Hottest Questions This Month

8

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2

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265

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How is it possible to implement unitary operator when its size is exponential in inputs?

circuit-construction gate-synthesis

answered 2 days ago glS 4,465

4

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2

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509

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How to superpose two composite qubit states?

modified Apr 17 at 14:27 Sanchayan Dutta♦ 6,706

3

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2

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369

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How to show a density matrix is in a pure/mixed state?

quantum-state quantum-information mathematics density-matrix

modified Apr 23 at 7:32 DaftWullie 15.8k

4

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2

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166

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Why can't a quantum computer strongly simulate itself?

resource-request measurement simulation

modified Apr 1 at 23:49 Niel de Beaudrap 6,230

2

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1

answer

183

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What is a complementary map?

quantum-information quantum-operation quantum-channel

modified Apr 10 at 13:05 Tobias Fritzn 106

3

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1

answer

297

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Grover's algorithm: number of searches

algorithm grovers-algorithm cryptography

modified Apr 1 at 14:25 Sanchayan Dutta♦ 6,706

5

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2

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138

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Hidden shift problem as a benchmarking function

algorithm quantum-state mathematics

answered Apr 8 at 5:52 MartinQuantum 495

1

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1

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474

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Preparing odd integers using quantum computation

quantum-gate quantum-state

modified Apr 15 at 10:57 Sanchayan Dutta♦ 6,706

4

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4

answers

129

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Implementing “Classical AND Gate” and “Classical OR Gate” with a quantum circuit

quantum-gate classical-computing unitarity

modified Apr 3 at 19:26 Siu Ching Pong -Asuka Kenji- 153

4

votes

1

answer

238

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Understanding this description of teleportation

algorithm quantum-state quantum-information teleportation

modified Apr 15 at 6:04 Mariia Mykhailova 1,920

6

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2

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165

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Will quantum computers be able to solve the game of chess?

algorithm quantum-information complexity-theory applications

modified Apr 8 at 18:03 Mark S 758

2

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1

answer

122

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How does the vectorization map relate to the Choi and Kraus representations of a channel?

quantum-information quantum-operation quantum-channel

modified Apr 17 at 9:22 glS 4,465

4

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1

answer

111

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What is an example of a measurement that is LOCC but not separable?

quantum-information measurement

modified Apr 8 at 19:36 John Watrous 1,988

3

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1

answer

132

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Quantum Toffoli gate equation

quantum-gate tensor-product

modified Apr 12 at 18:30 Sanchayan Dutta♦ 6,706

1

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1

answer

124

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How to construct a quantum circuit for the following state transformation?

quantum-state circuit-construction

modified Apr 5 at 16:38 AHusain 2,034

3

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1

answer

124

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Grover's algorithm – DES circuit as oracle?

algorithm grovers-algorithm cryptography

modified Apr 18 at 19:45 Sanchayan Dutta♦ 6,706

3

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2

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70

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What are the individual probabilities after √SWAP gate?

quantum-gate quantum-state

modified Apr 8 at 9:26 Reda Drissi 47

4

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1

answer

84

views

What is Stinespring Dilation?

quantum-operation

modified Apr 1 at 11:24 glS 4,465

0

votes

1

answer

80

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What can be a mini research project based on Grover's algorithm or the Deutsch Jozsa algorithm?

algorithm resource-request grovers-algorithm deutsch-jozsa-algorithm research

answered Mar 28 at 21:57 Mariia Mykhailova 1,920

3

votes

1

answer

98

views

How to prove universality for a set of gates?

quantum-gate universal-gates

modified Apr 12 at 6:07 DaftWullie 15.8k

3

votes

2

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74

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In what sense do repeated applications of Grover's operator rotate the state closer to the target?

grovers-algorithm nielsen-and-chuang

modified Mar 28 at 19:45 glS 4,465

1

vote

1

answer

72

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Associating quantum states with decimal numbers

quantum-state

modified Apr 22 at 19:28 Sanchayan Dutta♦ 6,706

2

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1

answer

116

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Quantum addition and modulo operation using gates

quantum-gate circuit-construction matrix-representation

answered Apr 15 at 15:58 Craig Gidney 4,728

4

votes

1

answer

89

views

Prove that the operator $H U_{0^\perp}H$ can be expressed as $2|\psi\rangle\langle\psi|-I$

algorithm grovers-algorithm

modified Apr 14 at 16:56 glS 4,465

2

votes

2

answers

85

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How does the probability of measurement turn out to be negative?

quantum-information entanglement density-matrix

answered Apr 19 at 8:19 Danylo Y 705

4

votes

1

answer

100

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Classical vs. quantum channel capacities

quantum-information quantum-operation quantum-channel entropy

modified Apr 11 at 13:12 John Watrous 1,988

7

votes

0

answers

154

views

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

algorithm resource-request complexity-theory research

modified Apr 2 at 2:13 Mark S 758

2

votes

1

answer

68

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Reason for evaluating $a^x \bmod N$ from $x = 0$ to $N^2$

algorithm mathematics shors-algorithm

modified Apr 5 at 14:36 Sanchayan Dutta♦ 6,706

3

votes

1

answer

49

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Is the Bernstein-Vazirani algorithm dependent on the specific behavior of the oracle?

algorithm bernstein-vazirani-algorithm

modified 2 days ago Jay S 16

3

votes

1

answer

80

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Notation for two qubit composite product state

quantum-state tensor-product notation

modified Apr 14 at 21:50 Sanchayan Dutta♦ 6,706

5

votes

1

answer

76

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Quantum teleportation with “noisy” entangled state

quantum-state entanglement density-matrix teleportation noise

answered Apr 18 at 21:44 Danylo Y 705

3

votes

1

answer

71

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Are there any other published quantum factoring algorithms that are simpler or more efficient than Shor’s?

algorithm quantum-gate shors-algorithm

modified Apr 10 at 11:57 Mark S 758

4

votes

1

answer

67

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Controlled unitary from the HHL algorithm – practical implementation using Qiskit

algorithm quantum-gate qiskit hhl-algorithm

modified Apr 17 at 14:42 Sanchayan Dutta♦ 6,706

3

votes

0

answers

131

views

What is the charging energy in relation to a superconducting transmon?

physical-qubit superconducting-quantum-computing

asked Apr 3 at 0:20 Logan 19

2

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1

answer

78

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Implementing these $N×N$ matrices on $\log N$ qubits

quantum-gate gate-synthesis

modified Mar 29 at 19:39 Sanchayan Dutta♦ 6,706

5

votes

0

answers

98

views

Proof of the optimality of Grover's algorithm

algorithm grovers-algorithm nielsen-and-chuang

modified Apr 14 at 15:22 glS 4,465

2

votes

1

answer

74

views

Experiment runtime on IBMQ

programming ibm-q-experience ibmq

answered Apr 15 at 13:19 Matthew Stypulkoski 181

1

vote

1

answer

57

views

(name of gate) is not in the list of basis operations

programming qiskit

answered Apr 9 at 17:49 Matthew Stypulkoski 181

3

votes

1

answer

65

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How does an oracle function in Grover's algorithm actually work?

algorithm grovers-algorithm deutsch-jozsa-algorithm

modified Mar 28 at 12:09 Mark S 758

4

votes

1

answer

49

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How is the expression for the optimal entanglement witness derived?

quantum-information entanglement

modified Apr 10 at 12:21 glS 4,465

2

votes

2

answers

48

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What is the tensorial representation of the quantum swap gate?

quantum-gate tensor-product

modified 2 days ago glS 4,465

2

votes

1

answer

37

views

How do I do printf debugging in Q# in a convenient way?

programming q#

answered Apr 9 at 1:14 Mariia Mykhailova 1,920

3

votes

1

answer

46

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Reversible crypto systems for use in the Grover's algorithm

algorithm quantum-gate grovers-algorithm cryptography

answered Apr 17 at 12:42 Mark S 758

4

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0

answers

96

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Is there a BQP algorithm for each level of the polynomial hierarchy PH?

algorithm complexity-theory bqp forrelation

modified Apr 20 at 15:48 Sanketh Menda 310

3

votes

0

answers

92

views

How to build a quantum circuit representing the Ising Model?

programming circuit-construction machine-learning

modified 2 days ago Craig Gidney 4,728

2

votes

1

answer

43

views

Calculating entries of unitary transformation

algorithm quantum-gate

answered Apr 10 at 6:31 Danylo Y 705

3

votes

1

answer

41

views

Drawing tangent vectors to the Bloch sphere with qutip

programming bloch-sphere qutip

modified 2 days ago glS 4,465

1

vote

1

answer

40

views

Using latest (GitHub) version of Qiskit as Python library

programming qiskit

answered Apr 9 at 13:38 Matthew Stypulkoski 181

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