Quantum Computing Stack Exchange

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How to selectively apply noise in Qiskit simulations?

asked 32 mins ago James Wootton 7,786

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0

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7

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Why does Google's quantum processor outperform IBM's?

quantum-advantage ibm google-sycamore

modified 41 mins ago user1936752 274

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2

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26

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Exponential of Hadamard matrix

hadamard

modified 50 mins ago ChainedSymmetry 623

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0

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9

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Why do the IBM and Google processors both have 53 qubits?

physical-qubit

asked 1 hour ago Randomblue 101

4

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2

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230

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Quantum Supremacy: Some questions on cross-entropy benchmarking

experiment entropy quantum-advantage google-sycamore

modified 2 hours ago Björn Smedman 24

4

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1

answer

43

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Is quantum complexity basis-invariant?

complexity-theory non-locality

modified 12 hours ago Martin Ziegler 21

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1

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5

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cirq.Ry complains that it needs one argument

cirq

modified 15 hours ago Craig Gidney 5,873

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0

answers

12

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Why must we take multiple measurements for different values of $M$?

algorithm phase-estimation

asked 16 hours ago Jack Ceroni 358

4

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1

answer

79

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Proving $\langle j_2|\langle j_1| U(|0\rangle\!\langle0|\otimes\rho)U^\dagger|j_2\rangle|j_1\rangle =\operatorname{Tr}(M_j\rho)$

mathematics density-matrix

modified 17 hours ago Mithrandir24601♦ 2,807

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0

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34

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Can we hope in the near future to have web apps running quantum algorithms in real-time?

applications

modified yesterday glS 6,237

5

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1

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89

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What does W stand for in the W entangled state?

quantum-state entanglement resource-request history

modified yesterday glS 6,237

4

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1

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39

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How to measure entanglement in an algorithm?

algorithm quantum-information entanglement shors-algorithm entropy

answered yesterday DaftWullie 21.5k

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1

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55

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How does ControlledOnInt in Q# make it Grovers Oracle?

grovers-algorithm q#

modified yesterday Mariia Mykhailova 3,778

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2

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73

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How to decompose a unitary transform into two-level unitary matrices?

algorithm quantum-gate

answered yesterday glS 6,237

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0

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38

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Cirq: Any interesting introductory level example using 2D grid of qubits?

cirq

asked 2 days ago Abuzer Yakaryilmaz 124

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0

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45

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Open problems in quantum algorithms

algorithm resource-request

modified 2 days ago Sanchayan Dutta 8,456

4

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61

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Shor's Code: Understanding how it satisfies Knill Laflamme Theorem

quantum-information error-correction

modified 2 days ago glS 6,237

4

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1

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56

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Matrix Index and multiplication rules for Hermitian Pauli group products

mathematics error-correction pauli-gates

answered 2 days ago DaftWullie 21.5k

4

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1

answer

55

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How to check if a two-qubit gate is entangling?

quantum-gate entanglement mathematics

answered 2 days ago Sanchayan Dutta 8,456

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1

answer

95

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Transforming the first Bell state into the other Bell states

quantum-gate quantum-state bell-basis

modified 2 days ago Sanchayan Dutta 8,456

4

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1

answer

57

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Developing quantum circuits for specific quantum chemistry configurations

circuit-construction chemistry

modified 2 days ago Sanchayan Dutta 8,456

2

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0

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24

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Understanding shared Bell states from quantum entanglement

quantum-gate quantum-state entanglement teleportation

modified 2 days ago Sanchayan Dutta 8,456

5

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2

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85

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How and why does swap test works?

algorithm quantum-gate quantum-state

modified 2 days ago Sanchayan Dutta 8,456

2

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2

answers

73

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How to prepare a specific initial state of three qubits?

programming qiskit cirq

modified 2 days ago Sanchayan Dutta 8,456

4

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1

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53

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What design considerations set the frequency bounds for superconducting qubits?

architecture physical-qubit superconducting-quantum-computing

modified Oct 19 at 21:01 Community♦ 1

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1

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94

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Quantum computer vs. supercomputer performance [on hold]

classical-computing performance

modified Oct 19 at 20:51 Bob Walance 17

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2

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50

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Why does a controlled gate not constitute a measurement?

quantum-gate measurement

modified Oct 19 at 19:43 ChainedSymmetry 623

14

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4

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404

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What use has quantum computing been?

technologies applications nisq

modified Oct 19 at 12:50 Mark S 1,479

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1

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29

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Stabilizer state QFI lower limit query

quantum-information pauli-gates stabilizer-state

answered Oct 18 at 12:47 DaftWullie 21.5k

2

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1

answer

29

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Quantum Fisher information for pure states query

quantum-information mathematics density-matrix

modified Oct 17 at 3:35 Sanchayan Dutta 8,456

4

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0

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23

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Do we know anything about the computational complexity of the exchange-correlation functional?

chemistry solid-state many-body-systems

asked Oct 17 at 3:30 user157879 173

25

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2

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935

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Has there been any truly ground breaking advance in quantum algorithms since Grover and Shor?

speedup grovers-algorithm shors-algorithm

modified Oct 16 at 15:25 Sanchayan Dutta 8,456

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58

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Resources in Spanish to start learning quantum computing and quantum programming (Qiskit)

programming qiskit resource-request

modified Oct 16 at 15:22 Sanchayan Dutta 8,456

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2

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40

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Prove that the partial trace is equivalent to measuring and discarding

measurement density-matrix partial-trace

answered Oct 16 at 14:28 glS 6,237

3

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2

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57

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Probability of equal outcomes measuring a Bell state in the directions $\vec{n}_1,\vec{n}_2$

entanglement measurement bloch-sphere

modified Oct 16 at 14:12 glS 6,237

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34

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Implementing noise model in Qiskit using arbitrary basis gates

qiskit noise

answered Oct 16 at 14:06 met927 511

4

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1

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52

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How to split a 2-local unitary operator through singular value decomposition?

mathematics tensor-networks

modified Oct 16 at 12:19 Dyon J Don Kiwi van Vreumingen 399

3

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1

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43

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What's the difference between observing in a given direction and operating in that same direction?

quantum-gate measurement physical-qubit quantum-operation

answered Oct 16 at 11:00 glS 6,237

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3

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67

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Ideas for school-level project on quantum computing

algorithm research

answered Oct 16 at 6:35 Bob Walance 17

14

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3

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998

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What applications does Grover's Search Algorithm have?

algorithm grovers-algorithm

answered Oct 16 at 0:58 tparker 559

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0

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23

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Explicit Construction of Classical Rules in Quantum Turing Machine

quantum-turing-machine computability-theory

modified Oct 15 at 18:02 Sanchayan Dutta 8,456

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1

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107

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Exploring quantum computing with Qiskit [closed]

qiskit

modified Oct 15 at 13:20 Sanchayan Dutta 8,456

-1

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0

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52

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Who can give me a report about a simple calculate to show Quantum Computing's advantageous [duplicate]

resource-request

modified Oct 15 at 8:24 Mithrandir24601♦ 2,807

41

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6

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1k

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Programming quantum computers for non-physics majors

resource-request programming

modified Oct 15 at 4:33 Sanchayan Dutta 8,456

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2

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57

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

mathematics bloch-sphere

modified Oct 15 at 0:17 Timothy Chase 31

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2

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89

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Input and output qubit notation in quantum gates

quantum-gate quantum-state notation

modified Oct 14 at 21:18 ChainedSymmetry 623

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1

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47

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Exercise 10.34 of Nielsen and Chuang : $-I$ not element of stabilizer group iff $g_j^2=I$ and $g_j \neq I$ where $g_j$ generators

error-correction nielsen-and-chuang stabilizer-code

modified Oct 14 at 16:19 Sanchayan Dutta 8,456

2

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2

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93

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Angular Error associated with Quantum Search Algorithm

algorithm mathematics grovers-algorithm nielsen-and-chuang

modified Oct 14 at 16:14 Sanchayan Dutta 8,456

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