  Until now, most memristor-based chaotic circuits proposed in the literature
are based on mathematical models which assume ideal characteristics such as
piece-wise linear or cubic non-linearities. The idea, illustrated here and
originating from the experimental approach for device characterization, is to
realize a chaotic system exploiting the non-linearity of only one memristor
with a very simple experimental set-up using feedback. In this way a simple
circuit is obtained and chaos is experimentally observed and is confirmed by
the calculation of the largest Lyapunov exponent. Numerical results using the
Strukov model support the existence of robust chaos in our circuit. This is the
first experimental demonstration of chaos in a real memristor circuit and
suggests that memristors are well placed for hardware encryption.
