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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

16

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

answered 11 hours ago Martin Vesely 7,753

4

votes

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

2

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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?

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answered 12 hours ago luciano 1,465

1

vote

1

answer

29

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Implementing a SwapTest for samples with large numbers of features

circuit-construction

answered 11 hours ago Martin Vesely 7,753

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

2

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0

answers

24

views

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

quantum-gate circuit-construction continuous-variable

modified 22 hours ago glS 12.2k

3

votes

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

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

2

votes

1

answer

65

views

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

1

vote

1

answer

38

views

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

0

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0

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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

1

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0

answers

18

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+50

Bell's experiment: checking the probabilities

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

modified 10 mins ago Oilobobolus 103

6

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2

answers

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

1

vote

1

answer

53

views

What exactly happening in QAOA in a general way?

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modified 21 hours ago Faiyaz Hasan 107

2

votes

1

answer

37

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

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modified yesterday Martin Vesely 7,753

1

vote

0

answers

26

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

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modified yesterday Martin Vesely 7,753

2

votes

1

answer

110

views

What is a good video resource for quantum computing?

resource-request

modified 2 days ago glS 12.2k

2

votes

1

answer

36

views

What is the difference between SWAP & Bridge gates?

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modified 2 days ago glS 12.2k

0

votes

2

answers

40

views

Phase Kickback - factoring Dirac representation

qiskit textbook-and-exercises

answered 2 days ago KAJ226 6,257

4

votes

1

answer

39

views

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

3

votes

1

answer

54

views

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

votes

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

3

votes

1

answer

36

views

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

algorithm hhl-algorithm phase-estimation

modified yesterday Adrien Suau 3,670

1

vote

1

answer

23

views

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

vote

2

answers

36

views

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

99

views

Does sending a qubit using a quantum network through some conventional physical medium mean it is not with sender anymore after sending?

superdense-coding

modified Feb 22 at 23:27 Mariia Mykhailova 6,606

4

votes

1

answer

28

views

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

votes

1

answer

36

views

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

1

vote

1

answer

25

views

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

1

vote

2

answers

35

views

Multiple Providers on IBMQ

programming qiskit ibm-q-experience ibm

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

2

votes

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

votes

0

answers

32

views

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

circuit-construction ibm-q-experience

modified 2 days ago heromano 187

2

votes

1

answer

32

views

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

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

answered Feb 23 at 2:30 Adam Zalcman 4,197

2

votes

2

answers

78

views

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

programming qiskit hamiltonian-simulation

modified yesterday viwosh 1

2

votes

1

answer

69

views

How to implement the swap test with the help of qiskit?

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answered Feb 22 at 6:58 KAJ226 6,257

2

votes

1

answer

31

views

How do I represent my 3-qubit state in the computational basis?

quantum-state mathematics textbook-and-exercises tensor-product linear-algebra

modified Feb 22 at 22:48 glS 12.2k

0

votes

1

answer

46

views

What does “large-scale universal quantum computation” mean?

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modified Feb 22 at 22:48 glS 12.2k

0

votes

0

answers

43

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Quantum correlation and Bell's inequality [closed]

entanglement non-locality correlations nonclassicality

modified Feb 23 at 9:13 glS 12.2k

2

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1

answer

155

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+50

Condition that a tripartite/multipartite qubit state does/does not admit a Schmidt decomposition?

quantum-state entanglement mathematics

answered Feb 23 at 8:21 Adam Zalcman 4,197

2

votes

1

answer

35

views

How does MCPhaseGate/MCU1Gate works internally in qiskit?

programming quantum-gate qiskit gate-synthesis

modified 2 days ago luciano 1,465

1

vote

1

answer

55

views

What is a good program to practice using a quantum algorithm? Should I use Cirq or Qiskit?

qiskit algorithm resource-request cirq

modified Feb 22 at 12:24 glS 12.2k

2

votes

2

answers

42

views

How to implement $\sqrt{iSWAP}$ in Qiskit

qiskit gate-synthesis

answered Feb 22 at 8:01 luciano 1,465

0

votes

0

answers

50

views

Reduced Density Matrix as Tensor

entanglement tensor-networks

modified Feb 23 at 5:37 siddhi mali 53

0

votes

0

answers

36

views

What is the best book or resource to start Learning about Quantum Computing? [duplicate]

entanglement resource-request

modified Feb 22 at 12:20 glS 12.2k

0

votes

1

answer

45

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Quantum supremacy: shallow depth Haar random circuits and unitary designs

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answered Feb 22 at 9:17 Markus Heinrich 928

2

votes

2

answers

96

views

Qiskit: Taking a QUBO matrix into `qubit_op'

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answered Feb 23 at 16:06 bubba 31

-2

votes

1

answer

34

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IBMQ.load_account() fails with “403 Client Error” [closed]

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modified Feb 22 at 12:15 luciano 1,465

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