Quantum-dot cellular automata: computing with coupled quantum dots

1999 ◽  
Vol 86 (5) ◽  
pp. 549-590 ◽  
Author(s):  
WOLFGANG POROD ◽  
CRAIGS LENT ◽  
GARY H. BERNSTEIN ◽  
ALEXEI O. ORLOV ◽  
ISLAMSHA HAMLANI ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Coupled Quantum Dots ◽  
Quantum Dot Cellular Automata

Quantum-dot Cellular Automata

2001 ◽  
Vol 696 ◽  
Author(s):  
Gregory L. Snider ◽  
Alexei O. Orlov ◽  
Ravi K. Kummamuru ◽  
Rajagopal Ramasubramaniam ◽  
Islamshah Amlani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Low Temperatures ◽  
Tunnel Junctions ◽  
Operating Temperature ◽  
Building Blocks ◽  
Quantum Dot Cellular Automata ◽  
Background Charge ◽  
Metal Islands

AbstractAn overview is given of the quantum-dot cellular automata (QCA) architecture, along with a summary of experimental demonstrations of QCA devices. QCA is a transistorless computation paradigm that can provide a solution to such challenging issues as device and power density. The basic building blocks of the QCA architecture, such as AND, OR gates and clocked cells have been demonstrated and will be presented here. The quantum dots used in the experiments to date are metal islands that are coupled by capacitors and tunnel junctions, and devices operate only at very low temperatures. For QCA to be used in practical devices, the operating temperature must be raised, and issues such as background charge must be addressed. An introduction will be given to these issues and possible solutions.

Realization of quantum-dot cellular automata using semiconductor quantum dots

2003 ◽  
Vol 34 (3-6) ◽  
pp. 195-203 ◽  
Author(s):  
C.G Smith ◽  
S Gardelis ◽  
A.W Rushforth ◽  
R Crook ◽  
J Cooper ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Semiconductor Quantum Dots ◽  
Quantum Dot Cellular Automata

Quantum-Dot Devices and Quantum-Dot Cellular Automata

1997 ◽  
Vol 07 (10) ◽  
pp. 2199-2218 ◽  
Author(s):  
Wolfgang Porod
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Tunnel Junctions ◽  
Boolean Logic ◽  
Quantum Dot Cellular Automata ◽  
Nonlinear Networks ◽  
Binary Information ◽  
Logic Functions ◽  
Theoretic Description

We discuss novel nanoelectronic architecture paradigms based on cells composed of coupled quantum-dots. Boolean logic functions may be implemented in specific arrays of cells representing binary information, the so-called Quantum-Dot Cellular Automata (QCA). Cells may also be viewed as carrying analog information and we outline a network-theoretic description of such Quantum-Dot Nonlinear Networks (Q-CNN). In addition, we discuss possible realizations of these structures in a variety of semiconductor systems (including GaAs/AlGaAs, Si/SiGe, and Si/SiO 2), rings of metallic tunnel junctions, and candidates for molecular implementations.

Design and Electronic Characterization of Bio-Molecular QCA: A First Principle Approach

2017 ◽  
Vol 49 ◽  
pp. 202-214
Author(s):  
Debarati Dey ◽  
Pradipta Roy ◽  
Debashis De
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Thiol Group ◽  
First Principle ◽  
Molecular Device ◽  
Quantum Dot Cellular Automata ◽  
Molecular Quantum Dot ◽  
Null State ◽  
Homo Lumo

Molecular Quantum-dot Cellular Automata is the most promising and challenging technology nowadays for its high operating frequency, extremely high device density and non-cryogenic working temperature. In this paper, we report a First Principle approach based on analytical model of 3-dot Bio Molecular Quantum-dot Cellular Automata. The device is 19.62Å long and this bio molecular Quantum dot Cell has been made with two Adenine Nucleotide bio-molecules along with one Carbazole and one Thiol group. This whole molecular structure is supported onto Gold substrate. In this paper, two Adenine Nucleotides act as two quantum dots and Carbazole acts as another dot. These 3-Quantum-dots are mounted in a tree like structure supported with Thiol group. This model has been demonstrated with Extended Hückel Theory based semi-empirical method. The quantum ballistic transmission and HOMO-LUMO plot support the polarization state change. This state changing ability has been observed for this molecular device. Therefore, this property has been investigated and reported in this paper. HOMO-LUMO plot shows the two logic states along with null state for this 3-dots system. This phenomenon illustrates how the charge transfers take place. Two polarization states along with one additional null state have been obtained for this bio molecular nano device. This molecular device has been operated with 1000THz frequency. This nanoscale design approach will initiate one step towards the modeling of high frequency bio molecular Quantum dot Cell at room temperature.

Asymmetric, mixed-valence molecules for spectroscopic readout of quantum-dot cellular automata

2021 ◽  
Author(s):  
Nishattasnim Liza ◽  
Dylan Murphey ◽  
Peizhong Cong ◽  
David W. Beggs ◽  
Yuihui Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Room Temperature ◽  
Mixed Valence ◽  
The State ◽  
Single Electron ◽  
Double Quantum ◽  
Mobile Charge ◽  
Quantum Dot Cellular Automata

Abstract Mixed-valence compounds may provide molecular devices for an energy-efficient, low-power, general-purpose computing paradigm known as quantum-dot cellular automata (QCA). Multiple redox centers on mixed-valence molecules provide a system of coupled quantum dots. The configuration of mobile charge on a double-quantum-dot (DQD) molecule encodes a bit of classical information robust at room temperature. When arranged in non-homogeneous patterns (circuits) on a substrate, local Coulomb coupling between molecules enables information processing. While single-electron transistors (SETs) and single-electron boxes (SEBs) could provide low-temperature solutions for reading the state of a 1-nm-scale molecule, we propose a room-temperature read-out scheme. Here, DQD molecules are designed with slightly dissimilar quantum dots. Ab initio calculations show that the binary device states of an asymmetric molecule have distinct Raman spectra. Additionally, the dots are similar enough that mobile charge is not trapped on either dot, allowing device switching driven by the charge configuration of a neighbor molecule. A technique such as tip-enhanced Raman spectroscopy (TERS) could be used to detect the state of a circuit comprised of several QCA molecules.

scholarly journals Next Generation Computing Using Quantum Dot Cellular Automata Nano Technology, New Promising Alternative to CMOS

2019 ◽  
Vol 8 (S3) ◽  
pp. 19-24
Author(s):  
Singathala Guru Viswadha
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Building Blocks ◽  
Cmos Technology ◽  
Electronic Interaction ◽  
Physical Point ◽  
Promising Alternative ◽  
Processing Technologies ◽  
Quantum Dot Cellular Automata

CMOS technology is one of the most popular technology in the computer chip design industry and broadly used today to form integrated circuits in numerous and varied applications and it has transformed the field of electronics. Over the time the design methodologies and processing technologies of CMOS devices have greatest activity with the Moore’s law. Now CMOS technology has to face challenges to survive through the submicron ranges. The scaling in CMOS has reached higher limit, not only from technological and Physical point of view but also from economical and material aspects. This concept inspires the researches to look for new alternatives to CMOS which gives better performance and power consumption. One of the alternative technologies to digital designing in CMOS is the Quantum dot Cellular Automata (QCA). QCA is a technology it works on Electronic interaction between the cells. The QCA cell basically consists of Quantum dots separated by certain distance. The transmission of information done via the interaction between the Electrons present in these quantum dots. In this paper the limitations to CMOS in submicron range and concepts for designing in QCA have been discussed and also the building blocks are explained using QCA designer implementations with focus on cell interaction and clocking mechanism.

scholarly journals A Customizable Quantum-Dot Cellular Automata Building Block for the Synthesis of Classical and Reversible Circuits

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Ahmed Moustafa ◽  
Ahmed Younes ◽  
Yasser F. Hassan
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Cell Count ◽  
Building Block ◽  
Digital Logic ◽  
Basic Building Block ◽  
Quantum Dot Cellular Automata ◽  
Binary Operations ◽  
Toffoli Gates

Quantum-dot cellular automata (QCA) are nanoscale digital logic constructs that use electrons in arrays of quantum dots to carry out binary operations. In this paper, a basic building block for QCA will be proposed. The proposed basic building block can be customized to implement classical gates, such as XOR and XNOR gates, and reversible gates, such as CNOT and Toffoli gates, with less cell count and/or better latency than other proposed designs.

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