2 votes

Why is the Lattice of a crystal required to have at least as much symmetry as its motif?

After inspection of the source you mention, I am not entirely sure about what they meant by impossible but here is my take. The structure they describe should be possible. However, because of the ...
1 vote

Quantum Entanglement as a Paradox

The nonlinear process in the crystal produces entangled photon pairs, but the reason for the entanglement is the fact that energy and momentum needs to be conserved. It does not need a wormhole for ...
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