Tomer Stav, Arkady Faerman, Elhanan Maguid, Dikla Oren, Vladimir Kleiner, Erez Hasman, Mordechai Segev.
Metamaterials constructed from deep subwavelength building blocks have been used to demonstrate phenomena ranging from negative refractive index and e-near-zero to cloaking, emulations of general relativity, and superresolution imaging. More recently, metamaterials have been suggested as a new platform for quantum optics.We present the use of a dielectric metasurface to generate entanglement between the spin and orbital angular momentum of photons.We demonstrate the generation of the four Bell states on a single photon by using the geometric phase that arises from the photonic spin-orbit interaction and subsequently show nonlocal correlations between two photons that interacted with the metasurface. Our results show that metamaterials are suitable for the generation and manipulation of entangled photon states, introducing the area of quantum optics metamaterials.
Figure: Entanglement between spin and OAM on a single photon
A single photon vertically polarized is arriving from the left, as illustrated by the yellow wave packet representing the electric field amplitude. This photon carries zero OAM, as illustrated by the yellow flat phase fronts. The single photon passes through the metasurface nanoantennas (purple) and exits as a single-particle entangled state, depicted as a superposition of the red and blue electric field amplitudes, with the corresponding vortex phase fronts opposite to one another.
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