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