Clocked molecular quantum-dot cellular automata circuits tolerate unwanted external electric fields

Quantum-dot cellular automata (QCA) may provide low-power, general-purpose computing in the post-CMOS era. A molecular implementation of QCA features nanometer-scale devices and support THz switching speeds at room-temperature. Here, we explore ability circuits to tolerate unwanted applied electric fields, which come from a variety sources. One likely source strong fields be electrodes recently proposed for write-in classical bits input circuits. Previous models have shown that are sensitive field, coupled wire can successfully transfer bit downstream despite fields. However, other an field has not yet been demonstrated. Here study robustness various by calculating their ground state responses presence field. To do this, circuit is built several molecules, each described as two-state system. Hamiltonian formed diagonalized. All pairwise interactions between cells considered, along with all correlations. An examination shows these indeed We also show immunity dominant component obtained choosing orientation constituent molecules. This suggests relatively large used need disrupt operation nearby The significant sources, well.