Quantum Computing Stack Exchange

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How should we interpret these quantum logic gates as physical observables?

answered 18 mins ago Niel de Beaudrap 6,220

1

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1

answer

27

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Why do we need reversibility

quantum-gate quantum-state

answered 21 mins ago DaftWullie 15.8k

1

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1

answer

32

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What's the difference between Kraus operators and measurement operators?

quantum-information

modified 3 hours ago Victory Omole 470

0

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0

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17

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What is the difference in computational power between qubit and bit(transistor)? [duplicate]

ibm-q-experience

asked 17 hours ago Ualikhan 28

3

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0

answers

29

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Counting in Q#: number of solutions

algorithm programming grovers-algorithm q#

modified yesterday Fabrizio Riguzzi 16

0

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1

answer

56

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Quantum representation of cube

quantum-state

answered yesterday DaftWullie 15.8k

4

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0

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43

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Encoding bosonic degrees of freedom

quantum-state mathematics

modified yesterday mavzolej 121

3

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0

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32

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Does HHL implementation requires a priori eigendecomposition?

algorithm hhl-algorithm

modified yesterday Sanchayan Dutta♦ 6,706

3

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1

answer

41

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Drawing tangent vectors to the Bloch sphere with qutip

programming bloch-sphere qutip

modified yesterday glS 4,465

2

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2

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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

14

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4

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695

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Grover's algorithm: where is the list?

grovers-algorithm

modified 2 days ago Sanchayan Dutta♦ 6,706

3

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0

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92

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How to build a quantum circuit representing the Ising Model?

programming circuit-construction machine-learning

modified 2 days ago Craig Gidney 4,728

2

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0

answers

51

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Grover's Algorithm returns skewed probability distribution

programming qiskit measurement grovers-algorithm

modified 2 days ago Woody1193 174

3

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1

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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

8

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2

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264

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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

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

7

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2

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273

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Grover's Algorithm - why do we floor?

grovers-algorithm

modified Apr 23 at 5:05 Sanchayan Dutta♦ 6,706

2

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0

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29

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What does it mean to have 2000 qubits and 6016 couplers?

d-wave annealing optimization graph-states

modified Apr 22 at 22:16 Roma Karageorgievich 111

1

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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

3

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0

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15

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Finding separable decompositions of bipartite X-states using the methodology of Li and Qiao

quantum-state quantum-information entanglement

modified Apr 22 at 19:11 Sanchayan Dutta♦ 6,706

-1

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0

answers

17

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What is the physics behind a quantum classifier for labeling quantum states? [on hold]

quantum-state circuit-construction machine-learning

asked Apr 22 at 18:52 Enrique Segura 14

2

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1

answer

38

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Eigenstate of unitary operator used for Order-Finding

mathematics nielsen-and-chuang phase-estimation

modified Apr 21 at 12:13 Sanchayan Dutta♦ 6,706

4

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0

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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

2

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1

answer

39

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What are the ranges of the four $q$ parameters in the magic simplex of Bell states formula?

quantum-information entanglement density-matrix photonics

answered Apr 19 at 17:59 AHusain 2,034

2

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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

5

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1

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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

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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

1

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1

answer

43

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Correct way of expressing a measurement in a different computational basis

algorithm mathematics measurement deutsch-jozsa-algorithm

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

8

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1

answer

207

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What are the implications of Bremermann's limit for quantum computing?

speedup

modified Apr 17 at 23:42 Glorfindel 251

4

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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

4

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2

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509

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How to superpose two composite qubit states?

quantum-state circuit-construction superposition

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

13

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1

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900

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What is the difference between quantum annealing and adiabatic quantum computation models?

annealing models adiabatic-model

modified Apr 17 at 13:31 Nelimee 1,775

3

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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

9

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1

answer

135

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Proof of an Holevo information inequality

quantum-information entropy

modified Apr 17 at 11:30 glS 4,465

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

2

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1

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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

1

vote

1

answer

37

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Burnside Decomposition in Kuperberg's Hidden Shift

mathematics fourier-sampling hidden-subgroup-problem

modified Apr 15 at 15:25 Sanchayan Dutta♦ 6,706

2

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1

answer

74

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Experiment runtime on IBMQ

programming ibm-q-experience ibmq

answered Apr 15 at 13:19 Matthew Stypulkoski 181

1

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1

answer

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

3

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0

answers

70

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What can be some bachelor thesis ideas in quantum random walks?

algorithm research quantum-walks

modified Apr 15 at 10:44 Sanchayan Dutta♦ 6,706

2

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1

answer

31

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How does Steane code use the classical Hamming code for error correction?

resource-request error-correction

modified Apr 15 at 10:29 Sanchayan Dutta♦ 6,706

4

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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

3

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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

3

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1

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93

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Creating an ansatz for variational quantum algorithms?

algorithm cirq

modified Apr 14 at 19:26 Enrique Segura 14

4

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1

answer

89

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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

5

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0

answers

98

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Proof of the optimality of Grover's algorithm

algorithm grovers-algorithm nielsen-and-chuang

modified Apr 14 at 15:22 glS 4,465

4

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1

answer

104

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How to create the oracle matrix in Grover's algorithm?

algorithm programming grovers-algorithm pyquil

modified Apr 14 at 14:49 glS 4,465

3

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1

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81

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Proof that Grover's operator can be written as $D_N=-H_n R_N H_n$

algorithm mathematics grovers-algorithm

modified Apr 14 at 14:45 glS 4,465

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