Tripartite Wigner’s friend scenario and its test

Author:

Ding D,Wang C,He Y Q,Hou T,Gao TORCID,Yan F LORCID

Abstract

Abstract Wigner’s friend thought experiment is intended to reveal the inherent tension between unitary evolution and measurement collapse. Inspired by the Wigner’s friend experiment, Brukner derives a no-go theorem for observer-independent facts, focusing on two entangled observers in their respective laboratories. We construct an extended Wigner’s friend scenario, including three laboratories, namely, Alice’s laboratory, Bob’s laboratory and Charlie’s laboratory, where Alice, Bob and Charlie are standing outside the laboratories while their friends are placed inside their own laboratories. To realize this scenario, we create a universal quantum circuit, especially the circuit realization of the state evolution and measurement inside each laboratory, simple but novel. We carry out experiments on the IBM quantum computers to test the primary circuits, i.e. state preparation, state evolution and measurement inside each laboratory. Furthermore, we perform the simulation of the quantum circuit via Q# quantum programming on a classical computer.

Funder

National Natural Science Foundation of China

Publisher

IOP Publishing

Subject

Condensed Matter Physics,Mathematical Physics,Atomic and Molecular Physics, and Optics

Reference29 articles.

1. Remarks on the mind-body problem;Wigner,1961

2. Quantum theory cannot consistently describe the use of itself;Frauchiger;Nat. Commun.,2018

3. A no-go theorem for observer-independent facts;Brukner;Entropy,2018

4. When Greenberger, Horne and Zeilinger meet Wigner’s friend;Leegwater,2018

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