Holographic entanglement ...

Holography has been around for a long time as it's the only real way to reconstruct a 3D image emitting from a 2D surface as described by Physorg.

Classical holography creates two-dimensional renderings of three-dimensional objects with a beam of laser light split into two paths. The path of one beam, known as the object beam, illuminates the holograph's subject, with the reflected light collected by a camera or special holographic film. The path of the second beam, known as the reference beam, is bounced from a mirror directly onto the collection surface without touching the subject.

The holograph is created by measuring the differences in the light's phase where the two beams meet. The phase is the amount that the waves of the subject and object beams mingle and interfere with each other, a process enabled by a property of light known as 'coherence."

But now, entanglement comes into play, promising a revolution in tech that's been around for a while.

Credit: University of Glasgow

In standard holography, the two paths would then be superimposed on each other, and the degree of phase interference between them would be used to generate a hologram on the camera. In the most striking aspect of the team's quantum version of holography, the photons never overlap with each other after passing through their respective targets.

Instead, because the photons are entangled as a single 'non-local' particle, the phase shifts experienced by each photon individually are simultaneously shared by both.

The interference phenomenon occurs remotely, and a hologram is obtained by measuring correlations between the entangled photon positions using separate megapixel digital cameras. A high-quality phase image of the object is finally retrieved by combining four holograms measured for four different global phase shifts implemented by the spatial light modulator on one of the two photons.

End result, much higher definition  of said holograms, expecially useful for medical imaging et al.

Spontaneous parametric down-conversion process can split photons into type II photon pairs with mutually perpendicular polarization.