In a multiparty entangled quantum world, everything can be connected. Image: TheDigitalArtist.
In a multiparty entangled quantum world, everything can be connected. Image: TheDigitalArtist. 'Entanglement' is a ubiquitous concept in modern physics research: it occurs in subjects ranging from quantum gravity to quantum computing. In a publication that appeared in Physical Review Letters last week, UvA-IoP physicist Michael Walter and his collaborator Sepehr Nezami shed new light on the properties of quantum entanglement - in particular when many particles are involved. In the quantum world, physical phenomena occur that we never observe in our large scale everyday world. One of these phenomena is quantum entanglement , where two or more quantum systems share certain properties in a way that affects measurements on the systems. The famous example is that of two electrons that can be entangled in such a way that - even when taken very far apart - they can be observed to spin in the same direction, say 'clockwise' or 'counterclockwise', despite the fact that the spinning direction of neither of the individual electrons can be predicted beforehand.
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