Quantum Computing Stack Exchange

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7

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What do states that are uncorrelated with respect to a given local measurement look like?

entanglement

asked 6 hours ago glS 13.3k

0

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1

answer

12

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Is the final state in the quantum period finding algorithm entangled?

algorithm shors-algorithm

answered 6 hours ago glS 13.3k

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1

answer

38

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How do I apply a matrix to a ket state?

mathematics textbook-and-exercises matrix-representation

answered 7 hours ago KAJ226 8,206

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1

answer

31

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Knill-Laflamme condition derivation in Nielsen&Chuang: issue to understand a part of the proof

textbook-and-exercises error-correction nielsen-and-chuang

answered 8 hours ago StarBucK 746

-2

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0

answers

16

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After creating the Ising Hamiltonian, how it can be used in QAOA to find the optimal solution? Instead of using quadratic program

programming quantum-gate algorithm ibm-q-experience qaoa

asked 9 hours ago Singh 1

2

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1

answer

55

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Qiskit IBMQ.load_account fails on version 0.20.0

qiskit programming

modified 14 hours ago Community♦ 1

1

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1

answer

32

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Transform circuit with 3 CNOTs in one with limited interactions on the first qubit

circuit-construction quantum-circuit

modified 16 hours ago glS 13.3k

0

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0

answers

11

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Solution to Qiskit textbook Lab 3. Accuracy of Quantum Phase Estimation

programming qiskit ibm-q-experience shors-algorithm phase-estimation

asked 18 hours ago martynscn 9

5

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1

answer

165

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What are the benefits of using quantum machine learning?

machine-learning quantum-enhanced-machine-learning pennylane

modified 19 hours ago Community♦ 1

1

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0

answers

16

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issues running a 32 qubit grover's algorithm

ibm-q-experience grovers-algorithm

asked 22 hours ago James Bian 75

1

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1

answer

29

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Qiskit Portfolio Optimization : Does the resulting matrix show the stock combination to select?

qiskit ibm-q-experience vqe optimization

answered yesterday des137 11

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0

answers

31

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Set the bounds for ansatz parameters in VQE

qiskit vqe optimization parametrization

modified yesterday Antonio Anna Mele 71

4

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1

answer

50

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CNOT error rate of 1 in IBM Quantum Experience

quantum-gate ibm-q-experience

answered yesterday luciano 2,562

5

votes

2

answers

2k

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What is the square root of the NOT gate?

quantum-gate matrix-representation

modified yesterday Community♦ 1

2

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0

answers

31

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From QUBO problem to quantum circuit [duplicate]

hamiltonian-simulation quantum-circuit

modified yesterday incud 629

2

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1

answer

60

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Prove that any Hermitian Matrix is a real linear combination of Pauli operators [duplicate]

hamiltonian-simulation pauli-gates linear-algebra

modified yesterday glS 13.3k

2

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0

answers

18

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Clean definition and interpretation of “error” in quantum error correction

error-correction

asked yesterday StarBucK 746

18

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1

answer

888

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Is there a list of accessible open problems in quantum computing from a theoretical computer science perspective?

algorithm resource-request complexity-theory research

answered yesterday Mark S 4,859

2

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1

answer

27

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Add FreezeCoreOrbitals on ElectronicStructureProblem

programming qiskit chemistry

modified yesterday glS 13.3k

4

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0

answers

49

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Who first studied nonlocal games with probabilistic predicate?

resource-request non-locality games

modified 2 days ago glS 13.3k

2

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1

answer

40

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What's free evolution for a period T?

quantum-gate quantum-state physical-qubit

answered 2 days ago Quantum Mechanic 201

1

vote

2

answers

74

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Show when $a_k$ and $b_k$ are correlated when measuring in different bases, in the BB84 protocol

measurement textbook-and-exercises nielsen-and-chuang cryptography bb84

modified 2 days ago glS 13.3k

4

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1

answer

99

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How do we determine the direction of a time evolution $e^{-itH}$ on the Bloch sphere?

hamiltonian-simulation bloch-sphere

modified 2 days ago glS 13.3k

5

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3

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103

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Can I find the axis of rotation for any single-qubit gate?

qiskit quantum-gate bloch-sphere

modified 2 days ago glS 13.3k

2

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1

answer

34

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Time result for my algorithm

programming qiskit algorithm ibm-q-experience

modified 2 days ago glS 13.3k

1

vote

1

answer

82

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Argue positivity of mean value of an entanglement witness matrix for all separable state

entanglement

modified 2 days ago quantum_student 11

5

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1

answer

79

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Can we calculate the quantum volume of a classical computer?

architecture technical-standards quantum-volume

modified 2 days ago glS 13.3k

0

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0

answers

40

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How do you build the modified Toffoli gate using only local unitary and CNOT operations?

programming quantum-gate circuit-construction

modified 2 days ago glS 13.3k

2

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5

answers

322

views

What qiskit version?

programming qiskit

answered 2 days ago DaftWullie 37.3k

2

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3

answers

82

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What is the point of Grover's algorithm, really?

algorithm grovers-algorithm

answered May 13 at 0:51 benrg 294

2

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1

answer

38

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Replacement of FermionicOperator from qiskit.chemistry in qiskit_nature

programming qiskit

answered May 12 at 22:01 KAJ226 8,206

2

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2

answers

131

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Where I can read about protein folding on quantum computers with simple examples?

qiskit resource-request biology

modified May 12 at 19:01 Community♦ 1

1

vote

1

answer

24

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How to import circuit libraries into qiskit

programming qiskit ibm-q-experience qasm

modified May 12 at 15:45 glS 13.3k

2

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1

answer

57

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configuration of FakeOpenPulse2Q

programming qiskit openpulse

answered May 12 at 14:24 Patrick Mensac 126

5

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2

answers

52

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Can any “control-something unitary” be written with control and target spaces flipped?

circuit-construction unitarity

modified May 12 at 14:23 glS 13.3k

4

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1

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40

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Where is entanglement present and absent in the one clean qubit model of computation?

entanglement models terminology

modified May 12 at 13:48 Mark S 4,859

1

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1

answer

43

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IBM quantum computer giving the wrong result?

ibm-q-experience ibm

modified May 12 at 10:44 luciano 2,562

2

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2

answers

45

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Who is responsible for implementing quantum error correction?

ibm-q-experience error-correction shors-algorithm ibm

answered May 12 at 7:18 holl 76

1

vote

1

answer

24

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Quantum gates with respect to phase angles

quantum-gate linear-algebra

answered May 12 at 7:13 DaftWullie 37.3k

0

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1

answer

55

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Compute measurement values of observables by Qiskit

qiskit vqe

modified May 12 at 2:02 Community♦ 1

0

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0

answers

44

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How to simplify a circuit with repeated same parts?

programming qiskit ibm-q-experience

modified May 11 at 18:53 rjh324 1,247

3

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2

answers

46

views

Inverse of Statevector.from_label in Qiskit

programming qiskit

modified May 11 at 18:04 Frank 376

4

votes

1

answer

123

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Integer Eigenvalues leading to periodicity

algorithm

modified May 11 at 16:07 Community♦ 1

3

votes

1

answer

32

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Quantum State Tomography from IQ plane data

quantum-state machine-learning tomography quantum-process-tomography

answered May 11 at 15:48 Quantum Mechanic 201

2

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1

answer

26

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Performing a generic single-qubit Pauli error channel in stim

programming stim

modified May 11 at 14:42 Craig Gidney 12.8k

3

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1

answer

32

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Unit vanishes in the Quantum Cramer-Rao Bound?

mathematics quantum-fisher-information quantum-metrology

modified May 11 at 12:34 glS 13.3k

2

votes

1

answer

68

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Is RYY gate not available in IBM Quantum Composer?

quantum-gate ibm-q-experience circuit-construction

modified May 11 at 12:33 glS 13.3k

3

votes

1

answer

59

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When and how do we use basis embedding?

simulation machine-learning quantum-enhanced-machine-learning clifford-group

modified May 11 at 11:59 narip 533

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