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- W3149805571 abstract "Quantum-dot cellular automata (QCA) is a new computation paradigm which encodes bit information by charge configurations. No current flows through the cells; only Coulomb interaction contributes to the computation. Power dissipation has become an important issue in nanotechnology because of the high densities in nano-devices. The chip will melt unless the device dissipates only a small amount of energy to the environment. Landauer [l] has proposed an adiabatic switching method, which has been applied widely in clocked QCA cells [2]. Gradual clocking insures the cells always in the instantaneous ground state, which can provide arbitrarily low power dissipation if the switching process is slow enough. Non-dissipative computation can be achieved by keeping a copy to the bits that are going to be erased [2]. Bennett pointed out that any computation could be rendered into reversible format by accumulating a history of all information that would normally thrown away, then disposing this history by the reverse of the process that created it [3]. In this paper, we employ the Bennett clocking design in QCA circuits, which clocks the circuit forward through the cell array and then retreats the clock in a backward sequence. In conventional CMOS considerable overhead in circuit complexity is required to achieve Bennett clocking. In QCA by contrast, no additional circuit complexity is requiredonly a different clock signal. We show by direct calculation of the equations of motion for a QCA system that energy dissipation less than ksTlog(2) is possible for logically irreversible systems using the Bennett clocking approach." @default.
- W3149805571 created "2021-04-13" @default.
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- W3149805571 date "2004-01-01" @default.
- W3149805571 modified "2023-09-24" @default.
- W3149805571 title "Bennett and Landauer clocking in quantum-dot cellular automata" @default.
- W3149805571 hasPublicationYear "2004" @default.
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