We introduce a quantum cloning game in which k separate collaborative parties receive a classical input, determining which of them has to share a maximally entangled state with an additional party (referee). We provide the optimal winning probability of such a game for every number of parties k, and show that it decays exponentially when the game is played n times in parallel. These results have applications to quantum cryptography, in particular in the topic of quantum position verification, where we show security of the routing protocol (played in parallel), and a variant of it, in the random oracle model.
@InProceedings{colissonpalais_et_al:LIPIcs.TQC.2025.2, author = {Colisson Palais, L\'{e}o and Escol\`{a}-Farr\`{a}s, Lloren\c{c} and Speelman, Florian}, title = {{A Quantum Cloning Game with Applications to Quantum Position Verification}}, booktitle = {20th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2025)}, pages = {2:1--2:17}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-392-8}, ISSN = {1868-8969}, year = {2025}, volume = {350}, editor = {Fefferman, Bill}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TQC.2025.2}, URN = {urn:nbn:de:0030-drops-240513}, doi = {10.4230/LIPIcs.TQC.2025.2}, annote = {Keywords: Quantum position verification, cloning game, random oracle, parallel repetition} }
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