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Relations between different definitions of the quantum Wasserstein distance for qubits

arXiv Quantum Physics
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⚡ Quantum Brief
Géza Tóth and József Pitrik demonstrate that two competing definitions of quantum Wasserstein distance—proposed separately by Golse et al. and De Palma-Trevisan—converge for qubit systems when the cost function involves a single operator. The study resolves a theoretical gap by proving these previously distinct frameworks become mathematically equivalent under specific conditions, simplifying comparisons in quantum information theory. A key consequence is that the "self-distance" (distance between identical states) in this unified framework equals the Wigner-Yanase skew information, a well-known measure of quantum uncertainty. Published in May 2026, the work focuses exclusively on qubits, leaving open whether the equivalence extends to higher-dimensional quantum systems like qutrits or continuous-variable states. This unification may streamline quantum machine learning and optimal transport applications by providing a consistent distance metric for qubit-based algorithms.
Relations between different definitions of the quantum Wasserstein distance for qubits

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Quantum Physics arXiv:2605.03027 (quant-ph) [Submitted on 4 May 2026] Title:Relations between different definitions of the quantum Wasserstein distance for qubits Authors:Géza Tóth, József Pitrik View a PDF of the paper titled Relations between different definitions of the quantum Wasserstein distance for qubits, by G\'eza T\'oth and 1 other authors View PDF HTML (experimental) Abstract:The quantum Wasserstein distances defined by Golse, Mouhot, Paul, and Caglioti and by De Palma and Trevisan coincide for qubits when a single operator appears in the cost function. As a consequence, the self-distance equals the Wigner-Yanase skew information in this case. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.03027 [quant-ph] (or arXiv:2605.03027v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.03027 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Géza Tóth [view email] [v1] Mon, 4 May 2026 18:01:04 UTC (13 KB) Full-text links: Access Paper: View a PDF of the paper titled Relations between different definitions of the quantum Wasserstein distance for qubits, by G\'eza T\'oth and 1 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-05 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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Source: arXiv Quantum Physics