King, Robbie
(2021)
Bipartite Measurements in Minkowski Space.
[Preprint]
Abstract
We study the measurements which Alice and Bob can perform on a bipartite quantum system, where Alice and Bob are spacelike separated. For a measurement to be possible, it must be causal i.e. non-signalling. Within causal measurements, we define four notions of ‘localisability’. Each of the four classes of measurement restricts the actions of Alice and Bob in different ways, and we study their relative power. We end with a discussion of the difficulties posed by non-local measurements for the idea of wavefunction collapse.
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