While most neuromorphic systems are based on nanoscale electronic devices,
nature relies on ions for energy-efficient information processing. Therefore,
finding memristive nanofluidic devices is a milestone toward realizing
electrolytic computers mimicking the brain down to its basic principles of
operations. Here, we present a nanofluidic device designed for circuit scale
in-memory processing that combines single-digit nanometric confinement and
large entrance asymmetry. Our fabrication process is scalable while the device
operates at the second timescale with a twenty-fold conductance ratio. It
displays a switching threshold due to the dynamics of an extended space charge.
The combination of these features permits assembling logic circuits composed of
two interactive nanofluidic devices and an ohmic resistor. These results open
the way to design multi-component ionic machinery, such as nanofluidic neural
networks, and implementing brain-inspired ionic computations