Hottest Questions Today

2

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

answered 26 mins ago Niel de Beaudrap 6,220

1

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1

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27

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Why do we need reversibility

quantum-gate quantum-state

answered 29 mins ago DaftWullie 15.8k

1

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1

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33

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

quantum-information

modified 4 hours ago Victory Omole 470

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17

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

ibm-q-experience

asked 17 hours ago Ualikhan 28

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1

answer

56

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Quantum representation of cube

quantum-state

answered yesterday DaftWullie 15.8k

3

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0

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29

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Counting in Q#: number of solutions

algorithm programming grovers-algorithm q#

modified yesterday Fabrizio Riguzzi 16

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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

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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

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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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

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 2 days ago glS 4,465

4

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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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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

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0

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51

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Grover's Algorithm returns skewed probability distribution

programming qiskit measurement grovers-algorithm

modified 2 days ago Woody1193 174

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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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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

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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

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0

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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

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

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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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

2

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2

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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

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

5

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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

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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

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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

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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

4

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1

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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

1

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1

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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

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

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

3

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1

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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

4

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1

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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

3

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0

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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

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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

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

3

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1

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132

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Quantum Toffoli gate equation

quantum-gate tensor-product

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

3

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1

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98

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How to prove universality for a set of gates?

quantum-gate universal-gates

modified Apr 12 at 6:07 DaftWullie 15.8k

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

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

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

answer

37

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How do you start a simulation with a random initial state in Cirq?

programming cirq

modified Apr 12 at 18:21 Sanchayan Dutta♦ 6,706

3

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1

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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

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

2

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1

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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

2

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1

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43

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Calculating entries of unitary transformation

algorithm quantum-gate

answered Apr 10 at 6:31 Danylo Y 705

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 6,220

3

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0

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43

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Graphing the decoherence of qubits being used to perform an algorithm

programming qiskit decoherence ibmq

modified Apr 11 at 13:28 Matthew Stypulkoski 181

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