Modeling human cognition is challenging because there are infinitely many mechanisms
that can generate any given observation. Some researchers address this by constraining the …

Core quantum postulates including the superposition principle and the unitarity of evolutions
are natural and strikingly simple. I show that—when supplemented with a limited version of …

Despite the success of neural networks at solving concrete physics problems, their use as a
general-purpose tool for scientific discovery is still in its infancy. Here, we approach this …

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 …

Wigner’s friend and relational objectivity | Nature Reviews Physics Skip to main content Thank
you for visiting nature.com. You are using a browser version with limited support for CSS. To …

The Many-Worlds Interpretation (MWI) of quantum mechanics holds that there are many
worlds which exist in parallel at the same space and time as our own. The existence of the …

In his famous thought experiment, Wigner assigns an entangled state to the composite
quantum system made up of Wigner's friend and her observed system. While the two of them …

The scientific method relies on facts, established through repeated measurements and
agreed upon universally, independently of who observed them. In quantum mechanics the …

We propose a measurement theory for quantum fields based on measurements made with
localized nonrelativistic systems that couple covariantly to quantum fields (like the Unruh …

Treating reference frames fundamentally as quantum systems is inevitable in quantum
gravity and also in quantum foundations once considering laboratories as physical systems …