Hottest Questions Today

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Question on using the Collect2qBlocks() and ConsolidateBlocks() optimizations

programming qiskit

answered 2 hours ago Kesha H. 6

2

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1

answer

34

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Can I find the states of individual qubits in a quantum register using only linear algebra?

mathematics matrix-representation

answered yesterday Craig Gidney 5,658

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2

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50

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Prove by induction $H^{\otimes n} \left| 0 \right>^{\otimes n} = \frac{1}{\sqrt{2^n}} \sum_{i=0}^{2^n -1} \left| i \right>$

hadamard

answered yesterday glS 5,749

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1

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35

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Can a mixed state be represented on a Bloch sphere?

quantum-state bloch-sphere

modified yesterday glS 5,749

2

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1

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151

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+50

Does the Copenhagen interpretation (+ “quasi-classical measuring apparatus”) allow one to bypass a derivation's objection?

measurement

modified yesterday glS 5,749

-3

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0

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32

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Shor's algorithim related Quantum Computing [on hold]

algorithm programming quantum-information

asked Sep 15 at 5:34 Aasim2000 1

2

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1

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40

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Is their a way to perfectly clone coherent state and squeezed states?

cloning

answered Sep 13 at 16:38 Josh Izaac 171

2

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1

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46

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Big Endian vs Little Endian in Qiskit

qiskit

answered Sep 15 at 1:45 Jack Woehr 31

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1

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40

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Can someone show the linear algebra calculations for X, H, and CNOT gates?

quantum-information

answered Sep 13 at 6:03 Ashish 124

7

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1

answer

36

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Ground state energy estimation - VQE vs. Ising vs. Trotter–Suzuki

algorithm q# hamiltonian-simulation

answered Sep 13 at 0:05 Chris Granade 386

1

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3

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72

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Cirq, qiskit, q#, ibmq(circuit board), other

qiskit q# cirq

answered Sep 12 at 4:39 Dr. Sarah Kaiser 587

3

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1

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72

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+50

Why does entanglement not increase the classical capacity of a channel?

entanglement quantum-channel communication

modified Sep 13 at 22:21 user1936752 272

1

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1

answer

23

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How to prove that antipodal points on the Bloch sphere are orthogonal?

bloch-sphere

answered Sep 13 at 4:20 Danylo Y 1,750

3

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1

answer

48

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Extensions of product states

quantum-state

answered Sep 13 at 7:14 DaftWullie 20.5k

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29

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How to decode 2-bit message from 2 entangled qubits

quantum-state entanglement measurement

modified Sep 12 at 21:01 Mariia Mykhailova 3,603

2

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62

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Eavesdropping in superdense coding: why can't the third party infer anything about the message?

communication superdense-coding

answered Sep 11 at 14:23 glS 5,749

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1

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27

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General Master Equation with Decoherence Query

quantum-information decoherence research correlations

answered Sep 12 at 9:51 Mithrandir24601♦ 2,753

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1

answer

37

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Why use inner and outer product?

quantum-gate quantum-state

answered Sep 12 at 6:48 DaftWullie 20.5k

2

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1

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40

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Help in understanding an exercise on observable / measurement

quantum-state measurement observables

modified Sep 11 at 14:25 glS 5,749

0

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3

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46

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How to add scalar to quantum string

quantum-operation q#

modified Sep 11 at 8:48 glS 5,749

4

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2

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48

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How to factor the output of a CNOT acting on the input $|-,+\rangle$

quantum-gate tensor-product deutsch-jozsa-algorithm

answered Sep 9 at 15:54 glS 5,749

2

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3

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24

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AttributeError: 'AerJob' object has no attribute 'get_counts'

qiskit

answered Sep 11 at 0:16 Paul Nation 356

0

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1

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45

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Should a Pauli $X$ matrix equal the identity matrix to be unitary?

quantum-information pauli-gates unitarity

modified Sep 9 at 22:03 glS 5,749

2

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1

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40

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How do these alternative Q# algorithms produce the same set of Bell states?

quantum-gate programming q#

modified Sep 12 at 3:16 Oke Uwechue 13

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0

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16

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Paper concerning distributing quantum computation on many small quantum computers

resource-request

asked Sep 11 at 21:56 John 116

2

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2

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110

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Are all operations simply matrix multiplication?

quantum-gate quantum-state

modified Sep 9 at 19:04 forky40 320

2

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4

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163

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What is the name for quantum gates that can be reversed?

quantum-gate

modified Sep 5 at 16:36 VP9 40

1

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2

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93

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How to get amplitudes only for chosen qubits?

qiskit circuit-construction

modified Sep 13 at 14:23 Kenenbek Arzymatov 139

-2

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0

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26

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I have a question about a notation! [migrated]

mathematics

modified Sep 10 at 11:16 Nelimee 2,089

2

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0

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15

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Are inseparable states with positive partial transposition nonlocal?

entanglement non-locality nonclassicality

modified Sep 11 at 8:51 glS 5,749

5

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0

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57

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What are the physical reasons behind noise/errors in quantum computers?

physical-realization architecture physical-qubit noise

modified Sep 10 at 8:21 glS 5,749

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2

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107

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Is $\frac{1}{\sqrt{N}}\sum_{j=0}^{N-1}e^{2\pi ixj \left/\phantom\vert\!{N} \right.}|j\rangle |j\rangle$ a valid entangled quantum state?

quantum-state

modified Sep 5 at 14:29 Niel de Beaudrap 7,541

2

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1

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56

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Can we simulate quantum many-body systems with IBMQ Experience?

quantum-gate ibm-q-experience simulation ibm

modified Sep 7 at 13:57 glS 5,749

0

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46

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What is the probability of measuring $|j\rangle$ with $j\in\{0, 1, 2, … N-1\}$?

quantum-state entanglement

modified Sep 11 at 21:44 glS 5,749

5

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2

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81

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What is the point of building arithmetic circuits in a quantum computer?

algorithm programming quantum-advantage

modified Sep 5 at 10:41 glS 5,749

0

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1

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42

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Is measuring real qubit states in a complex basis such as $|0\rangle\pm i|1\rangle$ possible?

measurement

modified Sep 5 at 10:59 glS 5,749

2

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1

answer

69

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Why use U2 and U1 gate in IBM quantum computers?

quantum-gate ibm-q-experience physical-realization

modified Sep 2 at 22:17 Jay Gambetta 301

4

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1

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40

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How are measurements on $Z$ and $X$ axes interpreted in the Bloch sphere?

quantum-gate quantum-state bloch-sphere

modified Sep 2 at 18:02 glS 5,749

1

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2

answers

52

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Measuring a single qubit in 2 bit entangled state

entanglement

answered Sep 3 at 4:20 Ashish 124

1

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2

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82

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Software for Quantum Computing

algorithm programming ibm-q-experience applications nisq

answered 19 hours ago PESchoenberg 9

2

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2

answers

49

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How do I prove that $\sum_{y=0}^{N-1}e^{2\pi i xy/N}=N\delta_{x,0}$?

mathematics quantum-fourier-transform

modified Sep 5 at 9:12 glS 5,749

2

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1

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57

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In the CHSH inequality, how can I know which term is supposed to have the minus sign?

entanglement measurement

modified Sep 2 at 18:15 glS 5,749

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1

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36

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What is the resultant composite quantum state after the transfer?

entanglement teleportation

answered Sep 4 at 13:39 Mark S 1,173

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0

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38

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Resultant state after teleportation?

entanglement measurement teleportation

modified Sep 4 at 18:43 Mark S 1,173

1

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0

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27

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How to understand run_algorithm() inputs in qiskit

algorithm qiskit

asked Sep 5 at 13:59 user8420 76

1

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0

answers

12

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Quantum Simulation Of Tunneling in Small System

simulation universal-gates

asked Sep 7 at 19:17 Hemant Kumar Arjun 21

2

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1

answer

21

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IBMQ.load_account from stored ACCOUNT is failing on Qiskit 0.9.0

qiskit ibm-q-experience

answered Sep 4 at 15:38 met927 341

2

votes

2

answers

35

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Link between distance of a stabilizer code and number of errors it is able to correct

error-correction

answered Sep 3 at 7:54 Patrick Fuentes 74

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