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Quantum Computing : Recent Questions and Answers (Page 73)

Find answers to your questions about Quantum Computing or help others by answering their Quantum Computing questions.

Grover's Search applied to Schöning's Algorithm

In this paper by Ambainis, he talks about the applicability of Grover's Search to Schöning's algorithm for solving the 3SAT problem to obtain a runtime of ...

Asked on 11/29/2020 by usercs

1 answer

Problems in understanding the solution for "Mermin–Peres Magic Square Game"

I am referring to the article Advanced Topics in Quantum Information Theory exercise 4 and to the MS Quantum Kata MS-Quantum-Kata which describes a...

Asked on 11/27/2020 by mbuchberger1967

1 answer

Nielsen & Chuang Exercise 2.55: Prove that $exp left[ -frac{iH(t_2 - t_1)}{hbar} right]$ is unitary

$newcommand{expterm}[0]{frac{-iH(t_2 - t_1)}{hbar}}newcommand{exptermp}[0]{frac{iH(t_2 - t_1)}{hbar}}$Nielsen & Chuang (10th edition, page 82) states that $H$ is a fixed Hermitian operator known as the Hamiltonian. In exercise 2.54, we...

Asked on 11/26/2020 by Attila Kun

1 answer

How to solve QUBO problems in Q#?

Short version:I'm trying to solve a traveling salesman problem very similar to the traveling Santa example here: http://quantumalgorithmzoo.org/traveling_santa/, which is also included in the samples of the...

Asked on 11/26/2020 by Rufus1123

1 answer

How can I obtain a unitary matrix of quantum circuit with angles as parametric?

I need to draw a quantum circuit in Clifford+T library and obtain automatically its transformation matrix. (I received a response to this part of my question before in the link:...

Asked on 11/17/2020 by Moein sarvaghad

1 answer

Implementing Partial Trace in IBMs quantum computer

I am trying to implement the partial trace operation on IBMs quantum computer. I am simulating the depolarising channel with the following code#aim here is to build the decoherence...

Asked on 11/14/2020

2 answer

Why does the entangled pair need to be entangled to perform teleportation?

Why does the entangled pair (the mechanism of teleportation) need to entangle to start with in order for the teleportation to proceed? After you perform the Bell measurement, doesn't it...

Asked on 11/04/2020 by Lucas D.

1 answer

Indexing an "unknown" quantum state

Assuming I have a state$$|xrangle = frac{1}{sqrt{n}}sum_n |x_nrangle$$where $|x_nrangle$ are quantum state vectors$$|x_nrangle = frac{1}{|x_n|}sum_i x_{in}|irangle$$and that I have a unitary $U:|x_nrangle...

Asked on 10/27/2020 by ikiga1

1 answer

Papers on classical optimization in QAOA

Are there any papers on the classical optimization part of QAOA?What is the most efficient method now? And how is the classical optimization classified?...

Asked on 10/26/2020 by shxtxn

1 answer

Why does the Hadamard gate satisfy $H|xrangle=frac{1}{sqrt2}sum_{zin{0,1}}(-1)^{xz}lvert zrangle$?

I'm studying Deutsch–Jozsa algorithm and I don't understand this passage about Hadamard gate result: $$newcommand{ket}[1]{lvert #1rangle}Hket x=frac{1}{sqrt2}(ket0+(-1)^xket1)=frac{1}{sqrt2}sum_{zin{0,1}}(-1)^{xz}ket z$$ Why this equivalence is true? In particular, what is $z$?...

Asked on 10/22/2020 by Quarzo

2 answer

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