With some imagination, possible applications could for instance include molecular computers that perform logical operations based on molecular movements. (sciencedaily.com)
Scientists have also shown that ions, under certain conditions, can be made to perform quantum gates — logical operations between two quantum bits, similar to logic gates in classical circuits. (sciencedaily.com)
The circuit in this case has six different inputs, which can combine in different ways to execute one of 16 different logical operations. (sciencemag.org)