User John Parker

7 votes

1 answer

1k views

What's the role of mixer in QAOA?

asked May 18, 2021 at 22:33

6 votes

1 answer

422 views

What is the "no fast-forwarding theorem"?

asked Jul 13, 2021 at 1:17

5 votes

2 answers

309 views

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

asked Jun 4, 2021 at 1:42

5 votes

1 answer

297 views

Oblivious Amplitude Amplification & Eigenstate decomposition

asked Sep 28, 2021 at 14:12

5 votes

1 answer

122 views

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

asked Oct 27, 2021 at 13:41

4 votes

1 answer

171 views

What is a simple example showing the issues of not doing the "uncomputation" step?

asked Jan 29 at 20:11

4 votes

0 answers

86 views

Implementing "computable phase shifts" using T Toffoli ( problem 4.1 from Nielsen and Chuang's)

asked Feb 1 at 21:38

4 votes

1 answer

652 views

What are spin-coherent states?

asked May 17, 2021 at 21:08

4 votes

1 answer

204 views

Variational Quantum Linear Solver (Hadamard test): circuit question

asked Jun 24, 2021 at 15:29

3 votes

2 answers

65 views

Normalization question in VQLS

asked Aug 25, 2021 at 11:22

3 votes

1 answer

551 views

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

asked Jun 7, 2021 at 23:22

3 votes

1 answer

263 views

What is the relation between Hadamard transformation and QFT?

asked Jun 4, 2021 at 14:04

3 votes

1 answer

135 views

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

asked Sep 22, 2021 at 19:51

2 votes

0 answers

29 views

contraction related Bit flip channel

asked May 19 at 2:01

2 votes

1 answer

75 views

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

asked Sep 14, 2021 at 20:01

2 votes

1 answer

73 views

Manipulating the amplitude of state based on the state information

asked Jun 14, 2021 at 17:37

2 votes

2 answers

143 views

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

asked Jun 18, 2021 at 17:42

2 votes

3 answers

778 views

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

asked Apr 6, 2021 at 17:37

2 votes

1 answer

218 views

Initial state preparation for Hadamard test

asked Jul 26, 2021 at 14:34

2 votes

0 answers

46 views

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

asked Aug 8, 2021 at 12:12

1 vote

1 answer

193 views

Wick rotation of the Schrödinger equation

asked Sep 10, 2021 at 17:56

1 vote

1 answer

50 views

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

asked Jun 30, 2021 at 2:26

1 vote

0 answers

46 views

Quantum Boltzmann Machine and Gibbs state

asked Jul 19, 2021 at 11:18

1 vote

1 answer

53 views

References about deriving the complexity of a given algorithm

asked Sep 17, 2021 at 18:02

0 votes

0 answers

40 views

Partial trace formulation

asked Jan 23 at 20:54

0 votes

1 answer

54 views

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

asked Aug 18, 2021 at 14:37

0 votes

1 answer

98 views

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

asked Jun 4, 2021 at 19:32

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27 Questions

What's the role of mixer in QAOA?

What is the "no fast-forwarding theorem"?

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

Oblivious Amplitude Amplification & Eigenstate decomposition

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

What is a simple example showing the issues of not doing the "uncomputation" step?

Implementing "computable phase shifts" using T Toffoli ( problem 4.1 from Nielsen and Chuang's)

What are spin-coherent states?

Variational Quantum Linear Solver (Hadamard test): circuit question

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?

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

contraction related Bit flip channel

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

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?

Initial state preparation for Hadamard test

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

Wick rotation of the Schrödinger equation

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

Quantum Boltzmann Machine and Gibbs state

References about deriving the complexity of a given algorithm

Partial trace formulation

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

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