Quantum-inspired algorithms in practice

Juan Miguel Arrazola1, Alain Delgado1, Bhaskar Roy Bardhan1, and Seth Lloyd1,2

1Xanadu, Toronto, Ontario, M5G 2C8, Canada
2Massachusetts Institute of Technology, Department of Mechanical Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

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Abstract

We study the practical performance of quantum-inspired algorithms for recommendation systems and linear systems of equations. These algorithms were shown to have an exponential asymptotic speedup compared to previously known classical methods for problems involving low-rank matrices, but with complexity bounds that exhibit a hefty polynomial overhead compared to quantum algorithms. This raised the question of whether these methods were actually useful in practice. We conduct a theoretical analysis aimed at identifying their computational bottlenecks, then implement and benchmark the algorithms on a variety of problems, including applications to portfolio optimization and movie recommendations. On the one hand, our analysis reveals that the performance of these algorithms is better than the theoretical complexity bounds would suggest. On the other hand, their performance as seen in our implementation degrades noticeably as the rank and condition number of the input matrix are increased. Overall, our results indicate that quantum-inspired algorithms can perform well in practice provided that stringent conditions are met: low rank, low condition number, and very large dimension of the input matrix. By contrast, practical datasets are often sparse and high-rank, precisely the type that can be handled by quantum algorithms.

Please see this blog post for a summary of the work.

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► References

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[91] Lucas Lamata, "Quantum machine learning and quantum biomimetics: A perspective", arXiv:2004.12076, (2020).

[92] John Realpe-Gómez and Nathan Killoran, "Quantum-inspired memory-enhanced stochastic algorithms", arXiv:1906.00263, (2019).

[93] Seyran Saeedi, Aliakbar Panahi, and Tom Arodz, "Quantum Semi-Supervised Kernel Learning", arXiv:2204.10700, (2022).

[94] Yunting Li, Xiaopeng Cui, Zhaoping Xiong, Zuoheng Zou, Bowen Liu, Bi-Ying Wang, Runqiu Shu, Huangjun Zhu, Nan Qiao, and Man-Hong Yung, "Efficient molecular conformation generation with quantum-inspired algorithm", arXiv:2404.14101, (2024).

[95] SeungYeop Baik, Sicheol Sung, and Yo-Sub Han, "A Framework for Quantum Finite-State Languages with Density Mapping", arXiv:2407.02776, (2024).

[96] Daniel Chen, Yekun Xu, Betis Baheri, Samuel A. Stein, Chuan Bi, Ying Mao, Qiang Quan, and Shuai Xu, "Quantum-Inspired Classical Algorithm for Slow Feature Analysis", arXiv:2012.00824, (2020).

[97] Naoko Koide-Majima and Kei Majima, "Quantum-inspired canonical correlation analysis for exponentially large dimensional data", arXiv:1907.03236, (2019).

The above citations are from Crossref's cited-by service (last updated successfully 2024-08-10 10:06:23) and SAO/NASA ADS (last updated successfully 2024-08-10 10:06:24). The list may be incomplete as not all publishers provide suitable and complete citation data.