User John Parker

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What is the "no fast-forwarding theorem"?

algorithm

Jul 13 at 11:00 glS♦ 15.9k

1

5

votes

1

answer

57

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Why does Hamiltonian simulation seek to find the energy minimum, if eigenvalues of unitaries are always unimodular?

Nov 2 at 11:15 glS♦ 15.9k

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5

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0

answers

78

views

Oblivious Amplitude Amplification & Eigenstate decomposition

algorithm

Sep 28 at 14:12 John Parker 705

4

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1

answer

153

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Variational Quantum Linear Solver (Hadamard test): circuit question

algorithm vqe linear-algebra

Jun 26 at 15:27 glS♦ 15.9k

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4

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2

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169

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What is the difference between amplitude amplification, amplitude estimation, and phase estimation?

algorithm phase-estimation amplitude-amplification

Jun 6 at 9:14 glS♦ 15.9k

4

votes

1

answer

452

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What's the role of mixer in QAOA?

algorithm optimization qaoa

May 20 at 0:54 Gianni Mossi 328

3

votes

1

answer

97

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Why are all the eigenvalues of a "Hermitian block-encoding" equal to $\pm1$?

algorithm unitarity eigenvalue

Sep 23 at 7:25 glS♦ 15.9k

3

votes

2

answers

41

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Normalization question in VQLS

qiskit algorithm textbook-and-exercises linear-algebra

Aug 25 at 18:15 forky40 3,536

3

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1

answer

159

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How does the performance of QAOA and VQE compare to Grover's?

grovers-algorithm vqe qaoa

Jun 19 at 6:20 epelaaez 2,506

3

votes

1

answer

137

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What is the relation between Hadamard transformation and QFT?

algorithm quantum-fourier-transform hadamard

Jun 5 at 14:53 glS♦ 15.9k

3

votes

1

answer

140

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What are spin-coherent states?

quantum-state quantum-optics angular-momentum

May 18 at 7:53 glS♦ 15.9k

2

votes

1

answer

54

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In block encoding, how to determine the dimension of the elements from $\alpha(⟨0|^{\otimes a}\otimes I)U(|0〉^{\otimes a}\otimes|\psi〉)=A|\psi〉$?

algorithm

Sep 16 at 12:03 Tristan Nemoz 1,760

2

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1

answer

157

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Initial state preparation for Hadamard test

quantum-circuit hadamard

Jul 27 at 11:06 Martin Vesely 10.2k

2

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1

answer

64

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Manipulating the amplitude of state based on the state information

algorithm unitarity amplitude-amplification

Jul 15 at 5:03 CommunityBot 1

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2

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89

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How does a Hadamard discrete-time quantum walk result in a skewed distribution?

hadamard quantum-walks

Jun 19 at 17:11 glS♦ 15.9k

2

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3

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214

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Why does the trace of density operators need to be one?

quantum-state textbook-and-exercises density-matrix trace

Apr 7 at 2:12 kludg 2,924

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References about deriving the complexity of a given algorithm

algorithm resource-request complexity-theory

Sep 22 at 9:41 glS♦ 15.9k

1

vote

1

answer

79

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Wick rotation of the Schrödinger equation

algorithm mathematics hamiltonian-simulation

Sep 11 at 12:24 glS♦ 15.9k

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0

answers

31

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What's the importance of a relationship with Gibbs state in the context of VarQITE or variational algorithms?

algorithm vqe

Aug 8 at 21:37 glS♦ 15.9k

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votes

0

answers

23

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Matrix derivation from prepare+ /select/prepare operator

algorithm

Sep 23 at 18:27 John Parker 705

0

votes

1

answer

38

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Trace calculation from the basis to |+> and |-> states

algorithm trace

Aug 18 at 14:50 DaftWullie 42.3k

0

votes

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37

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Quantum Boltzmann Machine and Gibbs state

algorithm machine-learning quantum-enhanced-machine-learning

Jul 21 at 11:26 glS♦ 15.9k

0

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1

answer

30

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In the context of block-encoding, what does $|0\rangle\otimes I$ represent?

mathematics linear-algebra

Jun 30 at 8:20 glS♦ 15.9k

0

votes

1

answer

77

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In the amplitude amplification algorithm in Nielsen and Chuang's book, why is the error probability $M/N$?

textbook-and-exercises grovers-algorithm nielsen-and-chuang amplitude-amplification

Jun 6 at 0:07 narip 1,872

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24 Questions

What is the "no fast-forwarding theorem"?

Why does Hamiltonian simulation seek to find the energy minimum, if eigenvalues of unitaries are always unimodular?

Oblivious Amplitude Amplification & Eigenstate decomposition

Variational Quantum Linear Solver (Hadamard test): circuit question

What is the difference between amplitude amplification, amplitude estimation, and phase estimation?

What's the role of mixer in QAOA?

Why are all the eigenvalues of a "Hermitian block-encoding" equal to $\pm1$?

Normalization question in VQLS

How does the performance of QAOA and VQE compare to Grover's?

What is the relation between Hadamard transformation and QFT?

What are spin-coherent states?

In block encoding, how to determine the dimension of the elements from $\alpha(⟨0|^{\otimes a}\otimes I)U(|0〉^{\otimes a}\otimes|\psi〉)=A|\psi〉$?

Initial state preparation for Hadamard test

Manipulating the amplitude of state based on the state information

How does a Hadamard discrete-time quantum walk result in a skewed distribution?

Why does the trace of density operators need to be one?

References about deriving the complexity of a given algorithm

Wick rotation of the Schrödinger equation

What's the importance of a relationship with Gibbs state in the context of VarQITE or variational algorithms?

Matrix derivation from prepare+ /select/prepare operator

Trace calculation from the basis to |+> and |-> states

Quantum Boltzmann Machine and Gibbs state

In the context of block-encoding, what does $|0\rangle\otimes I$ represent?

In the amplitude amplification algorithm in Nielsen and Chuang's book, why is the error probability $M/N$?