Classical data can be copied and re-used for computation, with adverse consequences economically and in terms of data privacy. Motivated by this, we formulate problems in one-way communication complexity where Alice holds some data x and Bob holds m inputs y_1, …, y_m. They want to compute m instances of a bipartite relation R(⋅,⋅) on every pair (x, y_1), …, (x, y_m). We call this the asymmetric direct sum question for one-way communication. We give examples where the quantum communication complexity of such problems scales polynomially with m, while the classical communication complexity depends at most logarithmically on m. Thus, for such problems, data behaves like a consumable resource that is effectively destroyed upon use when the owner stores and transmits it as quantum states, but not when transmitted classically. We show an application to a strategic data-selling game, and discuss other potential economic implications.
@InProceedings{gilboa_et_al:LIPIcs.APPROX/RANDOM.2025.39, author = {Gilboa, Dar and Jain, Siddhartha and McClean, Jarrod R.}, title = {{Consumable Data via Quantum Communication}}, booktitle = {Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2025)}, pages = {39:1--39:23}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-397-3}, ISSN = {1868-8969}, year = {2025}, volume = {353}, editor = {Ene, Alina and Chattopadhyay, Eshan}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.APPROX/RANDOM.2025.39}, URN = {urn:nbn:de:0030-drops-244059}, doi = {10.4230/LIPIcs.APPROX/RANDOM.2025.39}, annote = {Keywords: quantum communication, one-time programs, data markets} }
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