All Questions
Tagged with quirk quantum-gate
14 questions
0
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1
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93
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Multi-qubit rotation using Quirk
I was wondering, how can one perform a multi-qubit rotation in Quirk?
For example, if I want to simulate the magic-state distillation protocol, I need e.g. a $(IIZZZ)_{\pi/8}$ rotation of 5 qubits. Is ...
- 268
2
votes
1
answer
688
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Not understanding gates being generated by MCX in "recursion" mode
I was curious about the various ways of generating code for MCX when there are multiple controls. I saw that qiskit provided multiple algorithms for generating code, depending on the number of ...
- 751
1
vote
1
answer
205
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Manually calculating quantum circuit with custom gate
I am trying to calculate the state of this Quirk circuit by hand:
where U is a custom gate with 2x2 matrix:
From what I've read, I should be able to calculate the resultant amplitudes as:
(U⊗I⊗I).(...
1
vote
1
answer
263
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How to implement *nested* Grover search (in Quirk)?
$\newcommand{\ket}[1]{|#1 \rangle}$
$\newcommand{\bra}[1]{\langle #1 |}$
PS: I suppose this question could also ask "How to implement $2 \ket{s}\bra{s} - I$ for any (identifiable) $\ket{s} \in \...
- 374
1
vote
1
answer
339
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Implementation of quantum phase estimation in Quirk
after reading the chapter of QPE (Quantum phase estimation) in Nielsen, I wanted to try an implementation in Quirk. My idea was to apply the T-gate, from which I know the following relation $T|1\...
- 678
1
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1
answer
391
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Question about Grover algorithm implementation in the Quirk simulator
I want to implement the Grover iteration instead of the multi-control qubit implemented as in this picture:
I want to implement them like in this example of five qubits:
I mean how can I decompose ...
- 335
5
votes
0
answers
162
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Exact functions of a single-iteration Grover Search Algorithm's operators
I'm doing a practice assignment where I'm asked to identify specific features of the Grover Search Algorithm's second operator (picture in post, further on "$Us$"), which mirrors the system relative ...
- 51
1
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1
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105
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Explanation of the function of the circuit
I once experimented with the tool "quirk" and came to a gate, whose function I can not properly tap into. I'm working in the circuit with 4 bits, the last bit is negated, so from 0 to 1. On all 4 bits ...
user4961
2
votes
1
answer
275
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How to implement a $\frac{\theta}{2}$ rotation from $\theta$ rotation?
Is there a way to create a rotation gate which has half the angle of some implementable gate?
I am looking to implement a gate on Quirk which allows for standard time-dependent rotations
$$R_x(\...
- 217
8
votes
3
answers
2k
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Is there any method of adding two operators in a circuit?
I am trying to reconstruct the time evolution of a Hamiltonian on the quantum computing simulator, quirk. Ideally I would like to generalise this to any simulator. The unitary matrix is
$$U(t)=e^{-...
- 217
1
vote
1
answer
290
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Creating a time dependent custom gate in Quirk
I have created a $16\times 16$ unitary operator using a Hamiltonian by finding its exponential
$$U=\exp(-iH\delta t)$$
If I set $\delta t=1$ then I can take this matrix and input it into quirk using ...
- 217
2
votes
1
answer
1k
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Building a matrix corresponding to the teleportation circuit
I'm trying to build the matrix that corresponds to this quantum teleportation circuit, but it never works when I test it in the quirk simulator, I tried finding the matrix corresponding to every part ...
- 775
22
votes
3
answers
4k
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Toffoli gate as FANOUT
I was searching for examples of quantum circuits to exercise with Q# programming and I stumbled on this circuit:
From: Examples of Quantum Circuit Diagrams
- Michal Charemza
During my introductory ...
- 413
7
votes
1
answer
86
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How to avoid error when applying certain combinations of degree of freedom rotations using a quantum circuit?
When applying each of the six degree of freedom rotations (or certain combinations of them) in an SO(4) using quantum gates, the results I expected are produced. For example, the following circuit in ...
- 183