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John Parker
  • Member for 1 year, 1 month
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6 votes
1 answer
857 views

What's the role of mixer in QAOA?

6 votes
1 answer
314 views

What is the "no fast-forwarding theorem"?

5 votes
2 answers
244 views

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

5 votes
1 answer
216 views

Oblivious Amplitude Amplification & Eigenstate decomposition

5 votes
1 answer
91 views

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

4 votes
1 answer
146 views

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

4 votes
0 answers
62 views

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

4 votes
1 answer
396 views

What are spin-coherent states?

4 votes
1 answer
177 views

Variational Quantum Linear Solver (Hadamard test): circuit question

3 votes
2 answers
49 views

Normalization question in VQLS

3 votes
1 answer
395 views

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

3 votes
1 answer
199 views

What is the relation between Hadamard transformation and QFT?

3 votes
1 answer
118 views

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

2 votes
1 answer
68 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
0 answers
19 views

contraction related Bit flip channel

2 votes
1 answer
68 views

Manipulating the amplitude of state based on the state information

2 votes
2 answers
121 views

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

2 votes
3 answers
498 views

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

2 votes
1 answer
200 views

Initial state preparation for Hadamard test

2 votes
0 answers
38 views

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

1 vote
1 answer
147 views

Wick rotation of the Schrödinger equation

1 vote
0 answers
42 views

Quantum Boltzmann Machine and Gibbs state

1 vote
1 answer
48 views

References about deriving the complexity of a given algorithm

0 votes
0 answers
24 views

Matrix derivation from prepare+ /select/prepare operator

0 votes
0 answers
36 views

Partial trace formulation

0 votes
1 answer
35 views

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

0 votes
1 answer
45 views

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

0 votes
1 answer
89 views

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