Hottest Questions This Month

4

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457

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What's an use case of the inner product between two q-bits in a quantum algorithm?

quantum-algorithms

modified Oct 1 at 16:56 Aman 127

8

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3

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94

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How is computation done in a 2D surface code array?

quantum-error-correction

modified Oct 18 at 10:22 Niel de Beaudrap 4,916

4

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3

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134

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quantum-algorithms

answered Oct 17 at 19:57 AHusain 800

3

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84

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What is the matrix for the operator that implements a function to tell the parity of its argument?

quantum-gate matrix-representation

modified yesterday R. Chopin 360

12

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82

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Connection between stabilizer generators and parity check matrices in the Steane code

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modified Oct 10 at 20:13 Adam 109

7

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110

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Do any educational quantum computing toys or devices exist?

resource-request photonics

modified Oct 11 at 1:21 ahelwer 760

6

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2

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120

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Analyzing the three-polarizing-filter experiment as a quantum circuit

photonics

modified Sep 25 at 13:09 Niel de Beaudrap 4,916

4

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3

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53

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What's an example of building a circuit $U_f$ that implements a simple function $f$?

quantum-gate

modified yesterday cnada 1,063

3

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2

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79

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Are the squared absolute values of the eigenvalues of a unitary matrix always 1?

phase-estimation

modified Oct 10 at 16:34 user1271772 4,732

2

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2

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153

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How do I construct a Density Matrix corresponding to a Hamiltonian?

qubit-state quantum-programming density-matrix hamiltonian-simulation

modified Oct 7 at 10:31 Blue 5,458

9

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2

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83

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Is there a simple rule for the inverse of a Clifford circuit's stabilizer table?

pauli-matrices clifford-group

modified Sep 25 at 10:31 Niel de Beaudrap 4,916

4

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2

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68

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Do the probability amplitudes of the superposition state produced by the QFT transform convey useful information?

quantum-algorithms quantum-information shors-algorithm quantum-fourier-transform

answered Oct 18 at 12:06 glS 3,206

4

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2

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84

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Quantum computing concepts

quantum-computing-models

answered Sep 26 at 9:28 DaftWullie 9,106

6

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3

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64

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quantum-algorithms quantum-gate circuit-model

modified Oct 13 at 10:54 user1271772 4,732

5

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56

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Simulation vs Construction of Fredkin gate with Toffoli gates

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modified Oct 15 at 19:52 Niel de Beaudrap 4,916

7

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3

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52

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General construction of $W_n$-state

quantum-algorithms quantum-entanglement qubit-state

answered Oct 5 at 18:20 Craig Gidney 2,637

5

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2

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107

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Is there a general method to implement a 'greater than' quantum circuit?

quantum-algorithms quantum-computer mathematics circuit-construction

answered Oct 5 at 17:47 AHusain 800

6

votes

1

answer

192

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What's a Qubit on D-Wave 2000Q?

d-wave

modified Oct 12 at 19:52 Mithrandir24601♦ 2,131

6

votes

1

answer

110

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How would one implement a quantum equivalent of a while loop in IBM QISkit?

quantum-gate qiskit controlled-gates

modified Sep 25 at 16:51 James Wootton♦ 5,497

5

votes

2

answers

63

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When would I consider using an outer product of quantum states, to describe aspects of a quantum algorithm?

mathematics

modified Oct 3 at 15:53 Niel de Beaudrap 4,916

6

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1

answer

92

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Depolarizing channel implementation on IBM Q

ibm-q-experience noise quantum-channel

modified Oct 16 at 2:57 Mathophile-Mathochist 90

5

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1

answer

62

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How to construct the “Inversion About the Mean” operator?

q#

answered Sep 22 at 23:57 Mariia Mykhailova 947

6

votes

1

answer

61

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Relation between $\mathrm{QMA}$ and $\mathrm{P^{QMA}}$

complexity-theory qma

modified Oct 9 at 8:18 Niel de Beaudrap 4,916

2

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2

answers

129

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Many-Worlds Interpretation and GHZ States

qubit quantum-entanglement

answered Oct 16 at 7:22 DaftWullie 9,106

4

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1

answer

122

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Qutrit Teleportation

quantum-algorithms quantum-gate qutrit

answered Sep 29 at 16:50 Craig Gidney 2,637

0

votes

2

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86

views

More information about Quantum computer [closed]

quantum-computer

answered Sep 24 at 14:42 user1271772 4,732

9

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1

answer

101

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Does the D-Wave 2000Q satisfy DiVincenzo's criteria?

quantum-computer architecture d-wave adiabatic-model scalability

modified Oct 12 at 19:54 Mithrandir24601♦ 2,131

2

votes

3

answers

76

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Calculating measurement result of quantum swap circuit

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modified Oct 16 at 14:00 user1271772 4,732

1

vote

1

answer

125

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Why is this Hamiltonian matrix diagonal?

qubit-state density-matrix hamiltonian-simulation

modified Oct 7 at 10:32 Blue 5,458

5

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1

answer

59

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How can I decompose a gate into $\{\mathrm{CNOT}, \mathrm{H}, \mathrm{P}(\theta)\}$?

quantum-gate gate-synthesis universal-gates

answered Oct 1 at 7:08 DaftWullie 9,106

5

votes

1

answer

44

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Efficiently performing controlled rotations in HHL

quantum-algorithms hhl-algorithm

answered Oct 16 at 10:03 DaftWullie 9,106

5

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1

answer

55

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Flying qubits compared with stationary qubits

quantum-programming bloch-sphere

answered Sep 27 at 11:04 DaftWullie 9,106

3

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1

answer

79

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How many qubits does it take to break a 10 characters password?

cryptography grovers-algorithm shors-algorithm

modified Oct 2 at 16:51 AHusain 800

5

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1

answer

61

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How to apply the outer product operator?

quantum-gate

answered Oct 2 at 21:53 cnada 1,063

4

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2

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60

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What happens when I input two qubits starting at state $|00\rangle$ into a hadamard gate

quantum-computer quantum-gate

modified 11 hours ago John Jepson 23

5

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1

answer

73

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Entanglement state preparation by using amplitude values

quantum-entanglement qiskit

modified Sep 27 at 22:42 Frédéric Grosshans 125

1

vote

2

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40

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Why does a rotation of $\pi/2$ on $|1\rangle$ yield $i|1\rangle$?

quantum-gate

answered Oct 18 at 20:28 Dyon J Don Kiwi van Vreumingen 312

6

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1

answer

51

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How to say “apply CNOT on q-bit 1 controlled by q-bit 2”?

quantum-gate

modified Sep 26 at 22:34 ahelwer 760

3

votes

1

answer

51

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Protocol for entaglement swapping

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modified Oct 4 at 21:15 Niel de Beaudrap 4,916

2

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1

answer

49

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What quantum gate is XNOR equivalent to?

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modified Oct 1 at 1:21 meowzz 1,096

7

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1

answer

38

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Collective measurements: importance and realization

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modified Sep 26 at 8:13 DaftWullie 9,106

3

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1

answer

48

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Why does Grover's search invert about the mean?

grovers-algorithm

modified Oct 15 at 4:34 Craig Gidney 2,637

4

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1

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78

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Introductory resources for learning about quantum Hamiltonians

resource-request hamiltonian-simulation

answered Oct 6 at 17:36 user1271772 4,732

4

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1

answer

57

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Applying CNOT With Local Operations and Two EPR Pairs

quantum-algorithms quantum-gate quantum-entanglement

answered Oct 5 at 10:13 Josu Etxezarreta Martinez 881

3

votes

1

answer

52

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Quantum teleportation: second classical bit for removing entanglement?

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modified Oct 18 at 16:08 user1271772 4,732

4

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1

answer

62

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Understanding the Group Leaders Optimization Algorithm

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modified Oct 17 at 23:05 Blue 5,458

2

votes

1

answer

48

views

How to make “random U3” in QASM?

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answered Oct 9 at 8:41 James Wootton♦ 5,497

5

votes

1

answer

46

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Which QC platform is better to use on HPC cluster?

simulation

modified Sep 29 at 14:34 0x90 158

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