15th Experimental Chaos and Complexity Conference - ECC15, Madrid (España). 04-07 junio 2018
Resumen:
Random number generators are key in many areas: data security, numerical simulations, online games of chance, etc. Classical generators can be either insecure or slow. Recent solutions that avoid both problems include doped weakly coupled semiconductor superlattices which, operated at room temperature [1] can produce spontaneous chaotic oscillations. This can be exploited to generate true random numbers fast enough and with little post-processing. Under DC voltage bias, idealized superlattices [2] show self-sustained chaotic behavior for certain voltage intervals. If external and internal noise is taken into account, these voltage intervals can be made broader and the chaotic response enhanced. Thus, establishing superlattices as a robust physical entropy source. Another feature seen both in experiments [3] and numerical simulations [4] is coherence resonance: external band limited voltage noise of sufficient amplitude induces regular current self-oscillations in states that are stationary in the absence of noise. Furthermore, when a weak AC voltage signal is applied, coherence resonance triggers a stochastic resonance. That is, the current response is both phase locked to the AC signal and amplified, in the sense of a higher signal to noise ratio.
Resumen divulgativo:
Las superredes semiconductoras débilmente acopladas tienen un comportamiento no lineal que las vuelve tecnológicamente interesantes. En esta charla nos centramos en las interacciones constructivas con el ruido, que permite detectar la presencia de señales ocultas por el ruido de fondo.
Fecha de publicación: 2018-06-04.
Cita:
E. Mompó, M. Ruiz-Garcia, M. Carretero, L.L. Bonilla, Chaotic behavior and coherence resonance in semiconductor superlattices at room temperature, 15th Experimental Chaos and Complexity Conference - ECC15, Madrid (España). 04-07 junio 2018.
