User glS

6

30

votes

2

answers

3k

views

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

Nov 18 at 19:07 Squeamish Ossifrage 908

8

26

votes

4

answers

923

views

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

complexity-theory speedup quantum-advantage

May 15 '19 at 13:58 Sanchayan Dutta 13.7k

3

18

votes

1

answer

624

views

What protocols have been proposed to implement quantum RAMs?

quantum-memory

May 15 '19 at 14:58 Sanchayan Dutta 13.7k

4

17

votes

2

answers

3k

views

What is the difference between transmon and Xmon qubits?

physical-qubit architecture superconducting-quantum-computing

Jul 9 '19 at 7:03 Shariq 1

2

17

votes

4

answers

1k

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♦ 2,935

4

15

votes

4

answers

800

views

How should different quantum computing devices be compared?

architecture technical-standards nisq

Jan 1 '19 at 10:16 Sanchayan Dutta 13.7k

2

15

votes

5

answers

472

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 '18 at 14:14 Sanchayan Dutta 13.7k

1

15

votes

1

answer

277

views

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

speedup annealing

Apr 2 '18 at 19:20 glS 11k

1

13

votes

1

answer

432

views

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

quantum-gate architecture physical-realization hamiltonian-simulation dynamics

Dec 23 '18 at 14:17 Sanchayan Dutta 13.7k

3

11

votes

1

answer

721

views

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

speedup fault-tolerance

Aug 13 '18 at 6:25 DaftWullie 32.6k

2

10

votes

1

answer

175

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 2,275

1

8

votes

1

answer

169

views

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

quantum-state bloch-sphere state-space-geometry

Jul 26 at 11:57 glS 11k

8

votes

1

answer

97

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 13.7k

1

8

votes

2

answers

393

views

Does quantum control allow to implement any gate?

quantum-gate quantum-control

Apr 23 '18 at 11:10 agaitaarino 3,196

7

votes

1

answer

213

views

Does the trace distance have a geometrical interpretation?

quantum-state bloch-sphere state-space-geometry trace-distance

Nov 7 at 19:20 Greg Kuperberg 981

6

votes

2

answers

296

views

What is the difference between the “Fubini-Study distances” $\arccos|\langle\psi|\phi\rangle|$ and $\sqrt{1-|\langle\psi|\phi\rangle|}$?

fidelity state-space-geometry

Jul 2 at 13:32 David Bar Moshe 1,619

1

6

votes

4

answers

389

views

Are there Bell-like violations that can be observed without collecting statistics?

quantum-information resource-request bell-experiment non-locality

Jul 1 at 12:26 Mateus Araújo 211

6

votes

1

answer

189

views

Why is the probability vector of a uniformly random state $\sum_i\alpha_i|i\rangle$ uniformly random only if $\alpha_i\in\mathbb C$?

quantum-state mathematics

Nov 10 at 4:20 Greg Kuperberg 981

1

6

votes

1

answer

171

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 11k

6

votes

1

answer

102

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 11k

1

6

votes

2

answers

117

views

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

quantum-memory

Jun 18 '18 at 13:26 glS 11k

3

6

votes

0

answers

193

views

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

quantum-gate quantum-control

Mar 30 '18 at 11:52 glS 11k

3

5

votes

1

answer

114

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 locc-operation

Jul 27 at 12:31 glS 11k

2

5

votes

3

answers

103

views

What does the adjoint of a channel represent physically?

quantum-operation

Jul 16 at 23:39 Jonathan Trousdale 2,223

5

votes

2

answers

177

views

Do states with the same purity always have the same rank?

quantum-state mathematics

Dec 11 at 15:39 glS 11k

5

votes

1

answer

198

views

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

quantum-operation

Aug 12 '19 at 8:35 DaftWullie 32.6k

5

votes

1

answer

202

views

What is the hidden subgroup in Simon's problem?

algorithm simons-algorithm hidden-subgroup-problem

Mar 17 '19 at 21:01 glS 11k

5

votes

1

answer

154

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 621

4

votes

1

answer

76

views

Why does full state reconstruction require at least $N+1$ MUBs?

quantum-state tomography mub

Aug 24 at 9:37 glS 11k

4

votes

1

answer

53

views

Are inseparable states with positive partial transposition nonlocal?

entanglement non-locality nonclassicality

Jul 17 at 12:11 Mateus Araújo 211

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60 Questions

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

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

What protocols have been proposed to implement quantum RAMs?

What is the difference between transmon and Xmon qubits?

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

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?

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

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

What kinds of ions do trapped ion quantum computers use?

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

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?

Does the trace distance have a geometrical interpretation?

What is the difference between the “Fubini-Study distances” $\arccos|\langle\psi|\phi\rangle|$ and $\sqrt{1-|\langle\psi|\phi\rangle|}$?

Are there Bell-like violations that can be observed without collecting statistics?

Why is the probability vector of a uniformly random state $\sum_i\alpha_i|i\rangle$ uniformly random only if $\alpha_i\in\mathbb C$?

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?

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

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

What does the adjoint of a channel represent physically?

Do states with the same purity always have the same rank?

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 does full state reconstruction require at least $N+1$ MUBs?

Are inseparable states with positive partial transposition nonlocal?