We all think it's called entanglement.
But what we think is not what he meant.
The proper translation
of Schrodinger's version,
Verschrankung, is more like entwinement!
The multiport is a thing nefarious.
The ways of construction are various.
With phases and mirrors,
and bewaring of errors,
the setups we build are precarious
The physics of optical fibers
present us with effects diverse
that will pulses reshape
with components that light do disperse.
A splitter for three is a tritter.
In labs he's a popular critter.
A quarter is for four
and the device for more,
the splitter for five, is a quitter.
Photons in pairs have a quality
with no regard for reality
when on paths that don't meet
they non-locally beat
testing a Bell inequality.
Writing with a cramp in the finger,
references include Schrodinger,
Einstein and Podolsky,
Rosen cum Zukowski,
with Greenberger, Horne, and Zeilinger.