Integrated Nanoelectronics pp 323-339 | Cite as

# Quantum Dot Cellular Automata (QDCA)

## Abstract

For representation of binary information and performing computations on them, cells containing quantum dots at defined locations are used. Tunnel barriers separate the neighboring dots. Under the control of a back plane voltage , electrons can tunnel between dots. But intercell barriers strictly prevent tunneling of electrons across cells. Information is encoded in the form of positions of electrons in the cell. Electrons in each cell interact Coulombically. The cells are also coupled through Coulomb forces between electrons. The utilization of QDCA as a wire, as a majority voter, and for performing logic AND/OR operations is explained. Salient features and applications of the QDCA approach are described. The quantum dot-based architecture is experimentally proven to work in the mKelvin temperature range. This field-coupled nanocomputing model is likely to challenge and succeed the CMOS for room-temperature operation when technological capability develops to the level of easily fabricating quantum dots of molecular size.

## Keywords

Input Signal Polarization State Truth Table Clock Signal Tunnel Barrier## References

- 1.Tougaw PD, Lent CS (1994) Logical devices implemented using quantum cellular automata. J Appl Phys 75(3):1818–1825CrossRefGoogle Scholar
- 2.Snider GL, Orlov AO, Amlani I et al (1999) Quantum-dot cellular automata. J Vac Sci Technol A 17(4):1394–1398CrossRefGoogle Scholar
- 3.Tougaw D (2014) A clocking strategy for scalable and fault-tolerant QDCA signal distribution in combinational and sequential devices. In: Anderson NG, Bhanja S (eds) Field-coupled nanocomputing. Springer, Berlin, Heidelberg, pp 61–72Google Scholar
- 4.Mustafa M, Beigh MR (2013) Design and implementation of quantum cellular automata based novel parity generator and checker circuits with minimum complexity and cell count. Indian J Pure Appl Phys 51:60–66Google Scholar
- 5.Orlov AO, Amlani I, Bernstein HG et al (1997) Realization of a functional cell for quantum-dot cellular automata. Science 277:928–930CrossRefGoogle Scholar
- 6.Amlani I, Orlov AO, Toth G (1999) Digital logic gate using quantum-dot cellular automata. Science 284:289–291CrossRefGoogle Scholar