Hottest Questions This Month

6

votes

3

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392

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Is there any method of adding two operators in a circuit?

modified Jan 31 at 14:29 James 150

8

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2

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2k

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Why is quantum Fourier transform required in Shor's algorithm?

algorithm complexity-theory shors-algorithm quantum-fourier-transform

modified Feb 8 at 15:33 Community♦ 1

10

votes

2

answers

677

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Optimal strategy to a quantum state game

quantum-state measurement games

modified Jan 29 at 13:58 Blue♦ 6,210

5

votes

2

answers

354

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How to recognize if a paper is talking about quantum annealing or gate logic?

quantum-gate adiabatic-model machine-learning

modified Feb 4 at 8:33 DaftWullie 13.9k

3

votes

2

answers

165

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Composing the CNOT gate as a tensor product of two level matrices

quantum-gate gate-synthesis tensor-product

modified yesterday DaftWullie 13.9k

4

votes

3

answers

75

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Why is there a difference between the simulation results and the actual quantum computer results?

simulation ibm-q-experience

answered Feb 14 at 18:30 Siddhānt Singh 1,003

6

votes

2

answers

96

views

Who discovered the phase kickback trick?

history phase-kickback

answered Feb 9 at 0:13 Mark S 448

6

votes

2

answers

87

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A two qubit state in a special form

quantum-state

modified Feb 16 at 23:20 Mithrandir24601♦ 2,336

1

vote

3

answers

71

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Is it correct to say that we need controlled gates because unitary matrices are reversible?

quantum-gate unitarity

modified Feb 8 at 3:22 Blue♦ 6,210

5

votes

2

answers

90

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Quantum proof for the group non-membership problem

quantum-state complexity-theory mathematics

answered Jan 24 at 16:26 John Watrous 1,698

5

votes

2

answers

63

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Constructing a circuit which performs the transformation $|x,y\rangle$ $\rightarrow$ $|x, x + y\text{ mod } 4\rangle$

algorithm circuit-construction

modified Feb 11 at 20:17 ahelwer 1,791

3

votes

1

answer

132

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ImportError: cannot import name 'QuantumProgram' from 'qiskit'

programming qiskit

modified Jan 29 at 12:55 Justin Youens 158

3

votes

1

answer

125

views

Is there a polynomial quantum algorithm for graph coloring?

algorithm complexity-theory space-complexity

modified Feb 10 at 19:35 John Watrous 1,698

2

votes

1

answer

256

views

How can quantum computing win 97% of times in coin flipping experiment?

quantum-information games

modified Jan 28 at 10:50 Blue♦ 6,210

4

votes

2

answers

56

views

Why is Grover's algorithm not converging monotonically? (Python implementation)

programming grovers-algorithm

answered Feb 4 at 7:37 DaftWullie 13.9k

3

votes

1

answer

291

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In Simon's algorithm, why is $f$ one-to-one if (and only if) $s=0^n$?

algorithm simons-algorithm

modified Feb 7 at 10:36 glS 4,071

8

votes

2

answers

105

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Fast way to check if two state vectors are equivalent up to Pauli operations

pauli-gates

modified Feb 11 at 19:13 Craig Gidney 4,356

3

votes

2

answers

92

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SWAP test inputs

quantum-gate circuit-construction

modified Feb 8 at 14:49 Aman 142

4

votes

3

answers

66

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Hadamard gate as a product of $R_x$, $R_z$ and a phase

quantum-gate gate-synthesis

modified Jan 25 at 10:43 cnada 2,389

1

vote

2

answers

66

views

Is programming in quantum computer same as programming in quantum simulator in classical computer?

programming q#

answered Feb 12 at 17:48 Mariia Mykhailova 1,605

4

votes

2

answers

63

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Non-uniqueness of pure states ensemble decomposition

quantum-information density-matrix

modified Jan 25 at 7:45 DaftWullie 13.9k

8

votes

1

answer

77

views

Current limits on Grover search space

architecture physical-realization grovers-algorithm ibmq

answered Feb 9 at 12:48 cnada 2,389

4

votes

1

answer

53

views

Interaction of an RF pulse with transmon qubit

physical-qubit superconducting-quantum-computing

modified Feb 17 at 3:56 DanielSank 929

3

votes

2

answers

63

views

Grover algorithm phase shift and steps

algorithm grovers-algorithm

answered Jan 24 at 3:07 glS 4,071

4

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2

answers

48

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Is the $|-\rangle$ state the only one that can do the trick for Grover's algorithm?

algorithm grovers-algorithm phase-kickback

modified Feb 7 at 8:12 Blue♦ 6,210

2

votes

2

answers

122

views

What is the actual mechanism behind quantum computing?

algorithm speedup

modified Feb 8 at 16:51 glS 4,071

4

votes

1

answer

155

views

Creating controlled R1 gates in Q#?

quantum-gate q#

answered Jan 31 at 6:52 Mariia Mykhailova 1,605

7

votes

2

answers

82

views

Equivalent unitary transformations

algorithm quantum-gate phase-kickback

modified Feb 17 at 14:19 AHusain 1,819

3

votes

1

answer

81

views

Why can't I connect to an IBMQ device?

programming ibm-q-experience

answered Jan 28 at 23:42 Justin Youens 158

0

votes

1

answer

77

views

How to read Dirac notation (without algebra)?

quantum-state superposition notation

modified Feb 4 at 20:07 Mithrandir24601♦ 2,336

6

votes

1

answer

28

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If $|\psi\rangle, U|\psi\rangle$ are known, how many pairs of such qubits are required to find the operator $U$?

quantum-gate quantum-state

modified Feb 12 at 15:42 Blue♦ 6,210

5

votes

1

answer

59

views

Where does the Xmon simulator from Googles cirq framework its entropy from?

measurement simulation cirq entropy nisq

answered Feb 2 at 21:46 Craig Gidney 4,356

6

votes

1

answer

90

views

Is quantum computer equivalent to Turing machine with matrix multiplication oracle?

complexity-theory matrix-representation

modified Feb 14 at 16:53 ahelwer 1,791

4

votes

1

answer

67

views

Grover operator as a rotation matrix

algorithm mathematics grovers-algorithm

answered Jan 29 at 18:50 glS 4,071

0

votes

1

answer

51

views

Transmission of information over long distances

quantum-information entanglement communication

answered Jan 29 at 8:57 DaftWullie 13.9k

4

votes

1

answer

83

views

Deprecation warnings in Qiskit (circuit drawing)

programming qiskit

modified Jan 29 at 2:48 Justin Youens 158

2

votes

1

answer

83

views

Decompose a general two-qubit gate into general controlled-qubit gates

quantum-gate circuit-construction gate-synthesis

modified Feb 13 at 23:07 Craig Gidney 4,356

0

votes

2

answers

49

views

Can I call $\{|0\rangle, |1\rangle\}$ the “standard computational basis” as it is done in linear algebra?

quantum-state

modified Feb 7 at 2:08 R. Chopin 530

2

votes

1

answer

60

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Proof that $2^n \times 2^n$ operator be decomposed in terms of $2 \times 2$ operators

quantum-gate gate-synthesis tensor-product

modified Feb 6 at 23:50 Learner 101

4

votes

2

answers

46

views

Simon's Algorithm - Probability that the measurement results in a string Y

algorithm simons-algorithm

answered Feb 5 at 20:49 glS 4,071

5

votes

1

answer

58

views

Is there any company that backs and implements diamond vacancy quantum computers?

physical-realization

answered Feb 3 at 12:44 Blue♦ 6,210

7

votes

2

answers

74

views

Simulate hamiltonian evolution

hamiltonian-simulation nielsen-and-chuang pauli-gates

answered Feb 18 at 8:24 DaftWullie 13.9k

3

votes

1

answer

89

views

Path to learn Qiskit as a tool for the future

programming qiskit resource-request

answered Jan 24 at 8:22 James Wootton 6,557

1

vote

1

answer

68

views

QISKit warrning on marshmallow

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answered Feb 11 at 5:35 Leron Gil 31

5

votes

1

answer

52

views

How does a $2 \pi$ pulse in Cirac Zoller give a -1 sign to the state?

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answered Feb 7 at 21:45 Siddhānt Singh 1,003

3

votes

1

answer

50

views

Is it possible to create a superposition in IBMQ QISkit which has probability amplitudes $|a|\neq |b|$?

quantum-state qiskit

modified Feb 13 at 10:20 James Wootton 6,557

4

votes

1

answer

61

views

Topological anyonic molecule statistics

topological-quantum-computing anyons

modified Jan 31 at 15:08 David Bar Moshe 1,164

3

votes

1

answer

47

views

Aren't reversible logic gates a necessity for efficiently executing quantum algorithms?

algorithm classical-computing models

modified Jan 28 at 7:55 DaftWullie 13.9k

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