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Exponential Quantum Space Advantage for Approximating Maximum Directed Cut in the Streaming Model

Published: 11 June 2024 Publication History

Abstract

While the search for quantum advantage typically focuses on speed­ups in execution time, quantum algorithms also offer the potential for advantage in space complexity. Previous work has shown such advantages for data stream problems, in which elements arrive and must be processed sequentially without random access, but these have been restricted to specially-constructed problems Le Gall, SPAA ‘06 or polynomial advantage Kallaugher, FOCS ‘21. We show an exponential quantum space advantage for the maximum directed cut problem. This is the first known exponential quantum space advantage for any natural streaming problem. This also constitutes the first unconditional exponential quantum resource advantage for approximating a discrete optimization problem in any setting.
Our quantum streaming algorithm 0.4844-approximates the value of the largest directed cut in a graph stream with n vertices using polylog(n) space, while previous work by Chou, Golovnev, and Velusamy FOCS ’20 implies that obtaining an approximation ratio better than 4/9 ≈ 0.4444 requires Ω(√n) space for any classical streaming algorithm. Our result is based on a recent O(√n) space classical streaming approach by Saxena, Singer, Sudan, and Velusamy FOCS ’23, with an additional improvement in the approximation ratio due to recent work by Singer APPROX ’23.

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cover image ACM Conferences
STOC 2024: Proceedings of the 56th Annual ACM Symposium on Theory of Computing
June 2024
2049 pages
ISBN:9798400703836
DOI:10.1145/3618260
This work is licensed under a Creative Commons Attribution International 4.0 License.

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Published: 11 June 2024

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Author Tags

  1. approximation algorithms
  2. graph algorithms
  3. quantum computing
  4. streaming and sketching
  5. sublinear algorithms

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  • Sandia National Laboratories
  • NSF (National Science Foundation)

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STOC '24
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STOC '24: 56th Annual ACM Symposium on Theory of Computing
June 24 - 28, 2024
BC, Vancouver, Canada

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