Quantum Computing Stack Exchange

2

votes

1

answer

31

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SWAP test and density matrix distinguishability

modified 4 hours ago Tristan Nemoz 1,408

2

votes

1

answer

6

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Equivalency of the Ising Model and QUBO

vqe optimization qaoa spin-glasses

modified 4 hours ago Martin Vesely 9,863

1

vote

0

answers

33

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What are the getting-started-resources for quantum finance? [closed]

resource-request applications quantum-computing-for-finance

modified 5 hours ago Martin Vesely 9,863

1

vote

1

answer

27

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How to write a code to made envelope function equal to $\pi$ to result in an X gate?

qiskit programming

answered 5 hours ago Martin Vesely 9,863

0

votes

1

answer

40

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how to simulate toric and surface codes with stim + PyMatching

error-correction stabilizer-code surface-code stim toric-code

modified 5 hours ago Craig Gidney 15.8k

0

votes

0

answers

26

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+100

Working with higher energy states in Qiskit Experiments

qiskit programming quantum-state quantum-circuit experiment

modified 6 hours ago QuantumLearner 41

1

vote

0

answers

8

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Qiskit's classifier is not optimising the weights

qiskit optimization quantum-enhanced-machine-learning

modified 6 hours ago Harsha Pamidipalli 11

0

votes

0

answers

5

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Qiskit's draw only shows the circuit's name and not the architecture [migrated]

qiskit

modified 7 hours ago Tristan Nemoz 1,408

1

vote

1

answer

43

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Compute expectation value of an operator in openfermion

openfermion

modified 8 hours ago Solarflare0 309

1

vote

1

answer

86

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What is the convention of indices for the one and two-body integrals in qiskit

qiskit programming chemistry

modified 9 hours ago CommunityBot 1

6

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0

answers

75

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+300

Review paper on depth, qubits and $T$ gates number on Clifford+T decomposition for various "typical" algorithms

algorithm resource-request clifford-group

modified 10 hours ago StarBucK 721

4

votes

0

answers

43

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Can we use quantum phase estimation to count how often we can walk from one Rubik's cube position to another?

hamiltonian-simulation phase-estimation applications

modified 10 hours ago Mark S 5,540

0

votes

1

answer

53

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How to re-execute failed jobs in qiskit?

qiskit programming ibm-q-experience

modified 10 hours ago CommunityBot 1

0

votes

0

answers

10

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Space time volume definition

algorithm

asked 11 hours ago StarBucK 721

1

vote

0

answers

14

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Question on Aharanov and Ta-Shma (ATS)'s Sparse Hamiltonian Simulation notation

hamiltonian-simulation

modified 12 hours ago Mark S 5,540

1

vote

0

answers

7

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What is the role of Josephson junctions and biases in the D-Wave qubit structure?

physical-qubit d-wave superconducting-quantum-computing

asked 14 hours ago Felix 11

0

votes

0

answers

26

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Two body integral calculation taking too long

qiskit programming

modified 15 hours ago glS♦ 15.2k

0

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1

answer

51

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How to create a quantum circuit to implement the same operations but acting on different qubits?

qiskit programming quantum-circuit stabilizer-code

modified yesterday Anna Hua 1

0

votes

2

answers

59

views

How to perform encoding and syndrome measurement in stim

programming error-correction stabilizer-code stim

modified yesterday unknown 566

4

votes

1

answer

116

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How to find a separable decomposition for $|\Psi^+\rangle\!\langle\Psi^+|+|\Phi^+\rangle\!\langle\Phi^+|$?

entanglement density-matrix

modified yesterday glS♦ 15.2k

5

votes

1

answer

143

views

How can one cheat in Mahadev's classical verification protocol if one can find a "claw''?

entanglement complexity-theory unitarity cryptography qma

modified yesterday CommunityBot 1

4

votes

2

answers

226

views

What is a separable decomposition for the Werner state?

entanglement mathematics ppt-criterion werner-states

modified yesterday glS♦ 15.2k

0

votes

1

answer

36

views

How is transformation for measurement in an arbitrary basis derived?

qiskit quantum-gate quantum-state measurement

modified yesterday Adam Zalcman 9,265

3

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1

answer

287

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Why does quantum distinguishability ensure no faster-than-light communication?

quantum-state measurement nielsen-and-chuang faster-than-light

modified yesterday glS♦ 15.2k

2

votes

1

answer

34

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How to write the covariance matrix of a quantum gaussian state as a function of photon numbers?

quantum-state continuous-variable quantum-optics gaussian-states

modified yesterday glS♦ 15.2k

2

votes

1

answer

55

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Computing expectation value of a Pauli string on stabilizer states

programming stabilizer-state stim

modified yesterday glS♦ 15.2k

1

vote

1

answer

81

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Running qiskit on jupyter notebook certverification error: unable to get local user certificate

programming qiskit

modified yesterday CommunityBot 1

2

votes

0

answers

63

views

How to show that Werner states produce correlations explainable via local hidden variable models?

entanglement non-locality ppt-criterion werner-states

modified yesterday glS♦ 15.2k

5

votes

1

answer

65

views

Enforcing a particular layout mapping in Qiskit

qiskit programming optimization

modified yesterday CommunityBot 1

0

votes

1

answer

32

views

Is it possible to collapse a superposition into a preset state such that all entangled qubits collapse to the same state?

entanglement superposition

answered yesterday Craig Gidney 15.8k

8

votes

2

answers

437

views

What's the 'physical consistency' in the partial trace scenario?

measurement textbook-and-exercises density-matrix nielsen-and-chuang partial-trace

modified yesterday Adam Zalcman 9,265

0

votes

0

answers

36

views

In quantum error correction using repetition codes, how would I decode an even # of repetitions with errors on half the qubits using majority voting? [closed]

error-correction

modified 2 days ago epelaaez 2,354

1

vote

1

answer

37

views

In Schumacher’s noiseless channel coding theorem, how do we get the exponents in $|0\rangle ^{\otimes n(1−p)/2}|1\rangle ^{\otimes n(1−p)/2}$?

textbook-and-exercises quantum-operation nielsen-and-chuang information-theory

modified 2 days ago Adam Zalcman 9,265

7

votes

3

answers

134

views

How to learn parameters in a quantum circuit, given an interference pattern?

programming cirq machine-learning tfq

modified 2 days ago Van Peer 355

0

votes

1

answer

59

views

Measurement of single qubit operator $U$ which is both Hermitian and unitary with eigenvalues $±1$

quantum-gate measurement textbook-and-exercises nielsen-and-chuang

modified 2 days ago Condo 922

1

vote

0

answers

15

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$E(U_j,V_j)\leq\Delta/(2m)$ if probabilities of outcomes obtained from the approximate circuit is within a tolerance $Δ>0$

nielsen-and-chuang unitarity universal-gates

asked 2 days ago Sooraj S 113

4

votes

1

answer

73

views

What is the structure of coefficients of $2^N\times 2^N$ unitary matrices decomposed in terms of the Pauli basis?

mathematics unitarity pauli-gates linear-algebra

modified 2 days ago Danylo Y 4,610

0

votes

1

answer

24

views

Knill Laflamme conditon

textbook-and-exercises error-correction optical-quantum-computing

answered 2 days ago Quantum Mechanic 1,509

8

votes

1

answer

2k

views

Evaluating expectation values of operators in Qiskit

qiskit programming

modified 2 days ago Cryoris 1,798

1

vote

0

answers

13

views

How to take 3-point or more correlators into edge probability computation in surface code decoding?

error-correction surface-code

modified 2 days ago narip 1,529

1

vote

0

answers

23

views

Why we need real-time feedback of Surface Code Decoding results?

error-correction surface-code

modified 2 days ago narip 1,529

3

votes

2

answers

586

views

Why is there there an infinite number of possible bases but only a finite number of measurement outcomes

quantum-state

answered 2 days ago glS♦ 15.2k

2

votes

0

answers

43

views

Understanding "Restrictions on Transversal Encoded Quantum Gate Sets"

quantum-gate error-correction

modified Oct 13 at 23:29 Mark S 5,540

1

vote

0

answers

26

views

How can I get fidelity of a gate from randomized benchmarking?

fidelity clifford-group randomised-benchmarking

asked Oct 13 at 21:28 Curious 37

-1

votes

0

answers

21

views

Notation to Replace the Input to a Function [closed]

nielsen-and-chuang notation

asked Oct 13 at 21:24 Alexia. 563

7

votes

3

answers

176

views

Computing $e^x$ on a quantum computer

circuit-construction quantum-operation exponentiation arithmetic

modified Oct 13 at 19:39 jecado 638

1

vote

0

answers

10

views

How does quantum metrology realized in experiment now?

quantum-metrology

asked Oct 13 at 14:44 narip 1,529

1

vote

0

answers

32

views

How to understand picking a random subcube in the Aaronson/Ambainis spatial search algorithm?

amplitude-amplification

modified Oct 13 at 14:20 Mark S 5,540

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