Quantum communication’ doesn’t mean you don’t need classical communication any more — all quantum communication protocols need classical communication at some point. For example, in the BB84 protocol that I describe in this post, classical messages need to be exchanged about the basis in which was measured and to ensure security by comparing some of the measurement outcomes.

Wavefunctions don’t have to overlap to create entanglement — you can for example entangle atoms by a virtual exchange of light (using their dipole moment and the resulting long-range interaction which extends far beyond the extend of wavefunctions).

Trying to make sense of quantum physics with the help of green tea.

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