Not anywhere near room temperature, anyways. Plus it's not particularly helpful to store data in a single atom when it takes a much larger device to read the da

Not anywhere near room temperature, anyways. Plus it's not particularly helpful to store data in a single atom when it takes a much larger device to read the data. NAND flash cells are already about as small as they can be, but now they're being stacked on top of each other for better density. This is a much more promising avenue. Holographic storage also leverages the third dimension for huge increase in density compared to traditional optical drives.