Showing papers by "Yoshihito Amemiya published in 1997"
TL;DR: The unit device consists of four tunnel junctions and operates as a two-way switch for single-electron transport and computer simulation shows that the designed circuits perform the logic operations correctly.
Abstract: The unit device consists of four tunnel junctions and operates as a two-way switch for single-electron transport. Any combinational logic can be implemented by connecting identical unit devices into a cascade to build the tree of a BDD graph. Several sample designs are presented for logic circuits of NAND, NOR, exclusive-OR, and AND-OR combinational logic. Computer simulation shows that the designed circuits perform the logic operations correctly.
126 citations
Journal Article•
70 citations
TL;DR: This work presents a stochastic-response circuit for implementing Boltzmann machine neurons, a single-electron circuit operating under unstable conditions that can produce an output of a random 1–0 bit stream with the probability for anoutput of 1 controlled by an input signal.
Abstract: The inherent stochastic character of single-electron tunneling can be effectively utilized for creating novel electronic circuits having high-level functions. As a sample application, we present a stochastic-response circuit for implementing Boltzmann machine neurons. The circuit consists of a single-electron circuit operating under unstable conditions. It can produce an output of a random 1–0 bit stream with the probability for an output of 1 controlled by an input signal—a task that is difficult for conventional circuits using ordinary electronic devices.
40 citations
30 Jun 1997
TL;DR: In this paper, the authors studied the relaxation process for non-equilibrium electron distributions in two-dimensional ultrasmall tunnel junction arrays (2D-TJAs) using a Monte Carlo simulation.
Abstract: Relaxation processes for non-equilibrium electron distributions in two-dimensional ultrasmall tunnel junction arrays (2D-TJAs) have been studied using a Monte Carlo simulation. Many electrons initially placed in the central island diffuse outward due to single-electron tunneling. When we focus on the number of electrons in square shells dividing the 2D-TJA, the number of electrons strongly fluctuates in time to form electron bunching peaks, and the peaks are propagated to outer shells as a wave. This result indicates a self-organization of electrons in non-equilibrium TJAs, suggesting the possibility of applications based on a new algorithm.
14 citations
TL;DR: In this paper, the authors studied the relaxation process for non-equilibrium electron distributions in two-dimensional ultrasmall tunnel junction arrays (2D-TJAs) using a Monte Carlo simulation.
Abstract: Relaxation processes for non-equilibrium electron distributions in two-dimensional ultrasmall tunnel junction arrays (2D-TJAs) have been studied using a Monte Carlo simulation. Many electrons initially placed in the central island diffuse outward due to single-electron tunneling. When we focus on the number of electrons in square shells dividing the 2D-TJA, the number of electrons strongly fluctuates in time to form electron bunching peaks, and the peaks are propagated to outer shells as a wave. This result indicates a self-organization of electrons in non-equilibrium TJAs, suggesting the possibility of applications based on a new algorithm.
14 citations
TL;DR: In this paper, the authors proposed an annealing method as an effective way of operating quantum-cellular-automaton (QCA) systems, which are devices for computation that utilize the minimum energy state of electrons in a quantum cell system.
Abstract: We propose an annealing method as an effective way of operating quantum-cellular-automaton (QCA) systems, which are devices for computation that utilize the minimum energy state of electrons in a quantum cell system. A QCA system has an energy function with many local minima and therefore cannot be operated as desired if placed under the conditions of a thermodynamically open system. Accordingly, for successful operation of a QCA system (i.e., making the QCA system converge successfully to its minimum-energy state), we propose a method of operation based on the concept of thermodynamic annealing. We simulate the dynamics of various QCA logic-gate systems operated by this annealing method, and show that data processing in QCA systems can be carried out accurately by means of this annealing method. The applicability of QCA systems to non-Neumann parallel-processing computation is also described.
14 citations
TL;DR: In this article, a single-electron-tunneling circuit (SET-CA) was proposed to encode binary signals in cellular automata. But the computational complexity of the SET-CA circuits was not analyzed.
Abstract: We propose cellular automaton circuits that use single-electron-tunneling circuits (SET-CA). The unit cell consists of four intrinsic semiconductor islands and four single-electron-tunneling junctions. The dielectric constant of the intrinsic semiconductor is much larger than that of the junction insulator. The unit cell is charged with two single electrons. Polarization states of the two single electrons in the unit cell can be used to encode a binary signal. We designed various binary logic SET-CA circuits, and analyzed their operation by computer simulation. It was demonstrated that the SET-CA circuits having appropriate arrangements of the cells can perform correct signal transmission and elemental logic operations such as NOT, NAND, and NOR.
13 citations
Journal Article•
6 citations
TL;DR: A low dissipation of about 20 μW per cell circuit can be expected at 1 MHz operation; therefore, 105 or more cells that operate in parallel can be integrated into an LSI.
4 citations
08 Sep 1997
TL;DR: It is found, through computer simulation, that a stochastic response unit circuit can be made in a simple configuration using SET junctions, and the probability for an output of 1 can be controlled by the input voltages.
Abstract: We present a computer-aided design method for constructing a circuit for a Boltzmann-machine neuron, utilizing single-electron tunneling (SET) We have found, through computer simulation, that a stochastic response unit circuit can be made in a simple configuration using SET junctions, and the probability for an output of 1 can be controlled by the input voltages