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Kvantu klejošana grafos

Authors: Ševcovs, Kirils;

Kvantu klejošana grafos

Abstract

We study a quantum walk based search algorithm on a finite two-dimensional grid. The search problem is as follows: we have a search space of $N$ items arranged into two-dimensional $\sqrt{N} \times \sqrt{N}$ grid. We search for the marked element on this grid using a well known quantum walk algorithm. This algorithm finds the marked location in $O(\sqrt{N \log N})$ steps. Currently no one can either prove that this running time is optimal, or provide a better algorithm. We try to approach this problem from two sides --- quantum walks on assymetric two-dimensional grid, and quantum walks on randomly generated graphs. As a result of our experiments we have found three assymetric grids on which quantum walks show interesting results.

Šajā darbā tiek pētīta meklēšana divdimensionālā režģi ar kvantu klejošanas palīdzību. Mums ir $N$ virsotnes, kas ir izkārtotas $\sqrt{N} \times \sqrt{N}$ režģī. Mēs meklējam uz šī režģa iezīmēto elementu ar kvantu klejošanas palīdzību. Šobrīd labākais algoritms atrod iezīmēto elementu pēc $O(\sqrt{N \log N})$ soļiem, un nav skaidrs, vai šis soļu skaits ir optimāls. Mēs mēģinam pieiet šai problēmai no divām pusēm --- pētot kvantu klejošanu asimetriskos (taisnstūra) režģos un klejošanu nejaušos grafos. Eksperimentu rezultātā tika atrasti trīs asimetrisko režģu gadījumi uz kuriem ir interesanti kvantu klejošanas rezultāti.

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Latvia
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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