?
Awarded Nov 15 at 17:50
Why is the time ordering omitted in the trotterised version of the time-dependent evolution operator?
Awarded Nov 15 at 11:52
A necessary and sufficient condition for the existence of a nontrivial square root in Shor's algorithm
Awarded Nov 15 at 7:45
Can a Toffoli gate be implemented using Fredkin gates?
Awarded Nov 15 at 6:43
What constitutes a quantum database?
Awarded Nov 15 at 5:28
What does negative probability represent?
Awarded Nov 15 at 0:48
Transpiler Error: Number of qubits greater than maximum in coupling map [closed]
Awarded Nov 14 at 22:19
Is it possible to "calculate" the absolute value of a permanent using Boson Sampling?
Awarded Nov 14 at 19:41
How to execute many circuits on an IBMQ backend?
Awarded Nov 12 at 23:46
Prove that any Hermitian Matrix is a real linear combination of Pauli operators [duplicate]
Awarded Nov 11 at 3:08
What is the default coupling map for qiskit
Awarded Nov 10 at 23:35
How can we construct a control-control y-rotation (CCRy) gate in Qiskit?
Awarded Nov 8 at 20:16
Quantum Fourier Transform without SWAPs
Awarded Nov 8 at 20:01
Basic gates sets
Awarded Nov 8 at 18:26
Matrix representation and CX gate [duplicate]
Awarded Nov 8 at 16:28
Qiskit Encoding of a Hamiltonian
Awarded Nov 8 at 14:18
Problem with controlled rotation in HHL
Awarded Nov 8 at 11:22
What cryogenic systems are suitable for superconducting qubits?
Awarded Nov 8 at 5:42
Tips and tricks for constructing circuits to generate arbitrary quantum states
Awarded Nov 8 at 3:42
Getting a layout for qubits in Qiskit
Awarded Nov 8 at 3:09
What is Ising Hamiltonian ? What its role in Portfolio Diversification?
Awarded Nov 7 at 22:15
Implementing Grover's oracle with multiple solutions in Qiskit
Awarded Nov 7 at 2:56
Why a single qubit is a state in 2D Hilbert space and not 3D or higher?
Awarded Nov 7 at 0:51
Is every single-qubit unitary just a rotation around some unit vector on the Bloch sphere?
Awarded Nov 4 at 16:47
Purity of mixed states as a function of radial distance from origin of Bloch ball
Awarded Nov 3 at 18:05
Understanding Grover’s Oracle for 3-SAT
Awarded Nov 1 at 21:48
Understanding Google's “Quantum supremacy using a programmable superconducting processor” (Part 1): choice of gate set
Awarded Nov 1 at 2:48
Inverting the depolarizing channel
Awarded Oct 31 at 0:26
How to find the eigenstates of a general $2\times 2$ Hermitian matrix?
Awarded Oct 30 at 17:25
How do I check if a gate represented by Unitary $U$ is a Clifford Gate?
Awarded Oct 30 at 1:19
What is the IQ plane?
Awarded Oct 29 at 17:20
What is the state of the art on Quantum Random Access Memories? [duplicate]
Awarded Oct 28 at 21:42
What would be an ideal fidelity measure to determine the closeness between two non unitary matrices?
Awarded Oct 27 at 14:02
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