Quantum entanglement can be endlessly 'embezzled' from quantum fields

Entanglement is one of the most valuable resources in the quantum realm – for instance, it is the powerhouse behind quantum encryption – and in theory, it may be possible to extract an infinite amount of it from the universe.

Interacting with a quantum field usually changes its state, but Henrik Wilming at Leibniz University Hannover in Germany was looking for cases when this can be avoided. This led him to the idea of “quantum…