In the article Fermilab is Building a ‘Holometer’ to Determine Once and For All Whether Reality Is Just an Illusion in Popular Science, the authors state:

Researchers at Fermilab are building a “holometer” so they can disprove everything you thought you knew about the universe. More specifically, they are trying to either prove or disprove the somewhat mind-bending notion that the third dimension doesn’t exist at all, and that the 3-D universe we think we live in is nothing more than a hologram.

Now before you start wondering whether today is April first, they do provide a link to the Fermi Lab web site section devoted to presentations about the holometer.

There you can read the 2009 Holometer Proposal.  Maybe the following quote explains it better than the Popular Science article:

The theory of black hole evaporation, whereby a black hole state converts to free quantum particle states in flat spacetime, also suggests a fundamental bound at the Planck scale. The correspondence is remarkably precise: the entropy of a black hole, identified with the total number of degrees of freedom, is one quarter of the area of its event horizon in Planck units. This idea has led to the conjecture that all of physics may be “holographic”, encoded in some way on null surfaces or light sheets at Planck resolution. However, there has been no experimental test of this conjecture.

For your information they state that Planck time = 5.4 X 10^-44 seconds.