User glS

7

27

votes

4

answers

641

views

Are there problems in which quantum computers are known to provide an exponential advantage?

May 15 at 13:58 Sanchayan Dutta 8,366

4

26

votes

2

answers

2k

views

How is the oracle in Grover's search algorithm implemented?

complexity-theory circuit-construction algorithm

May 15 at 14:28 Sanchayan Dutta 8,366

2

17

votes

4

answers

654

views

Why can the Discrete Fourier Transform be implemented efficiently as a quantum circuit?

algorithm speedup quantum-fourier-transform

Aug 7 '18 at 21:32 heather♦ 2,076

2

16

votes

1

answer

383

views

What protocols have been proposed to implement quantum RAMs?

quantum-memory

May 15 at 14:58 Sanchayan Dutta 8,366

4

15

votes

4

answers

637

views

How should different quantum computing devices be compared?

architecture technical-standards nisq

Jan 1 at 10:16 Sanchayan Dutta 8,366

2

15

votes

5

answers

381

views

Why do error correction protocols only work when the error rates are already significantly low to begin with?

error-correction fault-tolerance

Dec 23 at 14:14 Sanchayan Dutta 8,366

1

15

votes

1

answer

221

views

How long does quantum annealing take to find the solution to a given problem?

speedup annealing

Apr 2 '18 at 19:20 glS 6,162

3

14

votes

2

answers

1k

views

What is the difference between transmon and Xmon qubits?

physical-qubit architecture superconducting-quantum-computing

Jul 9 at 7:03 Shariq 1

11

votes

1

answer

346

views

How are quantum gates realised, in terms of the dynamic?

quantum-gate architecture physical-realization hamiltonian-simulation dynamics

Dec 23 at 14:17 Sanchayan Dutta 8,366

2

10

votes

1

answer

123

views

What kinds of ions do trapped ion quantum computers use?

physical-realization architecture experiment ion-trap-quantum-computing

Mar 30 '18 at 14:22 pyramids 1,860

3

9

votes

1

answer

405

views

How are magic states defined in the context of quantum computation?

speedup fault-tolerance

Aug 13 '18 at 6:25 DaftWullie 21.3k

8

votes

1

answer

81

views

Why does (almost) every pair of Hamiltonians generate, through repeated commutation, the whole space of Hermitian matrices?

simulation

Jun 13 '18 at 5:17 Sanchayan Dutta 8,366

1

8

votes

2

answers

363

views

Does quantum control allow to implement any gate?

quantum-gate quantum-control

Apr 23 '18 at 11:10 agaitaarino 1,976

7

votes

1

answer

116

views

Do pure states lie on a hypersphere in the Bloch representation?

quantum-state bloch-sphere state-space-geometry

Oct 10 at 10:36 glS 6,162

3

7

votes

0

answers

176

views

What is the difference between quantum control and quantum optimal control?

quantum-gate quantum-control

Mar 30 '18 at 11:52 glS 6,162

1

6

votes

1

answer

116

views

What are the preferred numerical methods to simulate the evolution of a state through a time-dependent Hamiltonian?

simulation dynamics

Jul 30 '18 at 15:50 glS 6,162

6

votes

1

answer

86

views

Computing of the action of the amplification operator $\mathbf Q$ over $|\Psi_i\rangle$ in the quantum amplitude amplification algorithm

algorithm amplitude-amplification

Jul 24 '18 at 16:41 glS 6,162

6

votes

2

answers

95

views

Are bucket-brigate (q)RAM architectures also advantageous in the classical case?

quantum-memory

Jun 18 '18 at 13:26 glS 6,162

5

votes

1

answer

71

views

Do the eigenvalues of the Choi matrix have any direct physical interpretation?

quantum-operation quantum-channel

Aug 12 at 8:35 DaftWullie 21.3k

5

votes

1

answer

92

views

What is the hidden subgroup in Simon's problem?

algorithm simons-algorithm hidden-subgroup-problem

Mar 17 at 21:01 glS 6,162

5

votes

1

answer

115

views

Why does the quantum linear inversion algorithm allow to implement $e^{-ig(\rho)}$ efficiently using multiple copies of $\rho$?

algorithm hhl-algorithm

Jul 11 '18 at 7:17 biryani 521

2

4

votes

1

answer

56

views

Why can any LOCC operation be written as $\sum_k (A_k\otimes B_k)\rho(A_k^\dagger\otimes B_k^\dagger)$?

quantum-operation quantum-channel

Aug 13 at 11:11 Norbert Schuch 1,813

4

votes

0

answers

21

views

Construction of optimal ensemble to show quantum steerability

entanglement nonclassicality

Feb 12 at 19:32 glS 6,162

4

votes

1

answer

109

views

Why does Fourier sampling allow to efficiently recover hidden subgroups?

algorithm quantum-fourier-transform fourier-sampling hidden-subgroup-problem

Jan 20 at 9:34 Sanchayan Dutta 8,366

4

votes

1

answer

134

views

Why is the $N$-qubit stabilizer group abelian?

error-correction stabilizer-code stabilizer-state

Oct 25 '18 at 20:25 Niel de Beaudrap 7,631

3

votes

0

answers

17

views

Are inseparable states with positive partial transposition nonlocal?

entanglement non-locality nonclassicality

Sep 11 at 8:51 glS 6,162

3

votes

1

answer

120

views

What is the average value of $|c_i\bar c_j|$ for a random state $|\psi\rangle=\sum_i c_i|i\rangle$?

quantum-state density-matrix

Aug 19 at 15:44 glS 6,162

3

votes

2

answers

120

views

Do the Kraus operators of a CPTP channel need to be orthogonal?

quantum-operation quantum-channel

Aug 8 at 15:13 glS 6,162

3

votes

3

answers

118

views

How are orthogonal sets of pure states arranged in state space?

mathematics bloch-sphere state-space-geometry

Jun 6 at 18:06 Danylo Y 1,830

1

3

votes

1

answer

47

views

What are nontrivial examples of $n$-sharable bipartite states?

quantum-information entanglement partial-trace

Jun 5 at 7:52 DaftWullie 21.3k

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35 Questions

Are there problems in which quantum computers are known to provide an exponential advantage?

How is the oracle in Grover's search algorithm implemented?

Why can the Discrete Fourier Transform be implemented efficiently as a quantum circuit?

What protocols have been proposed to implement quantum RAMs?

How should different quantum computing devices be compared?

Why do error correction protocols only work when the error rates are already significantly low to begin with?

How long does quantum annealing take to find the solution to a given problem?

What is the difference between transmon and Xmon qubits?

How are quantum gates realised, in terms of the dynamic?

What kinds of ions do trapped ion quantum computers use?

How are magic states defined in the context of quantum computation?

Why does (almost) every pair of Hamiltonians generate, through repeated commutation, the whole space of Hermitian matrices?

Does quantum control allow to implement any gate?

Do pure states lie on a hypersphere in the Bloch representation?

What is the difference between quantum control and quantum optimal control?

What are the preferred numerical methods to simulate the evolution of a state through a time-dependent Hamiltonian?

Computing of the action of the amplification operator $\mathbf Q$ over $|\Psi_i\rangle$ in the quantum amplitude amplification algorithm

Are bucket-brigate (q)RAM architectures also advantageous in the classical case?

Do the eigenvalues of the Choi matrix have any direct physical interpretation?

What is the hidden subgroup in Simon's problem?

Why does the quantum linear inversion algorithm allow to implement $e^{-ig(\rho)}$ efficiently using multiple copies of $\rho$?

Why can any LOCC operation be written as $\sum_k (A_k\otimes B_k)\rho(A_k^\dagger\otimes B_k^\dagger)$?

Construction of optimal ensemble to show quantum steerability

Why does Fourier sampling allow to efficiently recover hidden subgroups?

Why is the $N$-qubit stabilizer group abelian?

Are inseparable states with positive partial transposition nonlocal?

What is the average value of $|c_i\bar c_j|$ for a random state $|\psi\rangle=\sum_i c_i|i\rangle$?

Do the Kraus operators of a CPTP channel need to be orthogonal?

How are orthogonal sets of pure states arranged in state space?

What are nontrivial examples of $n$-sharable bipartite states?