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@article{Bong_NatPhys_2020,
	abstract = {Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner's friend paradox. This is a thought experiment addressing the quantum measurement problem---the difficulty of reconciling the (unitary, deterministic) evolution of isolated systems and the (non-unitary, probabilistic) state update after a measurement. Here, by building on a scenario with two separated but entangled friends introduced by Brukner, we prove that if quantum evolution is controllable on the scale of an observer, then one of `No-Superdeterminism', `Locality'or `Absoluteness of Observed Events'---that every observed event exists absolutely, not relatively---must be false. We show that although the violation of Bell-type inequalities in such scenarios is not in general sufficient to demonstrate the contradiction between those three assumptions, new inequalities can be derived, in a theory-independent manner, that are violated by quantum correlations. This is demonstrated in a proof-of-principle experiment where a photon's path is deemed an observer. We discuss how this new theorem places strictly stronger constraints on physical reality than Bell's theorem.},
	author = {Bong, Kok-Wei and Utreras-Alarc{\'o}n, An{\'\i}bal and Ghafari, Farzad and Liang, Yeong-Cherng and Tischler, Nora and Cavalcanti, Eric G. and Pryde, Geoff J. and Wiseman, Howard M.},
	date = {2020/12/01},
	date-added = {2022-04-23 11:01:48 +0800},
	date-modified = {2022-04-23 11:02:05 +0800},
	doi = {10.1038/s41567-020-0990-x},
	id = {Bong2020},
	isbn = {1745-2481},
	journal = {Nature Physics},
	number = {12},
	pages = {1199--1205},
	title = {A strong no-go theorem on the Wigner's friend paradox},
	url = {https://doi.org/10.1038/s41567-020-0990-x},
	volume = {16},
	year = {2020},
	bdsk-url-1 = {https://doi.org/10.1038/s41567-020-0990-x}}