quantum dot cellular automata - ucsb
TRANSCRIPT
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Quantum‐Dot Cellular Automata
M i fMain reference:
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QCA ‐main ideaQCA main idea
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QCA devicesQCA devices
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QCA full adderQCA full adder
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One of the challenges: Kink energyOne of the challenges: Kink energy
Kink energy should be >> KbTshould be KbT
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QCA implementation
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Metal‐dot QCA cells and devicesMetal dot QCA cells and devices
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Metal‐dot QCA cells and devicesMetal dot QCA cells and devices
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Clocked QCA cells (Lent design)Clocked QCA cells (Lent design)
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Clocked QCA cells (Likharev design)Clocked QCA cells (Likharev design)
K. K. Likharev and A. N. Korotkov, Science 273. (1996) 763‐765
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Three‐dot QCA latch operationThree dot QCA latch operation
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QCA shift register
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QCA shift registerQCA shift register
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Adiabatic clocking in QCAAdiabatic clocking in QCA
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Two schemes (similar to CMOS l k )clocking)
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Molecular QCAMolecular QCA
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Molecular QCA clockingMolecular QCA clocking
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Magnetic QCAMagnetic QCA
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QCA problems ‐ 1QCA problems 1
• Wire crossingsWire crossings
• Communication is computation
i f ? Superior performance?
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QCA problems ‐ 2
• Critical dimension variations or low T (could be solve with large redundancy)be solve with large redundancy)
Superior performance?