Spinning black holes as quantum computers

Original title: "Creation of single-photon entangled states around rotating black holes"

The HN title call them quantum computers. This may be technically correct but it's an exaggeration, because it would be a 1-qbit or 2-qbit computer, not a general computer or at least more powerful than a calculator.

Also, it would be non programmable. Perhaps you can "program" it launching some asteroids into the black hole with the correct direction to make it rotate faster or slower, but it would be extremely inefficient and anyway it would not be useful to make any interesting calculation.

Warped spacetime near spinning black holes may create entangled states of photons; exactly in the manner a quantum computer processes the quantum information. A surprising marriage of general relativity and quantum information theory.