Quantum Computing Stack Exchange

2

votes

2

answers

60

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In shadow tomography, how is the state reconstructed from its shadows?

modified 14 mins ago David Bar Moshe 1,714

0

votes

0

answers

4

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Maximum number of qubits suppoted by the Qasm simulator

resource-request

asked 23 mins ago L. Lenzini 1

0

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0

answers

5

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Numerical optimization of QRAC

programming algorithm bloch-sphere qrac

asked 1 hour ago Vaisakh M 21

0

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0

answers

18

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Changing the sign of relative phase

quantum-gate quantum-state

modified 4 hours ago Veerano 1

2

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1

answer

48

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IBMQ: Can I implement a quantum measurement in the middle of a quantum circuit?

ibm-q-experience

modified 6 hours ago KAJ226 2,773

0

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1

answer

30

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A CNOT between two Hadamard gates: why does the CNOT changed the output of the second Hadamard gate?

quantum-gate hadamard quantum-circuit

modified 11 hours ago KAJ226 2,773

3

votes

1

answer

69

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Is there an efficient way to realize a Toffoli with control qubits fixed at $|+\rangle$?

quantum-gate circuit-construction

modified 17 hours ago Daniele Cuomo 93

1

vote

1

answer

23

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How to measure a quantum circuit's execution time on a real IBM device?

qiskit ibm-q-experience ibm

answered 19 hours ago jyu00 371

0

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0

answers

21

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What does it mean “the N uses of classical-quantum channel”?

quantum-state algorithm error-correction povm

modified 20 hours ago met927 2,588

5

votes

3

answers

362

views

In Bell nonlocality, why does $P(ab|xy)\neq P(a|x)P(b|y)$ mean the variables are not statistically independent?

mathematics information-theory correlations

modified 21 hours ago glS 11.4k

0

votes

0

answers

15

views

RAC for XOR functions

algorithm mathematics quantum-information probability qrac

asked yesterday Vaisakh M 21

1

vote

1

answer

36

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How to implement gate error mitigation in Qiskit?

quantum-gate qiskit error-mitigation

answered yesterday KAJ226 2,773

2

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1

answer

32

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STO-3G Basis Set

classical-computing superconducting-quantum-computing

modified yesterday KAJ226 2,773

4

votes

0

answers

63

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In Nielsen and Chuang, how can $\frac{1}{2(e-1)}$ result from $\frac12\int_{e-1}^{2^{t-1}-1}dl\frac{1}{l^2}$?

mathematics textbook-and-exercises nielsen-and-chuang phase-estimation

modified yesterday Jonathan Trousdale 2,528

7

votes

1

answer

237

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Consequences of $MIP^\ast=RE$ Regarding Quantum Algorithms

circuit-construction complexity-theory

modified yesterday Jonathan Trousdale 2,528

0

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2

answers

44

views

Creating a parameterized Operator in Qiskit

quantum-gate programming qiskit vqe unitarity

answered yesterday tsgeorgios 936

3

votes

2

answers

106

views

Does 1 qubit correspond to 2 bits?

classical-computing superdense-coding

answered yesterday keisuke.akira 1,333

1

vote

2

answers

104

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Question about a circuit from “Quantum Computing for Computer Scientists”

quantum-gate programming grovers-algorithm quantum-circuit

modified yesterday LPenguin 113

2

votes

1

answer

50

views

How to generate all stabilizer states numerically?

stabilizer-state

modified yesterday Markus Heinrich 593

0

votes

1

answer

18

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IBMQ: “Credentials are already in use”

programming qiskit ibm-q-experience

modified yesterday glS 11.4k

1

vote

0

answers

35

views

Getting Choi-matrix of a subsystem

programming qiskit quantum-operation

modified yesterday glS 11.4k

2

votes

2

answers

26

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Creating a resource count unit test in Q#

programming q#

modified yesterday glS 11.4k

0

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0

answers

14

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Correctly configuring a Q# test project in Visual Studio Code

programming q#

modified yesterday glS 11.4k

0

votes

1

answer

50

views

Quantum Circuit to inverse the probability distribution

programming qiskit algorithm circuit-construction probability

modified yesterday glS 11.4k

3

votes

1

answer

60

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How are the eigenvalues of $\rho=\frac12(|a\rangle\!\langle a| +|b\rangle\!\langle b|)$ derived?

quantum-state density-matrix textbook-and-exercises linear-algebra eigenvalue

modified yesterday glS 11.4k

3

votes

0

answers

34

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IBMQ backends: How can I know the repetition rate and depth limits of real devices?

qiskit programming ibm

modified yesterday glS 11.4k

2

votes

1

answer

42

views

In Uhlmann's theorem, should the polar decomposition be written as $A=|A|V$ or $A=V|A|$?

textbook-and-exercises nielsen-and-chuang fidelity

modified yesterday glS 11.4k

4

votes

0

answers

41

views

How do we realise photonic gates?

quantum-gate physical-realization photonics optical-quantum-computing

modified yesterday glS 11.4k

1

vote

1

answer

47

views

Inequality in overlap of quantum states

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

modified yesterday glS 11.4k

2

votes

1

answer

62

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Discrepancy in inner product between tensor products

mathematics textbook-and-exercises tensor-product inner-product

modified yesterday glS 11.4k

2

votes

1

answer

56

views

Can I teleport a string of 0s and 1s?

qiskit programming circuit-construction teleportation

modified yesterday glS 11.4k

16

votes

4

answers

2k

views

Is Quantum Biocomputing ahead of us?

architecture solid-state biocomputing

modified 2 days ago Systematic 21

3

votes

0

answers

82

views

Which codes can implement transversal non-Clifford gates

quantum-gate error-correction stabilizer-code surface-code

modified 2 days ago Martin Vesely 6,630

5

votes

1

answer

129

views

Closeness of purifications of states

information-theory fidelity trace-distance linear-algebra

answered 2 days ago John Watrous 3,213

1

vote

1

answer

247

views

Error while running the circuit on a real device on IBMQ

ibm

modified 2 days ago M. Stern 1,814

1

vote

1

answer

60

views

Pauli Matrix tolerant and encoding

quantum-gate entanglement error-correction textbook-and-exercises nielsen-and-chuang

modified Nov 29 at 1:11 QC-learner 49

2

votes

0

answers

33

views

In QAOA why do we need $m \log(m)$ repititions to get at least $F_{p}(\beta , \gamma) - 1$ with probability of $1 - 1/m$?

qaoa probability

modified Nov 29 at 0:55 tap86 25

2

votes

0

answers

54

views

How to write the classical algorithm for lights out problem?

algorithm grovers-algorithm

modified Nov 28 at 21:39 user9318 306

3

votes

1

answer

101

views

Question Regarding Quantum Period-Finding Fourier Transform Approximation

quantum-gate algorithm nielsen-and-chuang shors-algorithm quantum-fourier-transform

answered Nov 28 at 17:39 Anatoly 11

1

vote

1

answer

60

views

CSS Code and Fault-tolerant Problem in Nielsen and Isaac Chuang‘s book

quantum-gate error-correction textbook-and-exercises nielsen-and-chuang fault-tolerance

modified Nov 28 at 13:30 QC-learner 49

1

vote

1

answer

31

views

Resources on randomized algorithms for analysis and design of quantum algorithms

resource-request randomised-benchmarking

modified Nov 28 at 12:26 glS 11.4k

1

vote

2

answers

41

views

Check if $|\psi\rangle$ is equal to a fixed basis state using the standard set of gates

algorithm circuit-construction

modified Nov 28 at 7:20 Danylo Y 3,796

0

votes

1

answer

16

views

Why do I get the error name operator is not defined?

programming

answered Nov 28 at 1:18 KAJ226 2,773

4

votes

0

answers

35

views

Is there a good reason to use T-count minimization for circuits executed on current IBM open quantum systems (real hardware)?

error-correction architecture ibm clifford-group

modified Nov 27 at 23:04 luciano 795

2

votes

1

answer

109

views

Optimal sampling strategy for VQE

algorithm optimization

modified Nov 27 at 23:02 Community♦ 1

6

votes

3

answers

354

views

What is the location of the Qiskit config file?

qiskit programming

answered Nov 27 at 22:14 acingmath 11

2

votes

2

answers

53

views

Is there a quantum processor with physically implemented Toffoli gate?

physical-realization ibm google-sycamore qutrit

modified Nov 27 at 20:04 luciano 795

1

vote

1

answer

50

views

How does feedback work in simple Grovers algorithm where $n=4$?

algorithm circuit-construction grovers-algorithm textbook-and-exercises

modified Nov 27 at 19:10 glS 11.4k

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