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Updated: Dec 18, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Polarization whorls from M87* at the event horizon telescope
Alexandru Lupsasca1,2, Daniel Kapec1,3, Yichen Shi1
1Center for the Fundamental Laws of Nature, Harvard University, Cambridge, MA 02138, USA.
Abstract:
The event horizon telescope (EHT) is expected to soon produce polarimetric images of the supermassive black hole at the centre of the neighbouring galaxy M87. There are indications that this black hole is rapidly spinning. General relativity predicts that such a high-spin black hole has an emergent conformal symmetry near its event horizon. In this paper, we use this symmetry to analytically predict the polarized near-horizon emissions to be seen at the EHT and find a distinctive pattern of whorls aligned with the spin.
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