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QCA2 - tunneling ◦ room temperature QCA Fabrication...

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Emerging Technologies of  Computation Montek Singh COMP790-084 Aug 30, 2011
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Gain/amplification restoring logic clock gain QCA Implementation Experimental results Today:  Quantum Dot Cellular  Automata (part 2)
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What is gain/amplification? Why is gain important in digital systems? Gain in QCA small electrostatic force tips electron over clocking provides further amplification Gain/amplification in QCA
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QCA clocking “freeze” cell when clock low equivalent to latching free it up when clock high equivalent to computing QCA clocking Often use 4 or  more clock phases
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Metal-island aluminum dots 1 micron, so very low temperatures Semiconductor 20-50 nm, so still very low temperatures most common Molecular single molecules, so very fast future, not yet Magnetic magnetic exchange interactions instead of electron 
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Unformatted text preview: tunneling ◦ room temperature QCA: Fabrication Al-AlOx-Al type ◦ Aluminum dots ◦ Aluminum Oxide barriers ◦ fabricated on Silicon substrate ◦ using electron beam lithography Example: Notre Dame group QCA: Semiconductor type Notre Dame group 6-dot cell ◦ D1-D4 are two double-dots for QCA ◦ E1-E2 are electrometers for reading out Experimental results Majority-gate experiment ◦ V1-V4 “simulate” inputs A, B and C ◦ Electrometers read output Experimental results Experimental results Experimental results For clearer separation between output ‘1’ and ‘0’, we need ◦ lower temperatures (70mK) ◦ or, smaller capacitances (molecular-scale sizes) Practical considerations...
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