Wigner's Friend effects survive in a quantum-Darwinism decoherence model, but they are confounded by classical ignorance and suppressed as the Friend grows larger.
Thought experiments in a quantum computer
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abstract
We introduce a software package that allows users to design and run simulations of thought experiments in quantum theory. In particular, it covers cases where several reasoning agents are modelled as quantum systems, such as Wigner's friend experiment. Users can customize the protocol of the experiment, the inner workings of agents (including a quantum circuit that models their reasoning process), the abstract logical system used (which may or not allow agents to combine premises and make inferences about each other's reasoning), and the interpretation of quantum theory used by different agents. Our open-source software is written in a quantum programming language, ProjectQ, and runs on classical or quantum hardware. As an example, we model the Frauchiger-Renner extended Wigner's friend thought experiment, where agents are allowed to measure each other's physical memories, and make inferences about each other's reasoning.
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Emergence of Classicality in Wigner's Friend Scenarios
Wigner's Friend effects survive in a quantum-Darwinism decoherence model, but they are confounded by classical ignorance and suppressed as the Friend grows larger.