# Physicist Publishes Method For Communicating With Parallel Universes Source: https://www.youtube.com/watch?v=Zx3Elz554ZM Recap page: https://rapidrecap.app/video/Zx3Elz554ZM Generated: 2026-02-12T16:37:28.429+00:00 --- ## Quick Overview Physicist Maria Violaris details a thought experiment demonstrating that communication between distinct branches of an Everettian multiverse, previously thought impossible without violating quantum theory linearity, is actually possible entirely within standard quantum theory using a technique involving Wigner's friend and a global unitary operation that swaps observer branches. **Key Points:** - Maria Violaris, a physicist from the University of Oxford, presents a thought experiment showing inter-branch communication in an Everettian multiverse is possible within standard quantum theory (0:00, 2:13). - The method relies on a Wigner's friend scenario where the friend, in superposition, sends a message written by a distinct copy of themselves to the observer (Wigner) using a global unitary exchange operation (2:35, 2:47). - Crucially, the observer who writes the message loses memory of it, while the observer who never wrote it gains the message, maintaining the unitarity of quantum theory (2:50, 3:33). - The video critiques the common belief that quantum mechanics is inherently random, comparing the expected 50/50 outcome of a measurement to the actual 70/30 split implied by the paper's logic (3:37, 4:31). - The author labels the idea that the observer loses memory of writing the message as 'practically' bullsh*t, despite the protocol being mathematically compatible with the Schrödinger equation (3:38, 4:50, 4:36). - The video features a survey showing the Copenhagen interpretation is favored by 36% of respondents, followed by epistemic/information-based approaches (17%) and Many-worlds/consistent histories (15%) (1:17). - The presenter promotes NordVPN as a sponsor, offering four months off the first year with code SABINE (5:45). ![Screenshot at 2:13: The title slide of the paper, "Quantum observers can communicate across multiverse branches" by Maria Violaris, setting the context for the theoretical discussion on inter-branch communication.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-02-13.jpg) **Context:** The video discusses a theoretical paper by Maria Violaris from the University of Oxford, dated January 2026, which challenges conventional wisdom regarding the limits of what is possible in an Everettian (Many-Worlds) multiverse. The central topic is whether observers in different branches of the multiverse can communicate, a concept typically considered impossible without violating the linearity of quantum mechanics. ## Detailed Analysis Sabine Hossenfelder reports on a new paper by Maria Violaris from Oxford suggesting that communication between distinct branches of an Everettian multiverse is possible while remaining consistent with standard quantum theory, specifically by preserving unitarity. The thought experiment involves Wigner's friend, where the friend, in superposition, sends a message written by a distinct copy of themselves, aided by Wigner. The protocol requires creating a superposition of the observer, having one branch write the message, and then applying a global unitary operation that exchanges the observer branches. The surprising result is that the observer who wrote the message loses memory of having done so, while the observer who never wrote it gains the message (2:50, 3:33). Hossenfelder notes that while the mathematical framework (Schrödinger equation) is compatible, the requirement that the writer observer forgets the action is problematic, rating the paper's interpretation as 'practically' bullsh*t (4:31, 4:50). She contrasts the expected 50/50 probability of a random measurement outcome with the paper's implied 70/30 split (4:31). The video also shows survey data indicating the Copenhagen interpretation is the most favored explanation for quantum mechanics among physicists (36%). The video concludes with a promotion for NordVPN. ### The Core Argument - Inter-branch communication is possible within standard quantum theory using a Wigner's Friend protocol - The protocol involves a global unitary exchange after one observer branch writes a message - The writer loses memory, the non-writer gains the message, maintaining unitarity (2:35, 3:33) ### Quantum Interpretation Survey Data - Copenhagen interpretation leads with 36% favoring it, followed by Epistemic/Information-based approaches (17%) and Many worlds/consistent histories (15%) (1:17) ### Critique and Conclusion - The premise that the writing observer forgets the action is deemed 'practically' nonsense, despite mathematical compatibility with the Schrödinger equation - The paper's implications challenge classical notions of randomness in measurements (4:31, 4:48) ### Sponsor Segment - NordVPN advertisement promoting secure browsing and the ability to bypass geo-blocks by selecting servers in different countries, offering a special deal with code SABINE (5:08, 5:45) ![Screenshot at 0:00: Sabine Hossenfelder introduces the segment on parallel universes.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-00-00.jpg) ![Screenshot at 0:24: A roulette wheel spins, used as an analogy for randomness versus predictability in quantum mechanics.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-00-24.jpg) ![Screenshot at 1:17: A bar chart displays the results of a survey on favoured explanations of quantum mechanics, showing Copenhagen interpretation leading at 36%.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-01-17.jpg) ![Screenshot at 2:34: A graphic illustrating the branching of the universe \(represented by two Einstein images A and B\) after a measurement device splits the outcome, symbolizing the Many-Worlds interpretation.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-02-34.jpg) ![Screenshot at 4:31: A meter graphic indicating the paper's interpretation scores 4 out of 10 on the 'BULLSHIT' scale.](https://ss.rapidrecap.app/screens/Zx3Elz554ZM/00-04-31.jpg)