Can small quantum systems learn
Open accessAbstract
We examine the question of whether quantum mechanics places limitations on the ability of small quantum devices to learn. We specifically examine the question in the context of Bayesian inference, wherein the prior and posterior distributions are encoded in the quantum state vector. We conclude based on lower bounds from Grover’s search that an efficient blackbox method for updating the distribution is impossible. We then address this by providing a new adaptive form of approximate quantum Bayesian inference that is polynomially faster than its classical anolog and tractable if the quantum system is augmented with classical memory or if the low–order moments of the distribution are protected through redundant preparation. This work suggests that there may be a connection between fault tolerance and the capacity of a quantum system to learn from its surroundings.
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Sufficiently powerful quantum computers can in principle provide computational speedups for key machine learning algorithms and subroutines such as data fitting, principal component analysis, Bayesian inference, Monte Carlo methods, support vector machines, Boltzmann machines, and recommendation systems.
“Sufficiently powerful quantum computers can in principle provide computational speedups for key machine learning algorithms and subroutines such as data fitting [4], principal component analysis [5], Bayesian inference [6,7], Monte Carlo methods [8], support vector machines [9,10], Boltzmann machines [11,12], and recommendation systems [13].”
From Continuous-variable quantum neural networks (2019) · cites this paper as [7]
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Continuous-variable quantum neural networks
Killoran, N., Bromley, T. R., Arrazola, J. M., Schuld, M., Quesada, N., & Lloyd, S. (2019) · Physical Review Research · doi:10.1103/physrevresearch.1.033063 · Cited by 418 · see citing works
- Authors
- Wiebe, N., & Grandade, C.
- ORCID
- Wiebe, Nathan
- Venue
- Quantum Information and Computation
- Publisher
- Rinton Press
- Published
- 2017-05
- Volume
- 17
- Issue
- 7&8
- Pages
- 568-594
- ISSN
- 1533-7146 (ISSN-L)
- OpenAlex
- W2191638898
- Cited by
- 26
- References
- 2
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 3 · 2016: 1
- FWCI
- 2.25
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Quantum Information and Computation (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- quantum machine learning, Bayesian inference, Grover's algorithm, lower bounds, black-box learning, adaptive learning, fault tolerance, small quantum systems
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