Well, not a wormhole, but an interesting device, a pair of magnetic monopoles.
“consists of an interior spiral of ferromagnetic metal (bottom right) surrounded by two concentric spheres. The ferromagnet transmits magnetic field lines from one end of the device to the other. Meanwhile, a shell of yttrium barium copper oxide (a superconducting material, yellow) bends and distorts the magnetic field lines as they travel.An outer shell composed of “mu-metals” (used for shielding electronic devices, silver) perfectly cancels out the magnetic distortion of the superconductor, rendering the entire thing “magnetically invisible” from the outside. Dunk it all in a liquid nitrogen bath — superconductors only work at extremely low temperatures”
What surprises me is the simple combination of ferromagnetic, superconductor & mu-metal.