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Results for grover's algorithm
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3 votes
1 answer
562 views

Consequences of Grover's algorithm

I want to look more closely at the consequences of the Grovers algorithm. As is well known, the algorithm provides a quadratic improvement compared to classical search algorithms. … Specifically, I would be interested in the implications of Grover's algorithm on modern cryptography. So how is the influence of grover's algorithm on cryptography. …
user avatar
11 votes
4 answers
3k views

Grover's algorithm in a nutshell

How can you use Grover's Algorithm to find the shortest path? … I still want to have a brief explanation of Grover's Algorithm (i.e. Grover's algorithm in a nutshell) but didn't get a sufficient answer yet. …
Hubert Schölnast's user avatar
6 votes
1 answer
116 views

Grover's algorithm not under an oracle?

I've learned about Grover's algorithm's optimal procedure, but I just read this blurb from wikipedia: Grover's algorithm is optimal up to sub-constant factors. … That is, any algorithm that accesses the database only by using the operator $U_ω$ must apply $U_ω$ at least a $1 − o(1)$ fraction as many times as Grover's algorithm. …
wavosa's user avatar
  • 449
2 votes
2 answers
565 views

Qubit demands of Grover's Algorithm

In other words, it seems that the qubit demands of Grover's algorithm should be $O(2^{n/2})$ to search $\{0,1\}^n$. … Doesn't this make Grover's algorithm substantially harder to implement than the classical analogue, which only uses $n$ bits? …
slithy_tove's user avatar
-2 votes
1 answer
120 views

Oracle in Grover's algorithm [duplicate]

In the Grover's algorithm, the solution is already in the Oracle in order to mark winning state(s). I just wonder if we already know the solution, why do we need to run a circuit ? …
lenhhoxung's user avatar
2 votes
2 answers
267 views

Grover's algorithm to maximize QUBO functions

How can I use Grover's algorithm to do this? I've been told to encode this cost function which I'm not sure of. And to use quantum annealing to maximize the cost function. … Where does Grover's algorithm comes in this? Thanks in advance! …
Van Peer's user avatar
  • 637
2 votes
1 answer
205 views

Connectivity in Grover's algorithm on real quantum computers

Everytime I execute Grover's search algorithm on IBM real quantum computers I get a wrong answer (it doesn't find the correct winner state) unless I use only 2 qubits. … Do I need each qubit to be connected to all the other ones in the circuit for Grover's algorithm to work? Here is the Python code I am using. …
Alfred's user avatar
  • 93
2 votes
0 answers
116 views

Length / transpilation issues with Grover's algorithm

I am doing a final project on grover's algorithm, and the premise would require an extremely large number of qubits. … The probabilties of the simulators themselves are upwards of 99%, but even after a two qubit Grover's algorithm, it shows as only 40ish %? …
Joel Anthony Collins's user avatar
1 vote
1 answer
317 views

Grover's algorithm for complex phases

Grover's algorithm traditionally inputs a phase oracle, $U_\omega$ such that $U_\omega | x \rangle = (-1)^{f(x)} | x \rangle$. The task is to find some $x$ such that $f(x) = 1$. … Of course, $N$ is the number of states, $4$, not the number of bits here, as Grover's algorithm is traditionally written as. …
Andrew Baker's user avatar
17 votes
3 answers
5k views

Grover's algorithm: a real life example?

The input for Grover's algorithm is $n = \log_2(N=8) = 3$ qubits, where the 3 qubits encode the indices of the dataset. … There are implementations for Grover's algorithm with an oracle for $n=3$ searching for |111>, e.g. …
01000001's user avatar
  • 171
4 votes
0 answers
199 views

Grover's algorithm for game tree

Scott Aaronson gives the outline of an algorithm to evaluate whether there exists a satisfying assignment for a given game tree. … The idea is to use Grover's search recursively, for each level of the tree. He notes the following problem with this approach. …
BlackHat18's user avatar
  • 1,629
16 votes
4 answers
2k views

Grover's Algorithm and its relation to complexity classes?

I am getting confused about Grover's algorithm and it's connection to complexity classes. … Furthermore the Grover's algorithm can be used as a subroutine. …
Quantum spaghettification's user avatar
1 vote
1 answer
1k views

Solve sudoku using Grover's algorithm

The Qiskit tutorial shows the application of Grover's Algorithm to solve a 2x2 sudoku. However, I don't understand how why its diffuser works as intended. …
Unl's user avatar
  • 25
6 votes
1 answer
1k views

Second reflection in the Grover's algorithm

When interpreted geometrically, the second phase of the Grover's algorithm which corresponds to inversion about the mean is interpreted as reflection over the original state. …
usercs's user avatar
  • 481
7 votes
1 answer
725 views

Implementation of Grover's Algorithm (minimum spanning tree)

I am trying to solve a minimum spanning tree problem using Grover's Algorithm. … To accomplish this I would need to search a list for the minimum weight or edge for each point, for example: Given the following list: How would one use Grover's algorithm to search for the minimum …
Maxwellsequations's user avatar

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