# @optica.worldwide on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/DXHOyI_jQqY
- **Gondola URL:** https://gondola.cc/posts/64223492-opticaworldwide-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/c27339f56c.jpg
- **Posted:** 2026-04-14T13:00:43.000+00:00
- **Account Owner:** Optica (@optica.worldwide) — https://gondola.cc/optica.worldwide

## Caption

Spontaneous parametric down-conversion.

Experimental set up used for the creation of entangled photons for a quantum Bell experiment.

A 355nm laser is used to pump a non-linear BBO crystal to create signal and idler fields at 710 nm, aligned such that the idler and signal photons are emitted in a single narrow cone co-axial with the pump beam axis; this is focused by a lens onto a knife-edge prism mirror that splits them into two different arms.

—Kevin J. Mitchell, UofGlasgow

#WorldQuantumDay #Quantum

## Stats

- **Views:** 0
- **Likes:** 228
- **Shares:** 0
- **Comments:** 1

## Tags

worldquantumday, quantum

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