Some quantum fields have an infinite amount of entanglement that can be extracted.
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Entanglement is one of the most valuable resources in the quantum realm and is, for example, the driving force behind quantum cryptography. Theoretically, it may be possible to extract an infinite number of quantum entanglements from the universe.
Normally, interaction with a quantum field changes its state, but Henrik Wilming of Leibniz University Hannover in Germany was looking for a case where this could be avoided. This gave him the idea of “quantum…”.
