Electronic quantum holography (also known as quantum holographic data storage) is an information storage technology which can encode and read out data at unprecedented density storing as much as 35 bits per electron.
[1] In 2009, Stanford University's Department of Physics set a new world record for the smallest writing using a scanning tunneling microscope and electron waves to write the initials "SU" at 0.3 nanometers, surpassing the previous record set by IBM in 1989 using xenon atoms.
Before this technology was invented the density of information had not exceeded one bit per atom.
When the electrons in copper interact with the carbon monoxide molecules, they create interference patterns that create an electronic quantum hologram.
This hologram can be read like a stack of pages in a book,[3] and can contain multiple images at different wavelengths.