Quantum Computing Stack Exchange

4

votes

1

answer

62

views

Why do we use the quantum superposition for a period instead of factors in Shor's algorithm?

answered 14 hours ago Sam Jaques 188

1

vote

1

answer

27

views

Is there a way to reverse the amplitudes of a quantum system?

algorithm grovers-algorithm amplitude-amplification

modified 14 hours ago Blue♦ 6,210

4

votes

0

answers

59

views

Does Shor's algorithm end the search for factoring algorithms in the quantum world of computation?

algorithm shors-algorithm

modified 15 hours ago R. Chopin 530

1

vote

1

answer

18

views

Cannot load account with Qiskit

qiskit

answered 19 hours ago James Wootton 6,557

3

votes

1

answer

43

views

Garbage-Free Reversible Binary-To-Unary Decoder Construction

algorithm circuit-construction

modified yesterday Craig Gidney 4,356

1

vote

0

answers

17

views

Qiskit gates in LaTeX representation: notation meaning [duplicate]

quantum-gate qiskit notation

modified yesterday Blue♦ 6,210

0

votes

1

answer

63

views

What is the meaning of the state $|1\rangle-|1\rangle$?

quantum-gate quantum-state notation

modified yesterday Blue♦ 6,210

3

votes

2

answers

165

views

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

quantum-gate gate-synthesis tensor-product

modified yesterday DaftWullie 13.9k

2

votes

1

answer

27

views

Consistent QISkit error: “All devices are currently unavailable”

programming qiskit ibm-q-experience

answered yesterday James Wootton 6,557

6

votes

0

answers

66

views

How is Bell’s Inequality converted to the CHSH inequality?

quantum-information correlations

modified 2 days ago Bob 31

9

votes

0

answers

71

views

Quantum machine learning after Ewin Tang

algorithm quantum-state machine-learning quantum-advantage

asked 2 days ago Alex 146

6

votes

1

answer

79

views

Is there a relation between the factorisation of the joint conditional probability distribution and Bell inequality?

entanglement density-matrix superposition

modified 2 days ago glS 4,071

0

votes

0

answers

50

views

Why is Nielsen and Chuang book so popular in this field? [on hold]

nielsen-and-chuang

modified 2 days ago Tejas Shetty 14

2

votes

1

answer

47

views

Concurrence for a two qubit state

quantum-state quantum-information entanglement

modified 2 days ago DaftWullie 13.9k

5

votes

1

answer

121

views

Understanding the Group Leaders Optimization Algorithm

quantum-gate circuit-construction optimization

modified 2 days ago Santa 1

3

votes

1

answer

28

views

How to add control to gates in Cirq?

programming cirq

modified Feb 18 at 22:50 Craig Gidney 4,356

3

votes

1

answer

34

views

Partial Transpose and Positive Operators

quantum-information entanglement mathematics quantum-operation

modified Feb 18 at 16:59 Blue♦ 6,210

2

votes

0

answers

15

views

Can one make NV centred type qubits from analogus materials in the periodic table?

physical-realization physical-qubit experiment chemistry

modified Feb 18 at 12:36 Blue♦ 6,210

2

votes

1

answer

60

views

If CNOTs and single qubit gates are universal then why do we need to prove that controlled U operations can be composed by them as well?

quantum-gate gate-synthesis nielsen-and-chuang

modified Feb 18 at 11:49 DaftWullie 13.9k

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

4

votes

1

answer

37

views

Creating .gifs corresponding to Quirk simulations

simulation quirk

answered Feb 17 at 21:23 Craig Gidney 4,356

7

votes

2

answers

82

views

Equivalent unitary transformations

algorithm quantum-gate phase-kickback

modified Feb 17 at 14:19 AHusain 1,819

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

6

votes

2

answers

87

views

A two qubit state in a special form

quantum-state

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

123

votes

13

answers

27k

views

Is quantum computing just pie in the sky?

classical-computing applications history

modified Feb 16 at 21:02 Blue♦ 6,210

1

vote

1

answer

73

views

Can we teleport a human or send information faster than light using quantum teleportation?

quantum-information teleportation

modified Feb 16 at 18:51 Siddhānt Singh 1,003

30

votes

7

answers

6k

views

Why is it harder to build quantum computers than classical computers?

physical-realization quantum-information classical-computing

modified Feb 16 at 13:05 cyberbird 29

16

votes

4

answers

876

views

Are there any organised resources available from where I can begin my quantum computing studies?

resource-request

answered Feb 16 at 0:58 ahelwer 1,791

4

votes

1

answer

53

views

What resources are available for learning QCL?

programming resource-request

modified Feb 15 at 23:02 Stephane Rolland 105

3

votes

0

answers

56

views

Any tips on where to start learning quantum computing? [duplicate]

resource-request

modified Feb 15 at 23:02 Stephane Rolland 105

3

votes

1

answer

22

views

How to set a starting state in cirq?

programming cirq

modified Feb 15 at 18:13 Craig Gidney 4,356

5

votes

1

answer

486

views

What is Qconfig in QISKit and how do I set it up?

programming qiskit

modified Feb 15 at 14:58 Sathiesh Kaliy 1

2

votes

0

answers

49

views

ProjectQ - In which part of the controlled gate object are the control bits scored

quantum-gate programming simulation

modified Feb 15 at 9:14 Blue♦ 6,210

3

votes

1

answer

24

views

Using parametrised values and 'Symbols' in Cirq

programming cirq

modified Feb 14 at 23:02 Craig Gidney 4,356

4

votes

3

answers

75

views

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

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

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

37

votes

4

answers

1k

views

Is it possible for an encryption method to exist which is impossible to crack, even using quantum computers?

complexity-theory cryptography

modified Feb 13 at 15:40 Cryptopacalypse 1

3

votes

1

answer

49

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

5

votes

0

answers

64

views

Quantum teleportation with moving Alice and Bob

quantum-information teleportation

modified Feb 13 at 9:44 glS 4,071

0

votes

1

answer

69

views

Why does $|P_U − P_V |$ equal $\langle \psi |U^{\dagger} M U|\psi\rangle −\langle \psi |V^{\dagger} M V |\psi\rangle$?

quantum-gate quantum-state measurement nielsen-and-chuang

modified Feb 13 at 8:42 Josu Etxezarreta Martinez 1,573

4

votes

0

answers

19

views

Construction of optimal ensemble to show quantum steerability

entanglement nonclassicality

modified Feb 12 at 19:32 glS 4,071

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

6

votes

1

answer

28

views

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

3

votes

1

answer

50

views

Do the probability amplitudes describe the probability of projective measurement?

quantum-state measurement

modified Feb 12 at 0:40 bilanush 85

5

votes

2

answers

63

views

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

8

votes

2

answers

105

views

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

1

vote

1

answer

68

views

QISKit warrning on marshmallow

programming qiskit

answered Feb 11 at 5:35 Leron Gil 31

Top Questions

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.