Quantum Computing Stack Exchange

3

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3

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46

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

quantum-gate

modified 3 hours ago cnada 1,008

2

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0

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42

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Simulating Read only QRAM (constructing an oracle)

modified 3 hours ago Blue 5,433

4

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0

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18

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Discrepancy regarding Husimi Probability distribution

quantum-dynamics spin-qubits

modified 3 hours ago Blue 5,433

3

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1

answer

19

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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 3 hours ago Blue 5,433

2

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0

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53

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Physics World - Questioning quantum speed [on hold]

quantum-speedup

modified 12 hours ago GRSmith 11

0

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1

answer

23

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Solving a circuit implementing a two-level unitary operation

quantum-gate circuit-construction

answered 13 hours ago AHusain 790

1

vote

1

answer

11

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Applying Group Leaders Optimization to Quantum Belief Systems

quantum-gate gate-synthesis universal-gates optimization

modified 14 hours ago meowzz 1,096

0

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2

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15

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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 14 hours ago AHusain 790

7

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1

answer

363

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Practical implementation of Hamiltonian Evolution

quantum-algorithms quantum-gate hhl-algorithm hamiltonian-simulation

modified 20 hours ago DaftWullie 9,096

2

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3

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64

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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

answered yesterday cnada 1,008

1

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2

answers

35

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

quantum-gate

answered yesterday Dyon J Don Kiwi van Vreumingen 192

0

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0

answers

25

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Where can we find subjects propositions for PhD in Quantum Computing?

resource-request

asked yesterday cnada 1,008

2

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1

answer

48

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Quantum teleportation: second classical bit for removing entanglement?

quantum-entanglement quantum-communication

modified yesterday user1271772 4,708

2

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0

answers

21

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Weak Fourier Sampling vs Strong Fourier Sampling?

quantum-fourier-transform fourier-sampling

modified yesterday user1271772 4,708

2

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1

answer

41

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Confusion over tensor products in sympy.physics.quantum.qubit (in Python)

quantum-programming tensor-product

modified yesterday Community♦ 1

1

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0

answers

16

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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 yesterday glS 3,156

0

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0

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13

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How to compute the tensor product in QCL?

quantum-programming

modified yesterday R. Chopin 314

4

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2

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66

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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 yesterday glS 3,156

8

votes

3

answers

93

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

quantum-error-correction

modified yesterday Niel de Beaudrap 4,906

2

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2

answers

35

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How to run algorithms on IBMQ via Qiskit-Aqua?

qiskit optimization

answered 2 days ago Filip Wudarski 51

4

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1

answer

55

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Understanding the Group Leaders Optimization Algorithm

quantum-gate gate-synthesis

modified 2 days ago Blue 5,433

4

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3

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133

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Quantum Computing Project

quantum-algorithms

answered 2 days ago AHusain 790

2

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3

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74

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Calculating measurement result of quantum swap circuit

quantum-gate circuit-model measurement

modified Oct 16 at 14:00 user1271772 4,708

5

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1

answer

44

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Efficiently performing controlled rotations in HHL

quantum-algorithms hhl-algorithm

answered Oct 16 at 10:03 DaftWullie 9,096

2

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2

answers

123

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Many-Worlds Interpretation and GHZ States

qubit quantum-entanglement

answered Oct 16 at 7:22 DaftWullie 9,096

6

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1

answer

90

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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

1

vote

1

answer

39

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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

5

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1

answer

61

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Relating min-entropy with conditional entropy

quantum-entanglement quantum-information

answered Oct 15 at 20:01 John Watrous 969

5

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2

answers

55

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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 4,906

12

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1

answer

890

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What is meant by “Noisy Intermediate-Scale Quantum” (NISQ) technology?

quantum-computer terminology

modified Oct 15 at 17:29 dln.sndrs 1

0

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0

answers

20

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Qiskit SDK problem

qiskit

modified Oct 15 at 13:01 Blue 5,433

18

votes

4

answers

2k

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Is there any general statement about what kinds of problems can be solved more efficiently using a quantum computer?

quantum-computer quantum-algorithms quantum-speedup complexity-theory

answered Oct 15 at 12:39 not2qubit 111

3

votes

1

answer

46

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Why does Grover's search invert about the mean?

grovers-algorithm

modified Oct 15 at 4:34 Craig Gidney 2,602

41

votes

5

answers

3k

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What programming languages are available for quantum computers?

quantum-programming

modified Oct 15 at 3:45 user1271772 4,708

6

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3

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63

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$R_z$ gate representations

quantum-algorithms quantum-gate circuit-model

modified Oct 13 at 10:54 user1271772 4,708

0

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1

answer

78

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How can I crack 32 bit RSA Encryption? [closed]

quantum-computer d-wave ibm-q-experience shors-algorithm

modified Oct 12 at 21:33 user1271772 4,708

9

votes

1

answer

99

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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

answer

192

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

d-wave

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

4

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1

answer

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

6

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1

answer

103

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How can I get access to IBM Q 20 Tokyo and IBM Q 20 Austin?

ibm-q-experience

modified Oct 12 at 13:00 Community♦ 1

7

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2

answers

110

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Do any educational quantum computing toys or devices exist?

resource-request photonics

modified Oct 11 at 1:21 ahelwer 720

4

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0

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60

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In D-Wave's universal quantum computer, why does the YY term have to be driven along with the linear X term?

quantum-computer architecture d-wave superconducting-quantum-computing adiabatic-model

modified Oct 10 at 21:48 user1271772 4,708

12

votes

3

answers

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

3

votes

2

answers

78

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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 4,708

3

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2

answers

92

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What do “hyperparallel algorithm” and “hyperentangled state” mean?

quantum-algorithms quantum-state

modified Oct 10 at 9:32 glS 3,156

5

votes

1

answer

66

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Transmons and cooper pair box qubits: two islands or a single island and a reservoir

quantum-computer qubit architecture superconducting-quantum-computing

modified Oct 9 at 16:56 user1271772 4,708

12

votes

0

answers

129

views

Explicit Conversion Between Universal Gate Sets

quantum-gate gate-synthesis universal-gates

modified Oct 9 at 9:12 DaftWullie 9,096

2

votes

1

answer

47

views

How to make “random U3” in QASM?

quantum-programming qasm

answered Oct 9 at 8:41 James Wootton♦ 5,487

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