Attila Kun's user avatar
Attila Kun's user avatar
Attila Kun's user avatar
Attila Kun
  • Member for 2 years, 2 months
  • Last seen more than a month ago
35 votes
5 answers
4k views

Introductory material for quantum machine learning

30 votes
5 answers
6k views

How to derive the CNOT matrix for a 3-qubit system where the control & target qubits are not adjacent?

  • 3,918
20 votes
1 answer
937 views

What are examples of Hamiltonian simulation problems that are BQP-complete?

9 votes
2 answers
761 views

What is the advantage of quantum machine learning over traditional machine learning?

  • 345
8 votes
1 answer
370 views

Consequences of $MIP^\ast=RE$ Regarding Quantum Algorithms

8 votes
1 answer
510 views

What is recursive Fourier sampling and how does it prove separations between BQP and NP in the black-box model?

8 votes
1 answer
239 views

Nielsen and Chuang's proof for 'approximating arbitrary unitary gates is generically hard'

  • 311
7 votes
3 answers
2k views

Hadamard gate as a product of $R_x$, $R_z$ and a phase

  • 441
7 votes
1 answer
167 views

Bob applies a projector - what happens to eigenvalues of Alice's reduced state?

  • 2,169
7 votes
1 answer
235 views

Does the GLOA have any advantage over the Solovay-Kitaev algorithm?

6 votes
2 answers
219 views

Can $|\Psi\rangle\simeq\sum_k |u_k\rangle|v_k\rangle$ be maximally entangled even if $\{|u_k\rangle\}_k,\{|v_k\rangle\}_k$ are not orthonormal?

  • 19.5k
6 votes
1 answer
548 views

Is there any 'official' list of errata for Nielsen & Chuang?

  • 4,898
6 votes
1 answer
193 views

Adding a phase to qubit: why is it necessary for arbitrary single qubit gate

5 votes
1 answer
408 views

How can the Holevo bound be used to show that $n$ qubits cannot transmit more than $n$ classical bits?

  • 1,145
5 votes
1 answer
339 views

Showing that Matrix Inversion is BQP-complete - HHL Algorithm

5 votes
1 answer
556 views

What are examples of non-trivial POVM measurements?

  • 3,114
5 votes
1 answer
270 views

Is Connes' Embedding Problem akin to the word problem for finitely presented groups?

  • 7,866
5 votes
1 answer
333 views

Decomposition of any 2-level matrix into single qubit and CNOT gates

  • 811
5 votes
4 answers
176 views

Quantum teleportation and the reality of quantum states

  • 361
4 votes
1 answer
320 views

How to implement linear combination of two unitary gates in a quantum circuit?

  • 41
4 votes
1 answer
137 views

Can local projections increase entanglement?

  • 19.5k
4 votes
1 answer
336 views

Proof that any unitary can be written as $U=e^{-iH}$ with $H$ Hamiltonian with bounded norm

4 votes
1 answer
140 views

Is there a proof or example to show that a noiseless subsystem is not necessarily closed under addition?

4 votes
2 answers
711 views

Can classical linear algebra solvers implement quantum algorithms with similar speed-ups?

3 votes
2 answers
121 views

Example of a two-qudit state whose measurement outcomes are independent in one basis but dependent in another

  • 2,107
2 votes
1 answer
47 views

$N(\frac{1}{2},2)=3$ for vectors in a Hilbert Space

  • 1,145
2 votes
1 answer
112 views

Is it possible to detect the phase $\pi$ or 0 for the single qubit circuit X H P?

  • 306
2 votes
1 answer
186 views

N-Qubit Hadamard vs Quantum Fourier Transform

2 votes
1 answer
150 views

Nielsen & Chuang Theorem 2.6 Proof

1 vote
1 answer
58 views

How to compute the inverse of a unitary B when it's defined only by B|0⟩=XXXX?

  • 21