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Constant-time Quantum Algorithm for Homology Detection in Closed Curves

by Nhat A. Nghiem Vu, Xianfeng David Gu, Tzu-Chieh Wei

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Submission summary

Authors (as registered SciPost users): Nhat A. Nghiem Vu
Submission information
Preprint Link: scipost_202302_00042v2  (pdf)
Date accepted: 2023-05-22
Date submitted: 2023-03-24 19:18
Submitted by: Nghiem Vu, Nhat A.
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Quantum Physics
Approach: Theoretical


Given a loop or more generally 1-cycle $r$ on a closed two-dimensional manifold or surface, represented by a triangulated mesh, a question in computational topology asks whether or not it is homologous to zero. We frame and tackle this problem in the quantum setting. Given an oracle that one can use to query the inclusion of edges on a closed curve, we design a quantum algorithm for such a homology detection with a constant running time, with respect to the size or the number of edges on the loop $r$. In contrast, classical algorithms take a linear time. Our quantum algorithm can be extended to check whether two closed loops belong to the same homology class. Furthermore, it can be applied to a specific problem in the homotopy detection, namely, checking whether two curves are not homotopically equivalent on a closed two-dimensional manifold.

Published as SciPost Phys. 15, 049 (2023)

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