I am sitting here, on the bench, with a coffee in one hand and a cigarette in the other, contemplating the black and starry sky. I'm dragging smoke from the cigarette and drink some coffee!
I'm thinking of the light that crosses the Universe all the way from the farthest stars and a strange idea does not give me peace. It's like a mosquito that irritates me with its perpetual buzz. Does the light that comes to us from far away, contains quantum information like the one I produce in the laboratory with the help of mirrors, beam splitters and prisms?
We use to encode quantum information in photons by manipulating the polarization and orbital angular momentum (OAM) of photons. It’s a tedious work, but in the end, twisting the polarization and creating OAM, using beam splitters and prisms, a quantum message is stored in a tiny single photon.
I'm dragging smoke from the cigarette and drink some coffee!
Surprisingly, dead stars can provide a plausible answer to the question. Remarkably, our laborious work in the lab is easily done by gravity around rotating black holes. Black holes are changing the “face” of the surrounding spacetime, it curves it and it twists it. While traveling through this distorted spacetime, the photons twist the polarization and create OAM. Finally, when leaving the gravity of the black hole, photons have a quantum message stored.
Unbelievable, a quantum computer already exists in nature!
I'm dragging another smoke from the cigarette! And still, what an irony!, I think, the gravity is creating the “spooky action at a distance”. I wonder what Einstein would have said about this? , as I finish my last drop of coffee.
I finish the cigarette and it's time to put on paper all these thoughts that you can find in my newly published research in New Astronomy journal (Creation of single-photon entangled states around rotating black holes - https://doi.org/10.1016/j.newast.2017.09.001).
It just remains to decipher the quantum message that the black holes send us. This requires another coffee and another cigarette!