Gadolinium Gallium Garnet Quantum Electronic Processors (GGGQEP)

Gadolinium Gallium Garnet (GGG, Gd3Ga5O12) Quantum Electronic Processors (QEP) are a hypothetical electronic circuit that operates by stimulation of quantized radiation through the medium of a gadolinium gallium garnet, a synthetic crystal. It was reported to be a data storage method by unknown persons, though there has been no public demonstration of such technology to date.

In the development of computer memory during the 1960s and 1970s, gadolinium gallium garnets were used as a non-magnetic substrate for growing a thin magnetic garnet crystal film used in the fashioning of bubble memory chips, but this technology was surpassed in performance by semiconductor memory chips and development was subsequently abandoned by manufacturers.

Reading

 * "The following is a theoretical data storage method that untilizes a sythetic crystal called 'GGG' or 'Gadolinium Gallium Garnet'. It is manufactured as a diamond sythetic, and is derived from 'Gadolinium Gallium Oxide'. These are transparent crystaline solids with a high hardness and density. With 3 powerful lasers, you burn out a point within the crystal, and with a scanning device... read data from it. You can only read and write; you cannot delete or rewrite the data."
 * "You only need three lasers to write the data and one to read. It’s the same technology as 3D glass etching. If you double its size to 10cm^3, then you have 8 times the storage, and even if you are not atomically precise, you could hold two internets."