Quantum Computing Stack Exchange

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3

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How to prepare a random 1-qubit superposition for data encoding

asked 12 mins ago Thommy257 101

0

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0

answers

3

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Measurement probability of a state from three hilbert spaces

measurement probability

asked 58 mins ago mikanim 195

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0

answers

6

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Grover's oracle

grovers-algorithm oracles

asked 1 hour ago Oilobobolus 153

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7

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QISKit not installing in PyCharm

qiskit

asked 1 hour ago Ray117 1

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1

answer

38

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Why is the local qasm_simulator significantly slower than the statevector_simulator?

qiskit programming vqe

modified 1 hour ago Community♦ 1

4

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3

answers

206

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Is the tensor product of two states commutative?

mathematics tensor-product textbook-and-exercises

modified 1 hour ago Mark S 4,273

4

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1

answer

48

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What is the general method for creating real gate sequences from mathematical algorithms?

quantum-gate algorithm

answered 4 hours ago BrockenDuck 624

0

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0

answers

24

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Measure qubit $q_0$ in some basis that remotely prepare in qubit $q_1$

circuit-construction ibm-q-experience

asked 10 hours ago heromano 187

1

vote

1

answer

29

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Implementing a SwapTest for samples with large numbers of features

circuit-construction

answered 10 hours ago Martin Vesely 7,753

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1

answer

16

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Is there any quantum gate that can change quantum hardware topology(architecture)?

quantum-gate qubit-mapping quantum hardware-topology

answered 11 hours ago Martin Vesely 7,753

2

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1

answer

56

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API error when trying to access IBM Quantum Computer using IBMQ API Token

programming qiskit ibm-q-experience

modified 12 hours ago luciano 1,465

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1

answer

31

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Is it better to initialize quantum circuits in Qiskit by passing QuantumRegister and ClassicalRegister objects?

qiskit

answered 12 hours ago luciano 1,465

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1

answer

53

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What exactly happening in QAOA in a general way?

optimization qaoa

modified 21 hours ago Faiyaz Hasan 107

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0

answers

24

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How to convert discrete quantum circuits to their continuous variable equivalents?

quantum-gate circuit-construction continuous-variable

modified 22 hours ago glS 12.2k

2

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2

answers

78

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How can I convert exponentials of pauli matrices to circuits of this form in Qiskit?

programming qiskit hamiltonian-simulation

modified yesterday viwosh 1

3

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1

answer

128

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How can we construct a control-control y-rotation (CCRy) gate in Qiskit?

programming quantum-gate qiskit

modified yesterday Faiyaz Hasan 107

0

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0

answers

17

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Symmetric Universal Quantum Cloning Machine (UQCM) N --> M for unknown states

qiskit quantum-circuit cloning

asked yesterday L. Lenzini 21

2

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1

answer

65

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Is the quantum state discrimination success probability always $\lambda_0\langle\mu(0),\rho_0\rangle+\lambda_1\langle\mu(1),\rho_1\rangle$?

information-theory state-discrimination

answered yesterday Mateus Araújo 693

3

votes

1

answer

36

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HHL algorithm, How to implement exp(iAt) gates?

algorithm hhl-algorithm phase-estimation

modified yesterday Adrien Suau 3,670

3

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1

answer

86

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What is the action of sandwiching an operator with two CNOT gates?

quantum-gate circuit-construction

modified yesterday glS 12.2k

1

vote

1

answer

38

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Why does $\sum_n \langle n|M_m\rho M_m^\dagger|n\rangle$ simplify to $\langle \psi|M_m^\dagger M_m|\psi\rangle$?

measurement textbook-and-exercises quantum-operation nielsen-and-chuang kraus-representation

modified yesterday glS 12.2k

2

votes

1

answer

57

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Is the order of the tensor product in $|\phi\rangle\otimes|\chi\rangle=|\chi\rangle\otimes|\phi\rangle$ relevant? [duplicate]

textbook-and-exercises tensor-product

modified yesterday glS 12.2k

1

vote

1

answer

23

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Can one easily compute the weight enumerator of a CSS code constructed from two binary codes $M_1,M_2$?

error-correction fault-tolerance

modified yesterday Markus Heinrich 928

1

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0

answers

26

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Qiskit: is there a quick way to work out the spherical coordinates for a given qubit statevector?

programming quantum-gate qiskit quantum-circuit

modified yesterday Martin Vesely 7,753

2

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1

answer

37

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Qiskit: how can you use a different state for each shot in a quantum circuit? [duplicate]

programming quantum-gate qiskit quantum-state quantum-circuit

modified yesterday Martin Vesely 7,753

1

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2

answers

35

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In quantum adiabatic simulation, is the $s$ in $(1-\frac{s}{T})H_{in}+\frac{s}{T} H_{cl}$ related to the $t$ in $e^{-iHt}$?

quantum-gate optimization annealing quantum-circuit

answered yesterday DaftWullie 35.7k

1

vote

1

answer

84

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How can I find the fidelity of preparation?

qiskit quantum-state ibm-q-experience fidelity state-preparation

modified yesterday Community♦ 1

3

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1

answer

107

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+50

Formal proof of Bell's inequality in CHSH form

bell-experiment non-locality

modified 2 days ago Mateus Araújo 693

2

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0

answers

55

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Getting Choi-matrix of a subsystem

programming qiskit quantum-operation

modified 2 days ago user1271772 8,162

6

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2

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385

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How can one argue that the $S$-gate is Clifford while $T$-gate is not?

quantum-gate clifford-group

modified 2 days ago glS 12.2k

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1

answer

25

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In VQE, what ansatz would be best used for a maximally entangled $n$-qubit $H$?

qiskit algorithm entanglement vqe

modified 2 days ago glS 12.2k

3

votes

1

answer

54

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What does the identity operator represent when computing $\langle\varphi|I\otimes Z|\varphi\rangle$?

mathematics measurement hamiltonian-simulation vqe

modified 2 days ago glS 12.2k

2

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1

answer

39

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Show algebraically that $U|0\rangle\otimes |0\rangle+U|1\rangle\otimes|1\rangle=|0\rangle\otimes U^T|0\rangle+|1\rangle\otimes U^T|1\rangle$

entanglement mathematics textbook-and-exercises bell-basis

modified 2 days ago glS 12.2k

2

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1

answer

110

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What is a good video resource for quantum computing?

resource-request

modified 2 days ago glS 12.2k

1

vote

0

answers

18

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Bell's experiment: checking the probabilities

textbook-and-exercises bell-basis bell-experiment non-locality

modified 2 days ago glS 12.2k

2

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1

answer

36

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What is the difference between SWAP & Bridge gates?

quantum-gate physical-qubit

modified 2 days ago glS 12.2k

4

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1

answer

39

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Is there an issue preventing people from scaling Grover's algorithm to larger numbers of qubits?

algorithm grovers-algorithm

modified 2 days ago glS 12.2k

2

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1

answer

35

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How does MCPhaseGate/MCU1Gate works internally in qiskit?

programming quantum-gate qiskit gate-synthesis

modified 2 days ago luciano 1,465

2

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0

answers

69

views

+50

How significant is achieving electronic transport in a single qubit at room temperature?

physical-realization physical-qubit

modified 2 days ago user2521987 83

0

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0

answers

32

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Implementation of remote state preparation circuit on IBM Quantum Experience [closed]

circuit-construction ibm-q-experience

modified 2 days ago heromano 187

0

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2

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40

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Phase Kickback - factoring Dirac representation

qiskit textbook-and-exercises

answered 2 days ago KAJ226 6,257

2

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1

answer

36

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How would I compute a density matrix of a 2 qubit mixed state?

quantum-gate mathematics textbook-and-exercises density-matrix nielsen-and-chuang

modified Feb 23 at 17:49 glS 12.2k

4

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1

answer

28

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Does $\frac{\Pi_A\otimes I_B}{\text{Tr}((\Pi_A\otimes I_B)\rho_{AB})}\rho_{AB}=\rho_{AB}$ hold for a state $\rho_{AB}$ and projector $\Pi_A$?

quantum-state textbook-and-exercises partial-trace projection-operator

modified Feb 23 at 17:46 glS 12.2k

2

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2

answers

96

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Qiskit: Taking a QUBO matrix into `qubit_op'

programming qiskit qaoa

answered Feb 23 at 16:06 bubba 31

25

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8

answers

8k

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Currently, what are the best structured courses available online on quantum computing?

resource-request

modified Feb 23 at 15:46 luciano 1,465

4

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1

answer

142

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Decomposing Hamiltonian into qubit model representation

algorithm quantum-advantage vqe

modified Feb 23 at 12:01 Community♦ 1

1

vote

2

answers

35

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Multiple Providers on IBMQ

programming qiskit ibm-q-experience ibm

answered Feb 23 at 11:44 Adrien Suau 3,670

5

votes

2

answers

198

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Stabilizer circuit synthesis via Clifford gates

circuit-construction stabilizer-code

modified Feb 23 at 10:00 Community♦ 1

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