Quantum Cellular Automata: Theory, Experimentation and by Massimo Macucci PDF

By Massimo Macucci

ISBN-10: 1860946321

ISBN-13: 9781860946325

The Quantum mobile Automaton (QCA) suggestion represents an try and become independent from from the conventional three-terminal gadget paradigm that has ruled electronic computation. for the reason that its early formula in 1993 at Notre Dame college, the QCA notion has acquired major consciousness and a number of other actual implementations were proposed. This ebook presents a complete dialogue of the simulation techniques and the experimental paintings which have been undertaken at the fabrication of units able to demonstrating the basics of QCA motion. Complementary perspectives of destiny views for QCA know-how are offered, highlighting a means of life like simulation and of exact experiments that may be assumed as a version for the review of destiny gadget proposals.

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Here ce is the etching depth (~ 2 to 5 nm in the experiment). To define the mapping it is convenient to introduce two complex planes, one where the complex variable is ze = xe + iye, which is 34 J. Martorell, D. W. L. Sprung, M. Girlanda, and M. Macucci mapped onto a second plane, the z plane, where we write z = x + iy. The profile of the etched surface is defined by the following points (which are the vertices of an open Schwarz Christoffel (SC) polygon that will be used for the conformal mapping): tu0 = —oo+iO, w\ = —W/2+iO, 102 = —W/2+ice, W3 = +W/2 + ice , w4 = +W/2 + iO and w$ — +00 + iO.

The reason for this apparent contrast lies in the fact that we should instead compare the variation in the confinement energy and the energy separation between the two polarization configurations, which is very small. In Fig. 94/ S3 CD > •c p -" - 1 "i 1 1 , ~ i 0 Driver cell polarization 1 Fig. 1. Polarization of the driven cell P i versus the polarization of the driver cell P2 as a function of the driver cell asymmetry. 0 5d/d (10 _ 3 ) 4 Fig. 2. Shift of the zero of polarization P i (threshold for switching) as a function of the driver cell asymmetry.

4. Gate layout for the definition of a four-dot cell in the 2-dimensional gas obtained by modulation doping in a heterostructure. 42 J. Martorell, D. W. L. Sprung, M. Girlanda, and M. Macucci We compute the cell-to-cell response function for a few values of the 2DEG depth and report the results in Fig. 5 V. The driver cell is assumed to be fully polarized, located at a distance of 400 nm (distance between cell centers) from the cell being considered. It is apparent that the cell-to-cell response gets smoother as the depth of the 2DEG is increased: this does not come as a surprise, since, as the 2DEG gets further from the gate, the depth of the potential dips representing the dots decreases, thus the barriers seen by the electrons between the dots are lowered, and therefore a smoother transition of charge is expected to take place, as discussed in the previous chapter.

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Quantum Cellular Automata: Theory, Experimentation and Prospects by Massimo Macucci


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