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1

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3

answers

32

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Controlled Z gate acting on 3 qubits in matrix form

quantum-gate matrix-representation

answered 2 hours ago DaftWullie 18k

1

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0

answers

16

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Understanding the “Controlled Rotations” used in the HHL algorithm

algorithm hhl-algorithm

modified 6 hours ago IntegrateThis 136

3

votes

0

answers

27

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Bell State 11 not working for parity curve

programming quantum-information qiskit ibm-q-experience bell-experiment

modified 12 mins ago thewolfaxe 16

3

votes

1

answer

14

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2 ways to do the three qubits bit-flip code

error-correction

answered 13 hours ago James Wootton 7,271

4

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1

answer

40

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Using the HHL algorithm to compute $A |b \rangle$ instead of $A^{-1} |b \rangle$

algorithm hhl-algorithm

modified 18 hours ago glS 5,205

4

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0

answers

21

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Motivation for the definition of k-distillability

quantum-information entanglement mathematics

modified 17 hours ago Sanchayan Dutta 7,836

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1

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31

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$n$ qubit vs. a $d=2^n$ qudit states and measurements

quantum-state measurement qudit

answered 19 hours ago glS 5,205

3

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0

answers

16

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How many two-qubit gates required for general N-qubit unitary?

circuit-construction universal-gates

asked 23 hours ago as2457 28

5

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0

answers

62

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Calculating power of a quantum computer — RSA

cryptography quantum-operation

modified yesterday Niel de Beaudrap 6,775

4

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1

answer

100

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Understanding the classification of quantum states based on partial transposition: representations of the bipartite density matrix

entanglement density-matrix

modified yesterday Sanchayan Dutta 7,836

2

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2

answers

438

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How to compute the inverse of an operation in Q#?

programming q#

answered 2 days ago Chris Granade 203

1

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2

answers

39

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CX gate with Hadamard

quantum-gate quantum-state

modified 13 hours ago Mithrandir24601♦ 2,541

1

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1

answer

35

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Construction of Phase Shift Operation used in Quantum Search

mathematics grovers-algorithm nielsen-and-chuang

modified yesterday P_Gate 306

2

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0

answers

19

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How to prove the following bosonic entanglement expression?

quantum-information entanglement entropy entanglement-witness

modified 13 hours ago Mithrandir24601♦ 2,541

2

votes

1

answer

41

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IBM Slack links broken

ibm-q-experience ibm

answered yesterday met927 86

10

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2

answers

908

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Is swap gate equivalent to just exchanging the wire of the two qubits?

quantum-gate

answered Jun 14 at 19:39 LambdaBeta 173

3

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1

answer

47

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Implementing a complex circuit for a Szegedy quantum walk in qiskit

quantum-gate programming circuit-construction qiskit

modified 2 days ago Nelimee 1,980

5

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1

answer

21

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If the quantum Fourier transform efficient if only one control-phase is allowed in the gate set

quantum-gate quantum-fourier-transform universal-gates

answered 2 days ago DaftWullie 18k

5

votes

1

answer

43

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Equivalent determinant condition for Peres-Horodecki criteria

entanglement mathematics density-matrix matrix-representation

modified yesterday DaftWullie 18k

1

vote

0

answers

26

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Superdense coding projects

resource-request superdense-coding

modified 2 days ago Sanchayan Dutta 7,836

7

votes

2

answers

166

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+100

Clarification of the “Calculations” section of the (HHL09) paper

algorithm hhl-algorithm

modified yesterday Sanchayan Dutta 7,836

7

votes

2

answers

118

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How to program a controlled Hadamard-Hadamard gate?

programming circuit-construction qiskit

answered Jun 14 at 13:16 James Wootton 7,271

3

votes

1

answer

60

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Quantum Computing Project Inquiry

resource-request research

modified yesterday Sanchayan Dutta 7,836

2

votes

0

answers

31

views

GHZ - measuring particles

quantum-state entanglement measurement cryptography

modified 2 days ago Sanchayan Dutta 7,836

4

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1

answer

57

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How to find a common eigenstate of commuting operators?

quantum-state programming quantum-information

modified Jun 15 at 8:39 Danylo Y 1,295

5

votes

1

answer

39

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Get result measurement into a circuit with Qiskit

qiskit error-correction

modified Jun 15 at 17:49 John Garmon 76

7

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2

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80

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Quantum channel representation of projective measurement

measurement nielsen-and-chuang quantum-channel projection-operator

modified Jun 13 at 17:29 glS 5,205

1

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1

answer

85

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Quantum secret Sharing using GHZ state paper

quantum-state entanglement measurement

modified Jun 14 at 7:53 Upstart 392

2

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1

answer

44

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Eliminating a term of a superposition state

algorithm quantum-state programming

modified Jun 14 at 13:45 Sanchayan Dutta 7,836

4

votes

1

answer

27

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Simulating a 3-local Hamiltonian Term

circuit-construction hamiltonian-simulation

answered Jun 14 at 7:26 DaftWullie 18k

2

votes

0

answers

36

views

Experiments stuck on VALIDATING ibmq_16_melbourne

ibm-q-experience

asked Jun 14 at 7:48 maxdevblock 21

4

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0

answers

35

views

What is the motivation for Weyl matrices in quantum information theory?

quantum-information entanglement mathematics

asked Jun 14 at 6:14 Sanchayan Dutta 7,836

3

votes

2

answers

59

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Amplitude suppression

amplitude-amplification

modified Jun 13 at 7:03 DaftWullie 18k

3

votes

1

answer

55

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Quantum Fourier Transform without SWAPs

quantum-gate circuit-construction quantum-fourier-transform

answered 2 days ago Nan 53

-1

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0

answers

31

views

IBM Q [Grover's Algorithm]

quantum-information

asked Jun 14 at 6:32 Manohar Manikkavasagam 6

4

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1

answer

22

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Quantum fidelity simplified formula while both of the density matrices are single qubit states

quantum-state quantum-information density-matrix quantum-channel

modified Jun 14 at 11:09 Yaoling Yang 25

4

votes

1

answer

42

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Quantum state where phase information is unknown

density-matrix decoherence

answered Jun 14 at 8:17 DaftWullie 18k

2

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2

answers

50

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How do I write a tensor product of conditional gates in matrix form?

quantum-gate matrix-representation tensor-product

modified Jun 12 at 22:14 AHusain 2,380

-3

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1

answer

39

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D-Flip Flop in FPGA's as quantum computer [closed]

classical-computing

answered Jun 13 at 20:11 Winterstorm D 1

1

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1

answer

28

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Perform quantum gate operations using state vectors and matrices

quantum-gate programming quantum-information

answered Jun 12 at 21:07 Mariia Mykhailova 2,630

6

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1

answer

137

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Question on state distinguishability

quantum-state

modified Jun 10 at 19:08 Danylo Y 1,295

8

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1

answer

75

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Is there a general method of expressing optimization problem as a Hamiltonian?

adiabatic-model optimization

modified Jun 11 at 15:45 bRost03 280

3

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1

answer

74

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Weeding out qubit states with leftmost qubit as 1

quantum-state ibm-q-experience projection-operator

modified Jun 11 at 8:51 Sanchayan Dutta 7,836

2

votes

1

answer

36

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What is Landauer’s principle?

quantum-information entropy

modified Jun 12 at 15:36 Sanchayan Dutta 7,836

5

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1

answer

55

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How to tell if the ground states of two Hamiltonians are solutions of the same optimization problem?

quantum-state adiabatic-model optimization

modified Jun 12 at 18:16 Niel de Beaudrap 6,775

5

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1

answer

64

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How to calculate the fidelity of a certain gate of a IBMQ device in Qiskit using randomized benchmarking/tomography?

programming qiskit fidelity tomography

modified yesterday James Wootton 7,271

2

votes

0

answers

41

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Grover search for basis states with complex coefficents and multiple marked states

programming grovers-algorithm

modified Jun 13 at 2:53 Zzy1130 95

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