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Solid-state based coupled electron waveguide (CEW) is one of the suggested approaches to realize a Qubit for futuristic quantum computing purposes. Its functionality is based on coherent switching and superposition of electron wavefunction over two coupled quantum wires. Conceptually it is the simplest approach (relatively), however there are a multitude of effects which interfere with the actual...
We perform numerical simulations of the switching characteristics of coupled quantum wires with different potential profiles. Our calculations reveal a reduced efficiency of switching between the wires, when their profile is close to that expected for an experimental implementation of the system. We also demonstrate a novel manifestation of electron-stub-tuner behavior in a slightly asymmetric configuration...
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