An electronic device smaller than 100 nanometres (see nanofabrication). The electronic, magnetic, and optical properties of these devices are usually determined by quantum mechanics. A nanodevice could be as simple as a single molecule or a complex collection of many correlated units. An example of an existing nanodevice is a carbon nanotube, which can be used for conducting electricity or providing exceptional tensile strength. Future examples might include single-electron transistors and spintronic devices for quantum computers.