Single spin universal Boolean logic

Details Single spin universal Boolean logic Single spin universal Boolean logic

2008-01-25

arxiv.org/abs/0801.3979v1

New Journal of Physics, 10 (2008) 015001 [Focus Issue]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1088/1367-2630/10/1/015001

Recent advances in manipulating single electron spins in quantum dots have brought us close to the realization of classical logic gates based on representing binary bits in spin polarizations of single electrons. Here, we show that a linear array of three quantum dots, each containing a single spin polarized electron, and with nearest neighbor exchange coupling, acts as the universal NAND gate. The energy dissipated during switching this gate is the Landauer-Shannon limit of kTln(1/p) [T = ambient temperature and p = intrinsic gate error probability]. With present day technology, p = 1E-9 is achievable above 1 K temperature. Even with this small intrinsic error probability, the energy dissipated during switching the NAND gate is only ~ 21 kT, while today's nanoscale transistors dissipate about 40,000 - 50,000 kT when they switch.

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