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Newest 'quantum-algorithms' Questions - Quantum Computing Stack Exchange
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Learn more about TeamsQuestions tagged [quantum-algorithms]
For questions about quantum algorithms, that is, sequences of quantum gates, operations, and measurements, whose purpose which achieve some goal. Standard examples are Shor's and Grover's algorithms.
1,330 questions
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-4
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0
answers
26
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Será possível enviar mensagem para o passado? [closed]
It will be possible to communicate with yourself while being in the future
0
votes
1
answer
74
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How can QPE be used to determine whether any eigenvalue of an arbitrary matrix is (close to) zero?
I'm trying to find whether there are any eigenvalue of an arbitrary matrix that is (close to) zero without measurement using quantum phase estimation (QPE). I am experimenting with the code below. I'm ...
0
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0
answers
27
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Revealing a function value irrespective of the initial qubit state?
I've been exploring my idea
Of using Hadamard then applying f(1)=1 always. Combined with unknown function. And then Hadamard again as output.
Formaly:
Suppose I have a classical Boolean function f: {0,...
0
votes
0
answers
50
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How to make a phase oracle that marks the largest number?
I have a list of strategies each with a corresponding score, I want my oracle to apply the phase shift on the strategy with the largest score value. Without knowing the values beforehand how would I ...
0
votes
0
answers
71
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Cost comparison for quantum incrementers with dirty ancillae: Gidney (1 dirty) vs. Gidney (n dirty)
Häner et al. (Fig. 5, arXiv:1611.07995) build an $n$-bit constant adder, citing Gidney’s $n$-dirty ancillae incrementer (2015) for the sub-routine. However, in arXiv:1706.07884, there is a controlled ...
1
vote
2
answers
72
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Is there a way to assign different weights to and get the decoding edges from 2D graphs in each round when using pymatching to decode 3D graph
It seems that when decoding 3D graph, pymatching only gives the overall decoding edges and only takes spacelike-weights in 2D graph which means the weights are the same in each round.
So I'd like to ...
2
votes
1
answer
145
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Complexity of quantum simulation of sparse Hamiltonians algorithm
I'm reading "Efficient quantum algorithms for simulating sparse Hamiltonians" by Berry, Ahokas et al. and I'm having some doubts about its complexity. First, the sparse Hamiltonian is ...
1
vote
0
answers
55
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Can We find a quantum algorithm that can output all the subgroups of a finite group?
Just a simple curiosity, can we find a quantum algorithm that can give us all the subgroups of a finite group?
2
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0
answers
57
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Could Hallgren's Pell-equation algorithm be instantiated on an FTQC for interesting instances before other cryptographically relevant problems?
In the pantheon of great quantum algorithms with exponential speedup for problems with an NP-certificate, much attention has been given to the estimated time to when Shor's original factoring ...
1
vote
1
answer
87
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Understanding Quantum Singular Value Transformation from Gilyen et al, 2018
I try to understand the first pages of Gilyen et al, 2018 article introducing the Quantum Singular Value Transformation.
Here is a snapshot of the paragraph I have difficulties with :
This paragraph ...
1
vote
1
answer
90
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Is it any sense in using LLM for quantum error correction/mitigation?
The ML algorithms were successfully utilized for the Quantum Error Correction. Instead of training a model for this purpose. Wouldn't it be better to fine-tune the LLM for the QEC or Quantum Error ...
3
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1
answer
169
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How to do phase kickback when both control and target qubits are in superposition and use sign of phase coherently to control further operations?
Using the following circuit, I’m trying to do phase kickback to qubit 3, $q_3$, to change its state to $|1\rangle$ when the phase of $|q_2,q_1,q_0\rangle=|111\rangle$ is negative and $|q_3\rangle=|0\...
0
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0
answers
314
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Library import error in qiskit
I am new to quantum comupting qiskit library. I am trying to explore the optimization problems using qiskit. I found the following from the documentation
...
1
vote
1
answer
56
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How to reset ancilla after swapping when original ancilla flipping condition is not available?
Following little-endian format, I have the following state, which is part of a larger superposition of 6 qubits:
$$
\alpha|0\rangle_{swap\_ancilla}|010010\rangle + \beta|0\rangle_{swap\_ancilla}|...
1
vote
1
answer
50
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Mixed State vs Randomly Sampled Pure State
Suppose I have a set of orthogonal states
$$B := \{\psi_1, \ldots, \psi_m\}$$
Suppose I have $A$ that reads a quantum state and output 0/1. A want to verify the following are equivalent:
$$\Pr_{i}[A(|\...
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oracles × 41
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