AI Article Synopsis
- The text discusses the emerging field of "flat optics" in quantum optics, emphasizing its potential for creating polarization entanglement, which is currently underdeveloped in this area.
- It highlights a novel method to generate photon pairs with adjustable polarization entanglement using spontaneous parametric downconversion (SPDC) in a 400-nm GaP film, showcasing the flexibility offered by "flat" platforms.
- The research demonstrates that by varying the pump polarization, the team can control the entanglement of photon pairs, achieving significantly precise effects, including an ultranarrow Hong-Ou-Mandel effect, with implications for further advancements in hyperentanglement.
Article Abstract
The concept of "flat optics" is quickly conquering different fields of photonics, but its implementation in quantum optics is still in its infancy. In particular, polarization entanglement, strongly required in quantum photonics, is so far not realized on "flat" platforms. Meanwhile, relaxed phase matching of "flat" nonlinear optical sources enables enormous freedom in tailoring their polarization properties. Here we use this freedom to generate photon pairs with tunable polarization entanglement via spontaneous parametric downconversion (SPDC) in a 400-nm GaP film. By changing the pump polarization, we tune the polarization state of photon pairs from maximally entangled to almost disentangled, which is impossible in a single bulk SPDC source. Polarization entanglement, together with the broadband frequency spectrum, results in an ultranarrow (12 fs) Hong-Ou-Mandel effect and promises extensions to hyperentanglement.
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| http://dx.doi.org/10.1364/OL.458133 | DOI Listing |
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