Abstract
Consider two physical systems that are separated in space and/or time, but are interacting, or have been interacting in the past. In order to study the states emerging after such an interaction, it is not enough to treat each system separately. They must be treated as a single Hilbert space, which unites the Hilbert spaces associated with the individual systems.
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Lvovsky, A.I. (2018). Entanglement. In: Quantum Physics. Undergraduate Lecture Notes in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-56584-1_2
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DOI: https://doi.org/10.1007/978-3-662-56584-1_2
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