Next Article in Journal
Waxberry-Like Nanosphere Li4Mn5O12 as High Performance Electrode Materials for Supercapacitors
Next Article in Special Issue
Physical Simulations of High Speed and Low Power NanoMagnet Logic Circuits
Previous Article in Journal / Special Issue
Exponentially Adiabatic Switching in Quantum-Dot Cellular Automata
Article Menu

Export Article

Open AccessArticle
J. Low Power Electron. Appl. 2018, 8(3), 31;

Clock Topologies for Molecular Quantum-Dot Cellular Automata

Department of Electrical and Computer Engineering, Baylor University, Waco, TX 76798, USA
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 15 August 2018 / Accepted: 18 August 2018 / Published: 8 September 2018
(This article belongs to the Special Issue Quantum-Dot Cellular Automata (QCA) and Low Power Application)
Full-Text   |   PDF [1667 KB, uploaded 10 September 2018]   |  


Quantum-dot cellular automata (QCA) is a low-power, non-von-Neumann, general-purpose paradigm for classical computing using transistor-free logic. Here, classical bits are encoded on the charge configuration of individual computing primitives known as “cells.” A cell is a system of quantum dots with a few mobile charges. Device switching occurs through quantum mechanical inter-dot charge tunneling, and devices are interconnected via the electrostatic field. QCA devices are implemented using arrays of QCA cells. A molecular implementation of QCA may support THz-scale clocking or better at room temperature. Molecular QCA may be clocked using an applied electric field, known as a clocking field. A time-varying clocking field may be established using an array of conductors. The clocking field determines the flow of data and calculations. Various arrangements of clocking conductors are laid out, and the resulting electric field is simulated. It is shown that that control of molecular QCA can enable feedback loops, memories, planar circuit crossings, and versatile circuit grids that support feedback and memory, as well as data flow in any of the ordinal grid directions. Logic, interconnect and memory now become indistinguishable, and the von Neumann bottleneck is avoided. View Full-Text
Keywords: quantum-dot cellular automata; clock design; memory; in-plane crossing; computational grid quantum-dot cellular automata; clock design; memory; in-plane crossing; computational grid

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Blair, E.; Lent, C. Clock Topologies for Molecular Quantum-Dot Cellular Automata. J. Low Power Electron. Appl. 2018, 8, 31.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics



[Return to top]
J. Low Power Electron. Appl. EISSN 2079-9268 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top