Quantum protocols for the millionaire problem with a third party are trivial · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1207.6739/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTQuantum protocols for the millionaire problem with a third party are trivial — mentioned by scythehttps://news.ycombinator.com/item?id=6163564urn:hackerpapers:mention:1207.6739:6163564Mon, 05 Aug 2013 22:26:11 GMT<p>&gt; Quantum crypto only helps with eavesdropping. To defend against man-in-the-middle attacks you have to use a conventional message authentication code. The system is no stronger than the MAC. False. See e.g. &quot;Quantum protocols for the millionaire problem are trivial&quot;, He 2012 http://arxiv.org/pdf/1207.6739 &gt; Quantum nondemolition measurements have been used to detect macroscopic objects with a vanishing probability of interaction. There is a good chance the approach can be adapted to detect photons. Interaction-free measurement has certainly been demonstrated, but it doesn&#x27;t do what you think…</p><p><a href="https://hackerpaper.kaipfister.de/p/1207.6739/">Paper and discussion history</a>. A mention is not an endorsement.</p>quant-ph