Hottest Questions Today

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Simple proof that $(U \otimes V)(|x\rangle \otimes |y\rangle) = U|x\rangle \otimes V|y\rangle$?

matrix-representation mathematics

answered 6 hours ago cnada 1,063

1

vote

1

answer

11

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Q# How to use a namespace in another project?

q#

answered 7 hours ago Mariia Mykhailova 947

3

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0

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12

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Can we use quantum machines to reduce space complexity of deterministic turing machines?

complexity-theory memory-space

modified 8 hours ago Blue 5,458

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0

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22

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Does the GLOA have any advantage over the Solovay-Kitaev algorithm?

quantum-algorithms complexity-theory solovay-kitaev

modified 9 hours ago Blue 5,458

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0

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30

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When and where was the first use of the term Chimera?

architecture d-wave quantum-annealing chimera embedding

modified 5 hours ago user1271772 4,732

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30

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How to construct a quantum gate producing 1 if r divides x, 0 otherwise?

quantum-gate

modified 7 hours ago Craig Gidney 2,637

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1

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43

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Does entanglement correlate qubits a $100\%$ of the time?

quantum-entanglement

modified 12 hours ago glS 3,206

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60

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What happens when I input two qubits starting at state $|00\rangle$ into a hadamard gate

quantum-computer quantum-gate

modified 10 hours ago John Jepson 23

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84

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What is the matrix for the operator that implements a function to tell the parity of its argument?

quantum-gate matrix-representation

modified yesterday R. Chopin 360

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1

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28

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What's the meaning of applying $U_{\text{div}}$ to a register in superposition?

superposition

answered yesterday nikojpapa 62

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35

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Why do we need Shor's algorithm to find the period of a function?

shors-algorithm simons-algorithm

modified yesterday Blue 5,458

4

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3

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53

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What's an example of building a circuit $U_f$ that implements a simple function $f$?

quantum-gate

modified yesterday cnada 1,063

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27

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Discrepancy regarding Husimi Probability distribution

quantum-dynamics spin-qubits

modified yesterday Blue 5,458

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1

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27

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Solving a circuit implementing a two-level unitary operation

quantum-gate circuit-construction

answered 2 days ago AHusain 800

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54

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Resources to keep a track on open Ph.D. positions in specific sub-fields/topics of quantum computing

resource-request

modified yesterday Blue 5,458

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0

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66

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Physics World - Questioning quantum speed [on hold]

quantum-speedup

modified 2 days ago GRSmith 11

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15

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Applying Group Leaders Optimization to Quantum Belief Systems

quantum-gate gate-synthesis universal-gates optimization

modified 2 days ago meowzz 1,096

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2

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17

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How does the stated Pauli decomposition for $\operatorname{CP\cdot A\cdot CP}$ arise?

quantum-gate gate-synthesis pauli-matrices

modified 2 days ago AHusain 800

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2

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40

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Why does a rotation of $\pi/2$ on $|1\rangle$ yield $i|1\rangle$?

quantum-gate

answered Oct 18 at 20:28 Dyon J Don Kiwi van Vreumingen 312

4

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2

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68

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Do the probability amplitudes of the superposition state produced by the QFT transform convey useful information?

quantum-algorithms quantum-information shors-algorithm quantum-fourier-transform

answered Oct 18 at 12:06 glS 3,206

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3

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134

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Quantum Computing Project

quantum-algorithms

answered Oct 17 at 19:57 AHusain 800

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1

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52

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Quantum teleportation: second classical bit for removing entanglement?

quantum-entanglement quantum-communication

modified Oct 18 at 16:08 user1271772 4,732

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3

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94

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How is computation done in a 2D surface code array?

quantum-error-correction

modified Oct 18 at 10:22 Niel de Beaudrap 4,916

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62

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Understanding the Group Leaders Optimization Algorithm

quantum-gate gate-synthesis

modified Oct 17 at 23:05 Blue 5,458

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20

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Why does Fourier sampling allow to efficiently recover hidden subgroups?

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

asked Oct 18 at 15:28 glS 3,206

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13

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How to compute the tensor product in QCL?

quantum-programming

modified Oct 18 at 14:57 R. Chopin 360

5

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2

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56

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Simulation vs Construction of Fredkin gate with Toffoli gates

quantum-gate circuit-construction

modified Oct 15 at 19:52 Niel de Beaudrap 4,916

5

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1

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44

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Efficiently performing controlled rotations in HHL

quantum-algorithms hhl-algorithm

answered Oct 16 at 10:03 DaftWullie 9,106

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3

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76

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Calculating measurement result of quantum swap circuit

quantum-gate circuit-model measurement

modified Oct 16 at 14:00 user1271772 4,732

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2

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36

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How to run algorithms on IBMQ via Qiskit-Aqua?

qiskit optimization

answered Oct 18 at 10:01 Filip Wudarski 51

2

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0

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21

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Weak Fourier Sampling vs Strong Fourier Sampling?

quantum-fourier-transform fourier-sampling

modified Oct 18 at 16:05 user1271772 4,732

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1

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48

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Why does Grover's search invert about the mean?

grovers-algorithm

modified Oct 15 at 4:34 Craig Gidney 2,637

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1

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40

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Can quantum computers be clustered together?

quantum-computer architecture

modified Oct 16 at 0:07 Henry WH Hack v2.1.2 106

115

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14

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25k

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Is quantum computing just pie in the sky?

quantum-computer classical-computing history applications

modified Oct 6 at 15:32 user1271772 4,732

2

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2

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129

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Many-Worlds Interpretation and GHZ States

qubit quantum-entanglement

answered Oct 16 at 7:22 DaftWullie 9,106

2

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0

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45

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Simulating Read only QRAM (constructing an oracle)

quantum-algorithms quantum-gate quantum-entanglement qiskit

modified yesterday Blue 5,458

6

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3

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64

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$R_z$ gate representations

quantum-algorithms quantum-gate circuit-model

modified Oct 13 at 10:54 user1271772 4,732

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2

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110

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Do any educational quantum computing toys or devices exist?

resource-request photonics

modified Oct 11 at 1:21 ahelwer 760

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0

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20

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Qiskit SDK problem

qiskit

modified Oct 15 at 13:01 Blue 5,458

3

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2

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79

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Are the squared absolute values of the eigenvalues of a unitary matrix always 1?

phase-estimation

modified Oct 10 at 16:34 user1271772 4,732

6

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1

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92

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Depolarizing channel implementation on IBM Q

ibm-q-experience noise quantum-channel

modified Oct 16 at 2:57 Mathophile-Mathochist 90

5

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1

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61

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Relating min-entropy with conditional entropy

quantum-entanglement quantum-information

answered Oct 15 at 20:01 John Watrous 969

12

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3

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82

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Connection between stabilizer generators and parity check matrices in the Steane code

quantum-error-correction stabilizer-code nielsen-and-chuang

modified Oct 10 at 20:13 Adam 109

6

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1

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192

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What's a Qubit on D-Wave 2000Q?

d-wave

modified Oct 12 at 19:52 Mithrandir24601♦ 2,131

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101

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Does the D-Wave 2000Q satisfy DiVincenzo's criteria?

quantum-computer architecture d-wave adiabatic-model scalability

modified Oct 12 at 19:54 Mithrandir24601♦ 2,131

6

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1

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61

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Relation between $\mathrm{QMA}$ and $\mathrm{P^{QMA}}$

complexity-theory qma

modified Oct 9 at 8:18 Niel de Beaudrap 4,916

4

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1

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40

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Suggest, partly based upon limited numerical results, possible “elegant” exact formulas for Bures two-qubit separability probability

quantum-entanglement quantum-information density-matrix

modified Oct 12 at 17:35 Paul B. Slater 166

4

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3

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457

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What's an use case of the inner product between two q-bits in a quantum algorithm?

quantum-algorithms

modified Oct 1 at 16:56 Aman 127

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