John Parker's user avatar
John Parker's user avatar
John Parker's user avatar
John Parker
  • Member for 1 year, 6 months
  • Last seen more than a month ago
7 votes
1 answer
1k views

What's the role of mixer in QAOA?

6 votes
1 answer
422 views

What is the "no fast-forwarding theorem"?

5 votes
2 answers
309 views

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

5 votes
1 answer
297 views

Oblivious Amplitude Amplification & Eigenstate decomposition

5 votes
1 answer
122 views

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

4 votes
1 answer
171 views

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

4 votes
0 answers
86 views

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

4 votes
1 answer
652 views

What are spin-coherent states?

4 votes
1 answer
204 views

Variational Quantum Linear Solver (Hadamard test): circuit question

3 votes
2 answers
65 views

Normalization question in VQLS

3 votes
1 answer
551 views

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

3 votes
1 answer
263 views

What is the relation between Hadamard transformation and QFT?

3 votes
1 answer
135 views

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

2 votes
0 answers
29 views

contraction related Bit flip channel

2 votes
1 answer
75 views

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

2 votes
1 answer
73 views

Manipulating the amplitude of state based on the state information

2 votes
2 answers
143 views

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

2 votes
3 answers
778 views

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

2 votes
1 answer
218 views

Initial state preparation for Hadamard test

2 votes
0 answers
46 views

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

1 vote
1 answer
193 views

Wick rotation of the Schrödinger equation

1 vote
1 answer
50 views

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

1 vote
0 answers
46 views

Quantum Boltzmann Machine and Gibbs state

1 vote
1 answer
53 views

References about deriving the complexity of a given algorithm

0 votes
0 answers
40 views

Partial trace formulation

0 votes
1 answer
54 views

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

0 votes
1 answer
98 views

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