User John Parker

8 votes

1 answer

3k views

What's the role of mixer in QAOA?

asked May 18, 2021 at 22:33

7 votes

2 answers

525 views

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

asked Jun 4, 2021 at 1:42

6 votes

1 answer

750 views

What is the "no fast-forwarding theorem"?

asked Jul 13, 2021 at 1:17

6 votes

1 answer

594 views

Oblivious Amplitude Amplification & Eigenstate decomposition

asked Sep 28, 2021 at 14:12

5 votes

1 answer

262 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

5 votes

1 answer

266 views

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

asked Jan 29, 2022 at 20:11

5 votes

1 answer

290 views

Why does the bit flip channel produce a uniform contraction of $1-2p$?

asked May 19, 2022 at 2:01

5 votes

1 answer

2k views

What are spin-coherent states?

asked May 17, 2021 at 21:08

4 votes

1 answer

887 views

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

asked Jun 7, 2021 at 23:22

4 votes

1 answer

287 views

Variational Quantum Linear Solver (Hadamard test): circuit question

asked Jun 24, 2021 at 15:29

4 votes

1 answer

190 views

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

asked Feb 1, 2022 at 21:38

3 votes

1 answer

115 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

3 votes

1 answer

183 views

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

asked Sep 22, 2021 at 19:51

3 votes

2 answers

142 views

Normalization question in VQLS

asked Aug 25, 2021 at 11:22

3 votes

1 answer

664 views

What is the relation between Hadamard transformation and QFT?

asked Jun 4, 2021 at 14:04

2 votes

1 answer

115 views

Manipulating the amplitude of state based on the state information

asked Jun 14, 2021 at 17:37

2 votes

2 answers

328 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

2k views

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

asked Apr 6, 2021 at 17:37

2 votes

1 answer

288 views

Initial state preparation for Hadamard test

asked Jul 26, 2021 at 14:34

2 votes

0 answers

72 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

2 votes

1 answer

130 views

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

asked Jun 30, 2021 at 2:26

2 votes

1 answer

82 views

What is entanglement barrier?

asked Mar 22 at 15:03

1 vote

1 answer

59 views

References about deriving the complexity of a given algorithm

asked Sep 17, 2021 at 18:02

1 vote

0 answers

73 views

Quantum Boltzmann Machine and Gibbs state

asked Jul 19, 2021 at 11:18

1 vote

1 answer

448 views

Wick rotation of the Schrödinger equation

asked Sep 10, 2021 at 17:56

0 votes

1 answer

126 views

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

asked Aug 18, 2021 at 14:37

0 votes

1 answer

127 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 difference between amplitude amplification, amplitude estimation, and phase estimation?

What is the "no fast-forwarding theorem"?

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?

Why does the bit flip channel produce a uniform contraction of $1-2p$?

What are spin-coherent states?

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

Variational Quantum Linear Solver (Hadamard test): circuit question

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

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

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

Normalization question in VQLS

What is the relation between Hadamard transformation and QFT?

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?

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

What is entanglement barrier?

References about deriving the complexity of a given algorithm

Quantum Boltzmann Machine and Gibbs state

Wick rotation of the Schrödinger equation

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

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