Logical Stochastic Resonance with a Coulomb-Coupled Quantum-Dot Rectifier

Abstract

Noise is mostly considered to be an adverse factor in electronics. Yet, effects like logical stochastic resonance (LSR) can render electronic fluctuations useful. Here, we study LSR in a system consisting of two Coulomb-coupled quantum dots (QDs). We observe that voltage fluctuations applied to one of the QDs lead to a rectified and controllable current in the other QD. The interplay between applied noise and gate voltages enables our system to offer logic AND, OR, NAND, and NOR gate functionalities, which can be switched by either a variation of the noise or of a single gate voltage. For an optimal amount of noise, all four functionalities can be toggled by changing solely one single gate voltage. The presented results may prove beneficial for future autonomous, noise-tolerant, and energy-efficient electronics.

Half adder capabilities of a coupled quantum dot device

“…We simulated the system's dependence on V gb and on the input parameters according to the modelling in reference [21]. The following model parameters were used: Using the same parameters as for the simulation in Figure 1(b), we can model the output current's dependence on σ noise .…”

“…For an extended description of the basic operational details and theoretical backgrounds see references [20] and [21] as well as [10] and [11].…”

“…While the related basic research concentrates on the discovery and exploration of new beneficial concepts and mechanisms such as brownian motors, phonon rectifiers, SQUID ratchets or piezoelectric nanogenerators [4][5][6][7][8][9][10][11][12][13][14] more application-near engineering turns its attention to the elaboration of self-powered and sustainable electronic devices [15][16][17][18][19] . Recently, we demonstrated voltage rectification and logical stochastic resonance in a semiconductor system based on Coulomb-coupled quantum cavities 20,21 . Here, we explore this system's capability to be configured and utilized as a half adder.…”

Noise Tolerant Stochastic Logic Gate Circuits Synthesis using Genetic Algorithms

“…[13] and in the simulated experiment presented here, we are considering this particular gate as a building block for the combinational network. In such SLGs the logical function performed by the gate does not simply depend on the noise level (σ) but also on a second control parameter (V gb).…”

“…High and low are defined to be 0V and 0.6V respectively. The output current levels are defined to be high if I ≥ 15nA and to be low if I < 15nA [13].…”